Download (Updated) Java Lab Manual

CHATANYA BHARATHI INSTITUTE OF TECHNOLOGY
Object Oriented Programming Through Java Lab Record
For
I Yr. MCA II Semester
Compiled by Mrs. G.KALPANA, Asst.Professor in MCA Department
2014-2015
[Pick the date]
Department of MASTER OF COMPUTER APPLICATIONS
Chaitanya Bharathi Institute of Technology (Autonomous)
Gandipet, Hyderabad-75.
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
Object Oriented Programming Through Java Laboratory Record
INDEX
S.NO
I
PROGRAMME NAME
Basic Programs
4
1)Write java program to print Biggest of 3 Numbers using Logical Operators
4
2) write a java program to print first 10 numbers in fibonacci series
5
3) Write a java program to print Factorial of a given number
6
4)Write java program to print the following o/p
5) Write a java program to print sum of Sum of Digits
II
III
P.NO.
7
8
6) Write a java Program for swapping two numbers
9
7)Wrte a java program to print primes up to the given prime number
10
8) Write java program to check given string is a palindrome or not
11
9) wajp to print sum of n terms in the series 1/1! +1/2!+1/3!.....
12
10) Write A Java Program to print Quadratic roots using command line
arguments
13
11) Write a java program to print the names in sorted order using arrays
14
12) Write a java program to print multiplication table using arrays
15
Method Overloading
18
1)Write a java program to demonstrate method overloading
18
2)Write a java program to find the volume of a Box using method
overloading with different number of perameters.
19
Constructor overloading :
22
1) Write a java program to illustrate the concept of constructors and its
overloading.
22
2) Write a java program for Rectangle class using constructor overloading
with different no. of parameter list
24
3) Wajp to copy the values of one object into another using constructor.
26
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
1
Object Oriented Programming Through Java Laboratory Record
S.NO
IV
V
VI
VII
VIII
IX
X
PROGRAMME NAME
P.NO
Inheritence
28
1) Wajp for Rectange class using Simple Inheritance
28
2) Write a Java program to demonstrate multilevel inheritance.
30
3) Write a Java program to implement the following hierarchy and find area
and perimeter Abstract
31
Method Overriding
35
1)Write a java program for Bank class using Method Overriding.
36
2) Write a java program to demonstrate Method overriding (use super
keyword)
38
Dynamic Method Dispatch
39
1)Write a Java program to demonstrate dynamic dispatch.
40
2) Wajp for Bank class using Dynamic Method Dispatch
41
Abstract Class:
43
1) Write a Java program to implement a Vehicle Abstract class.
43
2)Wajp to demonstrate the concept of abstract class
46
Packages:
48
1)Write a Java program to demonstrate use of user defined packages.
49
2) write a java package for book class and then import and display the
result.
50
3) write a java program to find the cube of a number for various data types
using package and then import and display the results.
51
Interfaces:
53
1) Write a Java program to illustrate the multiple inheritance by using
Interfaces.
53
Super , Static, final key words :
56
1)Write a java program to illustrate the keywords i)super ii)static iii)final
56
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
2
Object Oriented Programming Through Java Laboratory Record
S.NO
XI
PROGRAMME NAME
P.NO
Exception handling:
57
1)wajp to demonstrate simple example for exception handling
57
2)Wajp to demonstrate exception handling with multiple catch blocks
58
3) wajp using NumberFormat exception
60
4)Wajp for user defined exception
61
XII
How to make executable jar files in JDK1.3.1?
63
XIII
Multithreading
64
1) Write a Java program to demonstrate the concept of daemon threads
64
2) Write a Java program to demonstrate the concept of synchronization by
suitable example
66
3) Write a Java program to demonstrate the concept of Inter thread
communication by Suitable example
68
4) Write a program to demonstrate string tokenizer.
70
File I/O and Streams
73
1)Wajp to Demonstration of FileOutputStream and PrintStream classes
74
2) Write a java program to Write bytes to a file
75
3) Write a java program to copy bytes from one file to another.
76
Applets
79
1) Wajp for Sum of Two Numbers using Applet
79
2)Wajp for Applet using drawstring(), drawRect() and drawOval()
80
3) Write a Java program to demonstrate banner applet.
81
4) wajp for Bouncing of a Ball using applet
83
XIV)
XV
XIV
AWT: 1 ) Wajp that prints a message by clicking on the button using AWT
2) Wajp to demonstrate Grid Layout manager using AWT
3) GUI with controls menus and event handling using SWING
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
87
3
Object Oriented Programming Through Java Laboratory Record
Java lab programmes
I. Basic programs:
1) Write java program to print Biggest of 3 Numbers using Logical Operators
Importjava.util.*;
class Biggest3
{
public static void main(String args[])
{
int n1, n2, n3, big;
Scanner scan= new Scanner(System.in);
System.out.print("Please Enter No 1: ");
n1=scan.nextInt();
System.out.print("Please Enter No 2: ");
n2=scan.nextInt();
System.out.print("Please Enter No 3: ");
n3=scan.nextInt();
if(n1>n2 && n1>n3)
big=n1;
else if(n2>n1 && n2>n3)
big=n2;
else
big=n3;
System.out.println("Biggest No: " + big);
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
4
Object Oriented Programming Through Java Laboratory Record
}
O/P:
2) write a java program to print first 10 numbers in fibonacci series
classFibo
{
public static void main(String args[])
{
inta,b,temp,n;
a=0;
b=1;
for(n=1;n<=10;n++)
{
System.out.println(a);
temp=a+b;
a=b;
b=temp;
}
}
}s
o/p :
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
5
Object Oriented Programming Through Java Laboratory Record
3) Write a java program to print Factorial of a given number
Importjava.util.*;
class Factorial
{
public static void main(String args[])
{
int n, i, fact=1;
Scanner scan= new Scanner(System.in);
System.out.print("Please Enter a No.");
n=scan.nextInt();
for(i=n;i>=1;i--)
{
fact=fact*i ;
}
System.out.println("Factorial of " + n + " is " + fact);
}
}
O/P:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
6
Object Oriented Programming Through Java Laboratory Record
4)Write java program to print the following o/p
Following star pattern is printed
*
**
***
****
*****
class Stars
{
Public static voidmain(String[]args)
{
int row, numberOfStars;
for(row =1; row <=10; row++)
{
for(numberOfStars=1;numberOfStars<=row;
numberOfStars++)
{
System.out.print("*");
}
System.out.println();// Go to next line
}
}
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
7
Object Oriented Programming Through Java Laboratory Record
Output of program:
5) Write a java program to print sum of Sum of Digits
Logic: 513 -> 5+1+3=9
n
res
n
sum
513
513%10
0
3
513/10
51%10
51
1
51/10
5%10
3
4
5
5
5/10
3
4
9
0
9
importjava.util.*;
classSumDigits
{
public static void main(String args[])
{
int n, res,sum=0;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
8
Object Oriented Programming Through Java Laboratory Record
Scanner scan= new Scanner(System.in);
System.out.print("Please Enter No. = ");
n=scan.nextInt();
System.out.print("Sum of digits of a number" +n+ "is = ");
{
res=n%10;
n=n/10;
sum=sum+res;
}
System.out.print(+sum);
while(n>0)
}
}
o/p:
6) Write a java Program for swapping two numbers
importjava.util.*;
class Swap
{
public static void main(String args[])
{
int n1, n2, temp;
Scanner scan= new Scanner(System.in);
System.out.print("Please Enter No 1:=");
n1=scan.nextInt();
System.out.print("Please Enter No 2: =");
n2=scan.nextInt();
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
9
Object Oriented Programming Through Java Laboratory Record
temp=n1;
n1=n2;
n2=temp;
System.out.println("First No: " + n1);
System.out.println("Second No: " + n2);
}
}
o/p:
7)Wrte a java program to print primes up to the given prime number
importjava.util.*;
public class Prime
{
public static void main(String args[])
{
inti,j,p=1;
Scanner sc =new Scanner(System.in);
System.out.print("enter a number up to which u want print primes =");
int n=sc.nextInt();
for(i=2;i<=n;i++)
{
p=1;
for(j=2;j<i;j++)
{
if(i%j==0)
{
p=0;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
10
Object Oriented Programming Through Java Laboratory Record
}}
if(p==1)
System.out.println(j);
}
}
}
o/p:
8) Write java program to check given string is a palindrome or not
importjava.util.*;
public class Palin
{
public static void main(String args[])
{
System.out.print("enter strings = ");
Scanner sc=new Scanner(System.in);
String s=sc.next();
StringBuffer tmp=new StringBuffer(s);
tmp.reverse();
String str2;
str2=new String(tmp);
if(s.equals(str2))
System.out.println("the given string " + s + " is palindrome");
else
System.out.println("the given string " + s + " is not palindrome");
}
}
O/P:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
11
Object Oriented Programming Through Java Laboratory Record
9) wajp to print sum of n terms in the series 1/1! +1/2!+1/3!.....
importjava.util.Scanner;
classSeriesfact
{
public static void main(String args[])
{
int i;
float sum=0,f=1;
System.out.println("enter number of terms in the series");
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
for(i=1;i<=n;i++)
{
for(f=1;f<=i;f++)
{
f=f*i;
sum=sum + (float)1/f;
}
}
System.out.println("sum of" +n +"terms is = " +sum);
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
12
Object Oriented Programming Through Java Laboratory Record
10) Write A Java Program to print Quadratic roots using command line arguments
importjava.lang.*;
class Quadratic
{
public static void main(String args[])
{
inta,b,c,d;
double r1,r2;
a=Integer.parseInt(args[0]);
b=Integer.parseInt(args[1]);
c=Integer.parseInt(args[2]);
d=b*b-4*a*c;
if(d==0)
{
r1=r2=-(float)b/(2*a);
System.out.println("the roots are real equal =" +r1 + " and r2 = " +r2);
}
else if(d>0)
{
double t=Math.sqrt(d);
r1=(-b+t)/(2*a);
r2=(+b+t)/(2*a);
System.out.println("the roots are real and distict \n r=" +r1 +" and r2=" +r2);
}
else if(d<0)
{
System.out.println("the roots are imaginary and there is no real solution ");
}
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
13
Object Oriented Programming Through Java Laboratory Record
11) Write a java program to print the names in sorted order using arrays
import java.lang.*;
class Stringsort
{
static String name[]={"Bombay" , "Madras" ,"Delhi" ,"Pune"};
public static void main(String args[])
{
int size=name.length;
String temp=null;
for(int i=0;i<size;i++)
{
for(int j=i+1;j<size;j++)
{
if ( name[j].compareTo(name[i])<0)
{
temp=name[i];
name[i]=name[j];
name[j]=temp;
}
}
}
System.out.println("soted names are ");
for(int i=0;i<size;i++)
{
System.out.println(name[i]);
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
14
Object Oriented Programming Through Java Laboratory Record
}
}
o/p
12) Write a java program to print multiplication table using arrays
import java.util.Scanner;
import java.io.*;
import java.lang.*;
class MatrixMul
{
public static void main(String[] args)
{
int i= 0,j=0,k=0,p,q,m,n;
int a[][] = new int[10][10];
int b[][] = new int[10][10],c[][] = new int[10][10];
Scanner sc = new Scanner(System.in);
System.out.print("Enter no of rows in the A matrix= ");
p=sc.nextInt();
System.out.print("Enter a no of columns in the A matrix = ");
q=sc.nextInt();
System.out.print("Enter no of rows in the B matrix= ");
m = sc.nextInt();
System.out.print("Enter no of columns in the B matrix= ");
n = sc.nextInt();
if(q==m)
{
System.out.print ("Enter A matrix values :");
for(i=0;i<p;i++)
{
for(j=0; j<q ;j++)
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
15
Object Oriented Programming Through Java Laboratory Record
a[i][j] = sc.nextInt() ;
}
}
System.out.println("\nMatrix A values are ");
for(i=0;i<p;i++)
{
for(j=0;j<q;j++)
{
System.out.print(" "+a[i][j]) ;
}
System.out.println();
}
System.out.println("Enter matrxi B values :");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
b[i][j] = sc.nextInt() ;
}
}
System.out.println("\nMatrix B values ");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
System.out.print(" "+b[i][j]) ;
}
System.out.println();
}
System.out.println("\n C Matrix is C = A * B Result");
if(q == m)
{
for(i=0;i<p;i++)
{
for(j=0;j<n;j++)
{
c[i][j]= 0 ;
for(k=0;k<q;k++)
{
c[i][j] = c[i][j] + (a[i][k] * b[k][j]) ;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
16
Object Oriented Programming Through Java Laboratory Record
}
}
}
}
// for C matrix Printing
for(i=0;i<p;i++)
{
for(j=0;j<n;j++)
{
System.out.print(" "+c[i][j]) ;
}
System.out.println();
}
}else
{
System.out.println("Matrix multiplication not possible");
}
}
}
O/P:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
17
Object Oriented Programming Through Java Laboratory Record
II. Method Overloading
Method overloading means when two or more methods have the same name but a different
signature. Signature of a method is nothing but a combination of its name and the sequence of
its parameter types.
1) Write a java program to demonstrate method overloading
Program:
class OverloadDemo
{
void max(float a, float b)
{
System.out.println("\nmax method with float argument invoked");
if(a>b)
System.out.println(a+" is Greater");
else
System.out.println(b+" is Greater");
}
void max(double a, double b)
{
System.out.println("max method with double arg invoked");
if(a>b)
System.out.println(a+" a is Greater");
else
System.out.println(b+" b is Greater");
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
18
Object Oriented Programming Through Java Laboratory Record
max(long a, long b)
{
System.out.println("\nmax method with long arg invoked");
if(a>b)
System.out.println(a+" a is Greater");
else System.out.println(b+" b is Greater");
}
public static void main(String[] args)
{
OverloadDemo o=new OverloadDemo();
o.max(23L,12L);
o.max(2,3);
o.max(54.0,35f);
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
19
Object Oriented Programming Through Java Laboratory Record
2)Write a java program to find the volume of a Box using method overloading with
different number of perameters.
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
20
Object Oriented Programming Through Java Laboratory Record
class Box
{
int width,breadth,height;
void getdata(int length)
{
width=breadth=height=length;
}
void getdata(int a,int b)
{
width=a;
breadth=height=b;
}
void getdata(int x,int y, int z)
{
width=x;
breadth=y;
height=z;
}
int volume()
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
21
Object Oriented Programming Through Java Laboratory Record
{
System.out.println(" ");
return width*breadth*height;
}}
class MainBox
{
public static void main(String args[])
{
int vol;
Box mybox1=new Box();
Box mybox2=new Box();
Box mybox3=new Box();
mybox1.getdata(10,20,30);
vol=mybox1.volume();
System.out.println("volume of my box with 3 perameters is = " +vol);
mybox2.getdata(10,20);
vol=mybox2.volume();
System.out.println("volume of my box with 2 perameters is = " +vol);
mybox3.getdata(5);
vol=mybox3.volume();
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
22
Object Oriented Programming Through Java Laboratory Record
System.out.println("volume of my box with 1 perameter is = " +vol);
}
}
o/p:
III. Constructor overloading :
Constructor is a special type of method which is having the same class name that is used to
initialize the object. Constructor is invoked at the time of object creation.
Constructor overloading is a technique in Java in which a class can have any number of
constructors that differ in parameter lists. The compiler differentiates these constructors by
taking into account the number of parameters in the list and their type.
1) Write a java program to illustrate the concept of constructors and its overloading.
import java.lang.*;
class TestOl
{
int hrs,mins,scnds;
TestOl(int h,int m,int s)
{
hrs=h;
mins=m;
scnds=s;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
23
Object Oriented Programming Through Java Laboratory Record
}
public TestOl(int h)
{
hrs=h;
mins=0;
scnds=0;
}
public TestOl(int h,int m)
{
hrs=h;
mins=m;
scnds=0;
}
public TestOl()
{
hrs=0;
mins=0;
scnds=0;
}
void primetime()
{
System.out.println("hrs:"+hrs+"\t mins:"+mins+"\t scnds:"+scnds);
}
}
class OverLoad
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
24
Object Oriented Programming Through Java Laboratory Record
public static void main(String args[])
{
TestOl obj1=new TestOl();
obj1.primetime();
TestOl obj2=new TestOl(5);
obj2.primetime();
TestOl obj3=new TestOl(7,6);
obj3.primetime();
}}
O/P:
2) Write a java program for Rectangle class using constructor overloading with different no.
of parameter list
class Rectangle
{
int length;
int width;
int area()
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
25
Object Oriented Programming Through Java Laboratory Record
return length*width;
}
void perimeter()
{
int p=2*length+2*width;
System.out.println("perimeter of rectangle is " +p);
}
Rectangle()
{
length=10;
width=10;
}
Rectangle(int a)
{
length=width=a;
}
Rectangle(int a, int b)
{
length=a;
width=b;
}
}
class MainForRectangle
{
public static void main(String args[])
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
26
Object Oriented Programming Through Java Laboratory Record
Rectangle r1= new Rectangle();
r1.length=5;
r1.width=5;
Rectangle r2=new Rectangle(10);
Rectangle r3=new Rectangle(20,10);
System.out.println(" ");
r1.perimeter();
r2.perimeter();
r3.perimeter();
float area1= r1.area();
float area2=r2.area();
System.out.println(" ");
System.out.println("area of Rectangle 1 and 2 are " +area1+", " +area2);
System.out.println("area of Rectangle objcet3 is" +r3.area());
}
}
O/P:
3) Wajp to copy the values of one object into another using constructor.
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
27
Object Oriented Programming Through Java Laboratory Record
class Student
{
int id;
String name;
int age;
Student(int i,String n,int a)
{
id = i;
name = n;
age=a;
}
Student(Student s)
{
id = s.id;
name =s.name;
age=s.age;
}
void display()
{
System.out.println(id+" "+name+" "+age);
}
public static void main(String args[])
{
Student s1 = new Student(111,"Kalpana",39);
Student s2 = new Student(s1);
Faculty name : G.kalpana
//copy contents from s1 in to s2
Course: M.C.A
Year/Sem : I st year /2nd sem
28
Object Oriented Programming Through Java Laboratory Record
s1.display();
s2.display();
}
}
o/p:
IV) Inheritance is a mechanism in which one object acquires all the properties and behaviours
of parent object.
The following kinds of inheritance are there in java.



Simple Inheritance : When a subclass is derived simply from it's parent class then this
mechanism is known as simple inheritance.
Multilevel Inheritance: When a subclass is derived from a derived class then this
mechanism is known as the multilevel inheritance
Multiple Inheritance is achieved in java by using Interfaces.
1) Wajp for Rectange class using Simple Inheritance
class Rectangle
{
int length;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
29
Object Oriented Programming Through Java Laboratory Record
int width;
void area()
{
System.out.println("area of Rectangle is " +(length*width));
}
}
class Cuboid extends Rectangle
{
int height;
void volume()
{
System.out.println("Volume of cuboid is " +(length*width*height));
}
}
class Simpleinheritance1
{
public static void main(String args[])
{
Rectangle r=new Rectangle();
Cuboid c=new Cuboid();
r.length=10;
r.width=5;
r.area();
c.length=15;
c.width=10;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
30
Object Oriented Programming Through Java Laboratory Record
c.height=5;
c.volume();
}
}
o/p:
2) Write a Java program to demonstrate multilevel inheritance.
class Name
{
String name="swathi";
int age=20;
}
class Mark extends Name
{
int m1=30,m2=30,m3=30;
}
class Student extends Mark
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
31
Object Oriented Programming Through Java Laboratory Record
int total;
void calc()
{
total=m1+m2+m3;
}
void show()
{
System.out.println("\n NAME: " +name+"\n AGE:"+age+"\n MARK1="+m1+"\n MARK2="
+m2+"\n MARK3="+m3+"\n TOTAL:"+total);
}
}
class MultilevelInheritence
{
public static void main(String args[])
{
Student ob=new Student();
ob.calc();
ob.show();
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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3) Write a Java program to implement the following hierarchy and find area and perimeter
Abstract
abstract class shape
{
abstract double calcar();
abstract double calcper();
abstract void display();
};
class circle extends shape
{
double r;
circle(double a)
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
{
r=a;
}
void display()
{
System.out.println("\nradius="+r);
}
double calcar()
{
double arc=(3.14*r*r);
return arc;
}
double calcper()
{
double per=(2*3.14*r);
return per;
}}
class square extends shape
{
double a;
square(double s)
{
a=s;
}
void display()
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
System.out.println("\nside="+a);
}
double calcar()
{
double ars=a*a;
return ars;
}
double calcper()
{
double per=2*a;
return per;
}}
class triangle extends shape
{
double b,h;
triangle(double p, double q)
{
b=p; h=q;
}
void display()
{
System.out.println("\nbreadth="+b+"\t height="+h);
}
double calcar()
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
double art=(0.5*b*h);
return art;
}
double calcper()
{
return 0;
} };
class Classhierarchy
{
public static void main(String s[])
{
circle c=new circle(5.2f);
c.display();
System.out.println("\nArea of circle ="+c.calcar());
System.out.println("\nPerimeter of circle ="+c.calcper());
square sq=new square(2.3f);
sq.display();
System.out.println("\nArea of square ="+sq.calcar());
System.out.println("\nPerimeter of square ="+sq.calcper());
triangle t=new triangle(1.3f,4.5f);
t.display();
System.out.println("\nArea of triangle ="+t.calcar());
}}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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o/p:
V) Method Overriding: When there are two methods with same name and prototypes in super
class and subclass then it is called Method overriding.
Advantages of Java Method Overriding:


Method Overriding is used to provide specific implementation of a method that is
already provided by its super class.
Method Overriding is used for Runtime Polymorphism
1)Write a java program for Bank class using Method Overriding.
class Bank
{
int getRateOfInterest()
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
{
return 0;
}
}
class SBI extends Bank{
int getRateOfInterest()
{
return 8;
}
}
class ICICI extends Bank
{
int getRateOfInterest()
{
return 7;
}
}
class AXIS extends Bank
{
int getRateOfInterest()
{
return 9;
}
}
class Test{
public static void main(String args[]){
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
SBI s=new SBI();
ICICI i=new ICICI();
AXIS a=new AXIS();
System.out.println("SBI Rate of Interest: "+s.getRateOfInterest());
System.out.println("ICICI Rate of Interest: "+i.getRateOfInterest());
System.out.println("AXIS Rate of Interest: "+a.getRateOfInterest());
}
}
o/p:
2) Write a java program to demonstrate Method overriding (use super keyword)
class Sup
{
int x;
Sup (int x) //constructor
{
this.x=x;
}
void display()
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
39
Object Oriented Programming Through Java Laboratory Record
System.out.println("x in Super= "+x);
}}
class sub extends Sup
{
int y;
sub(int x,int y)
{
super(x);
this.y=y;
}
void display()
{
System.out.println("\nX in Super Class="+x);
System.out.println("Y in Sub Class="+y);
}}
class TestOverride
{
public static void main(String naren[])
{
sub obj=new sub(100,200);
obj.display();
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
40
Object Oriented Programming Through Java Laboratory Record
VI) Runtime polymorphism or Dynamic Method Dispatch is a process in which a call to an
overridden method is resolved at runtime rather than compile-time.
In this process, an overridden method is called through the reference variable of a superclass.
The determination of the method to be called is based on the object being referred to by the
reference variable.
1)Write a Java program to demonstrate dynamic dispatch.
Program:
abstract class Shape
{
protected final static double PI = 22.0/7.0;
protected double length;
public abstract double area();
}
class Square extends Shape
{
Square(double side)
{
length=side;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
}
public double area()
{
return length*length;
}}
class Circle extends Shape
{
Circle(double radius)
{
length=radius;
}
public double area()
{
return PI*length*length;
}}
public class DynamicDispatch
{
public static void main(String[] args)
{
Shape sh;
Square sq = new Square(10.0);
Circle circ = new Circle(10.0);
sh=sq;
System.out.println("\n Area of Square = " + sh.area());
sh=circ;
System.out.println("Area of circle = " + sh.area());
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
}}
o/p:
2) Wajp for Bank class using Dynamic Method Dispatch
class Bank
{
int getRateOfInterest()
{
return 0;
}
}
class SBI extends Bank{
int getRateOfInterest()
{
return 8;
}
}
class ICICI extends Bank
{
int getRateOfInterest()
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
{
return 7;
}
}
class AXIS extends Bank
{
int getRateOfInterest()
{
return 9;
}
}
class DynamicDispatch{
public static void main(String args[]){
Bank b1=new SBI();
Bank b2=new ICICI();
Bank b3=new AXIS();
System.out.println("SBI Rate of Interest: "+b1.getRateOfInterest());
System.out.println("ICICI Rate of Interest: "+b2.getRateOfInterest());
System.out.println("AXIS Rate of Interest: "+b3.getRateOfInterest());
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
44
Object Oriented Programming Through Java Laboratory Record
VII) Abstract Class: Abstraction is the mechanism of exhibiting the necessary things by
hiding the unnecessary things.
An abstract class is a class that may have at least one abstract method.(ie without body)
we cannot create an object for abstract class. Abstract class may have reference
variables but may not have memory for it.
1) Write a Java program to implement a Vehicle Abstract class.
/* Write a Java program to implement an Vehicle Abstract class.*/
abstract class Vehicle
{
public abstract void wheels();
public abstract void seating();
public abstract void brakes();
}
class Car extends Vehicle
{
public void wheels()
{
System.out.println("\nCar Has Four Wheels");
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
45
Object Oriented Programming Through Java Laboratory Record
public void seating()
{
System.out.println("Car Has Four Seating Capacity");
}
public void brakes()
{
System.out.println("Car Has Power Brakes\n");
}}
class Bike extends Vehicle
{
public void wheels()
{
System.out.println("Bike Has Two Wheels");
}
public void seating()
{
System.out.println("Bike Has Two Seating Capacity");
}
public void brakes()
{
System.out.println("Bike Has Disk Brakes");
}}
class VehicleDemo
{
public static void main(String args[])
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
46
Object Oriented Programming Through Java Laboratory Record
Vehicle v=new Car();
Vehicle v1=new Bike();
v.wheels();
v.seating();
v.brakes();
v1.wheels();
v1.seating();
v1.brakes();
}}
o/p:
2)Wajp to demonstrate the concept of abstract class
abstract class Shape
{
int length;
int width;
Shape(int a, int width)
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
length=a;
this.width=width;
}
abstract void area();
}
class Rectangle extends Shape
{
Rectangle(int length, int width)
{
super(length,width);
}
void area()
{
System.out.println("area of reactange is " +(length*width));
}
}
class Cuboid extends Shape
{
int height;
Cuboid(int length, int width, int height)
{
super(length,width);
this.height=height;
}
void area()
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
System.out.println("Surface area of cuboid is "
+(2*length*width+2*width*height+2*height*length));
}
void volume()
{
System.out.println("volume of cuboid is"+(length*width*height));
}
}
class Mainforshape
{
public static void main(String args[])
{
Rectangle r=new Rectangle(10,20);
r.area();
Cuboid c=new Cuboid(5,10,15);
c.area();
c.volume();
Shape s;
s=r;
s.area();
s=c;
s.area();
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
49
Object Oriented Programming Through Java Laboratory Record
VIII) Packages:
A package is a group of similar types of classes, interfaces and sub-packages.
Package can be categorized in two form, built-in package and user-defined package.
Advantage of Package :

Package is used to categorize the classes and interfaces so that they can be easily
maintained.
Package provids access protection.
Package removes naming collision.


1)Write a Java program to demonstrate use of user defined packages.
I) // save below file Sum.java
package pack;
public class Sum
{
public void getSum(int a,int b)
{
System.out.println("\nSum Of Two Numbers"+a+" and "+b+"="+(a+b));
}
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
50
Object Oriented Programming Through Java Laboratory Record
II) // save below file PackDemo.java
import pack.Sum;
class PackDemo
{
public static void main(String[] args)
{
Sum s=new Sum();
s.getSum(10,20);
}}
o/p:
2) write a java package for book class and then import and display the result.
1) // Save below file Book.java
package packagetest;
public class Book
{
int book_no,book_id,book_pages;
public Book(int a,int b, int c)
{
book_no=a;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
book_id=b;
book_pages=c;
}
public void book_info()
{
System.out.println("The Book No"+book_no);
System.out.println("The Book Id "+book_id);
System.out.println("The Book Pages"+book_pages);
}
}
2. //Save below file BookMain.java
import packagetest.Book;
class BookReader
{
public static void main(String[] args)
{
Book b=new Book(12,15,86);
b.book_info();
}
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
52
Object Oriented Programming Through Java Laboratory Record
o/p:
3) write a java program to find the cube of a number for various data types using package
and then import and display the results.
//1.program to create package
package mathematics;
public class Mathmethods
{
public static float Cube(float n)
{
return(n*n*n);
}
public static int Cube(int n)
{
return(n*n*n);
}
public static double Cube(double n)
{
return(n*n*n);
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
public static long Cube(long n)
{
return(n*n*n);
}
}
//2. program to import
import mathematics.Mathmethods;
//import java.io.*;
import java.util.Scanner;
class Cube
{
public static void main(String S[])
{
//int a=20;
Scanner m=new Scanner(System.in);
System.out.println("the given number is ");
int a=m.nextInt();
Mathmethods mm = new Mathmethods();
int b = Mathmethods.Cube(a);
System.out.println("cube is " +b);
}
}
o/p:
javac –d . Mathmethods.java
javac Cube.java
java Cube
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
IX ) MultipleInheritance:
we cannot use multiple inheritance means one class cannot be inherited from more than one
classes. To use this process, Java provides an alternative approach known as “Interface”.
Interface:
An Interface is usually a kind of class. Interface contain only Abstract methods and Final
variable. A java class cannot be a sub class of more than one class, but a class can implements
more than one Interfaces.
1) Write a Java program to illustrate the multiple inheritance by using Interfaces.
import java.lang.*;
import java.io.*;
interface Exam
{
void percent_cal();
}
class Student
{
String name;
int roll_no,mark1,mark2;
Student(String n, int r, int m1, int m2)
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
name=n;
roll_no=r;
mark1=m1;
mark2=m2;
}
void display()
{
System.out.println ("\nName of Student: "+name);
System.out.println ("Roll No. of Student: "+roll_no);
System.out.println ("Marks of Subject 1: "+mark1);
System.out.println ("Marks of Subject 2: "+mark2);
}}
class Result extends Student implements Exam
{
Result(String n, int r, int m1, int m2)
{
super(n,r,m1,m2);
}
public void percent_cal()
{
int total=(mark1+mark2);
float percent=total*100/200;
System.out.println ("Percentage: "+percent+"%");
}
void display()
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
super.display();
}}
class MultipleInheritenceDemo
{
public static void main(String args[])
{
Result R = new Result("Anoop reddy",12,93,84);
R.display();
R.percent_cal();
}}
o/p:
X) Super , Static, final key words
1)Write a java program to illustrate the keywords i)super ii)static iii)final
class Super
{
static final int a=20;
static int b;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
int c=100;
}
class SuperDemo extends Super
{
void display()
{
System.out.println("\nFinal Variable=" +super.a);
System.out.println("Super class Variable=" +super.c);
System.out.println("Static Variable="+b);
}
public static void main(String[] args)
{
SuperDemo s=new SuperDemo();
s.display();
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
58
Object Oriented Programming Through Java Laboratory Record
XI) Exception handling: Exception is an abnormal condition.The exception handling is one of
the powerful mechanism provided in java. It provides the mechanism to handle the runtime
errors so that normal flow of the application can be maintained.
1)wajp to demonstrate simple example for exception handling
import java.lang.*;
class Error2
{
public static void main(String args[])
{
int a=10;
int b=5;
int c=5;
int x,y;
try
{
x=a/(b-c);
}
catch (ArithmeticException e)
{
System.out.println("division by zero");
}
y=a/(b+c);
System.out.println("y=" +y);
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
59
Object Oriented Programming Through Java Laboratory Record
2)Wajp to demonstrate exception handling with multiple catch blocks
class ExcHandling
{
public static void main(String ar[])
{
int a[]={5,10};
int b=5;
try
{
int x=a[2]/(b-a[0]);
}
catch(ArithmeticException e)
{
System.out.println("div by zero");
}
catch(ArrayIndexOutOfBoundsException e)
{
System.out.println("Array out of bound Error");
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
}
int y=a[1]/a[0];
System.out.println("y value is " +y);
}
}
o/p:
3) wajp using NumberFormat exception
import java.lang.Exception;
class ExHan2
{
public static void main(String args[])
{
int invalid=0,number,count=0;
for(int i=0;i<args.length;i++)
{
try
{
number=Integer.parseInt(args[i]);
}
catch(NumberFormatException e)
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
invalid=invalid + 1;
System.out.println("\n Invalid Number= " +args[i]);
continue;
}
count=count +1;
}
System.out.println("\n Valid Number= " +count);
System.out.println("\n Invalid Number= " +invalid);
}
}
o/p:
4)Wajp for user defined exception
class InsufBalance extends Exception
{
InsufBalance(String s)
{
super(s);
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
}
}
class Mainbalance
{
public static void main(String s[])
{
int bal=5000;
try
{
int withdraw=Integer.parseInt(s[0]);
if(bal<withdraw)
{
InsufBalance i= new InsufBalance("No susch bance exist");
throw i;
}
else
{
bal=bal-withdraw;=
System.out.println("balance is "+bal);
}
}
catch(InsufBalance i)
{
System.out.println(i);
}
catch(Exception e)
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
{
System.out.println(e);
}
}
}
o/p:
XII) How to make executable jar files in JDK1.3.1?
Instructions for creating an Executable .jar file
Make or modify the Manifest.Mf to yourManifest.MF
1) Your Class name with main is the class name without .class exentension.
2) No extra spaces following the your class name with main.
Manifest-Version:1.0
Main-Class: YourClassNameWithMain
Created-by:1.2(Sun Microsystems Inc.)
On Command line : type the following
jar cvfm YourJarFileName.jar YourManifest.MF*
(or)
Jar cvfm yourJarFileName.jar YourManifest.MF –C classes yourClassPath
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
Drag-drop the YourJarFileName.jar to your desktop double click it, it runs if your p rogram only
has System.out.println(“whatever”); statements, it will displaynothing. The same will happen
when you run it using java at commandline.
Instructions for creating a .jar file. jar utility comes with your JDK1.2.2 It compresses your file
similar to zip utility, and more Java.
You need some windows code to see it run.
You can use it on any machine installed JDK
Create a folder name it anything.Make that folder your current directory
Put all your files turning in that directory. Be sure to put your html file, if there is one
At your dos prompt, while you are in the directory that you created , type in:
jar cvf Prj02.jar*
This will take ALL the files in the directory including subdirectories and place them in a .jar file
Prj02 that can be replaced by any of your desired jar file name.
To test it, you can extract the contents of jar file by typing:
jar xvf Prj02.jar
XIII) Multithreading:
Multithreading is a conceptual programming paradigm where a program(process) is
divided into 2 or more sub programs(processes) , which can be implemented at the same time
in parallel.
1) Write a Java program to demonstrate the concept of daemon threads
class DaemonThread extends Thread
{
int i;
public void run()
{
for(i=0;i<5;i++);
{
System.out.println(this.getName()+" "+i);
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
}
}
public static void main(String[] args)
{
DaemonThread d=new DaemonThread();
DaemonThread d1=new DaemonThread();
d.setName("\nDAEMON THREAD");
d1.setName("NORMAL THREAD");
d.setPriority(Thread.MIN_PRIORITY);
d.start();
d1.start();
}
}
o/p:
2) Write a Java program to demonstrate the concept of synchronization by suitable example
class Addition
{
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
synchronized void add()
{
int a=99,b=1;
System.out.println("c="+(a+b));
try
{
Thread.sleep(3000);
System.out.println("After Sleep()");
}
catch (InterruptedException e)
{
}
}
}
class Synchro extends Thread
{
Addition obj1;
public Synchro(Addition a)
{
obj1=a;
Thread t1=new Thread(this);
Thread t2=new Thread(this);
Thread t3=new Thread(this);
t1.start();
t2.start();
t3.start();
Faculty name : G.kalpana
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Year/Sem : I st year /2nd sem
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}
public void run()
{
obj1.add();
{
System.out.println("ThreadNameis"+Thread.currentThread(). getName());
}
}
}
class TestSynchro
{
public static void main(String[] args)
{
Addition d=new Addition();
Synchro s=new Synchro(d);
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
68
Object Oriented Programming Through Java Laboratory Record
3) Write a Java program to demonstrate the concept of Inter thread communication by
Suitable example
public class ThreadDemo2 extends Thread
{
public void run()
{
for(int i=0;i<20;i++)
{
System.out.println(getName()+":"+i);
}
}
public static void main(String[] args)
{
System.out.println("main started");
ThreadDemo2 td=new ThreadDemo2();
ThreadDemo2 td1=new ThreadDemo2();
td.setName("Thread1");
td1.setName("Thread2");
td.start();
td1.start();
td.yield();
System.out.println("Main Exited");
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
69
Object Oriented Programming Through Java Laboratory Record
4) Write a program to demonstrate string tokenizer.
import java.util.StringTokenizer;
import java.io.*;
class StringTockenizerDemo
{
public static void main(String naren[]) throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter All String Digits with Spaces");
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
String str=br.readLine();
StringTokenizer st=new StringTokenizer(str);
int a,sum=0;
String s;
while(st.hasMoreTokens())
{
s=st.nextToken();
a=Integer.parseInt(s);
sum=sum+a;
}
System.out.println("Sum of The given Integers"+sum);
}
}
o/p:
5) Example of MultiThreads using Thread Class
import java.io.*;
class A extends Thread
{
public void run()
{
System.out.println("Start A");
for(int i=1; i<=5; i++) System.out.println("Thread A i :"+i);
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
71
Object Oriented Programming Through Java Laboratory Record
System.out.println("Exit A");
}
}
class B extends Thread
{
public void run()
{
System.out.println("Start B");
for(int j=1; j<=5; j++) System.out.println("Thread B j :"+j);
System.out.println("Exit B");
}
}
class C extends Thread
{
public void run()
{
System.out.println("Start C");
for(int k=1; k<=5; k++) System.out.println("Thread C k :"+k);
System.out.println("Exit C");
}
}
class D extends Thread
{
public void run()
{
System.out.println("Start D");
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
for(int l=1; l<=5; l++)
System.out.println("Thread A l :"+l);
System.out.println("Exit D");
}}
class threadtest
{
public static void main(String S[])throws IOException
{ new A().start();
new B().start();
new C().start();
new D().start();
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
73
Object Oriented Programming Through Java Laboratory Record
XIV) File I/O and Streams:
A file is a collection of related records placed in a particular area on disk. Storing and managing
data using files is known as file processing which includes creating,updating files and
manipulation of data.Reading and writing of data in a file can be done at the level of bytes or
characters or fields.
Input refers to the flow of data into a program and output means the flow of data out of a
program. A stream in java is a path along which data flows. The java.io package contains a large
number of stream classes that provide capabilities for processing all type of data.
1) Wajp to Demonstration of FileOutputStream and PrintStream classes
import java.io.*;
class FileOutput
{
public static void main(String args[])
{
FileOutputStream out; // declare a file output object
PrintStream p; // declare a print stream object
try
{
// Create a new file output stream connected to "myfile.txt"
out = new FileOutputStream("myfile.txt");
// Connect print stream to the output stream
p = new PrintStream( out );
p.println ("This is written to a file myFile.txt");
p.close();
}
catch (Exception e)
{
System.err.println ("Error writing to the file myFile.txt");
}}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
74
Object Oriented Programming Through Java Laboratory Record
2) Wajp to Write bytes to a file
import java.io.*;
class WriteBytes
{
public static void main(String args[])
{
// declare and initialize a byte array
byte cities[]={'D','E','L','H','I','\n','C','H','E','N','N','A','I','\n','L','O','N','D','O','N','\n'};
//create an output file stream
FileOutputStream outfile=null;
try
{
//connect the outfile stream to city.txt
outfile=new FileOutputStream("city.txt");
//write data to the stream
outfile.write (cities);
outfile.close( );
}
catch(IOException ioe)
{
System.out.println(ioe);
System.exit(-1);
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
75
Object Oriented Programming Through Java Laboratory Record
}
}
o/p:
3) Wajp to copy bytes from one file to another
//copy bbytes from one to another
import java.io.*;
class CopyBytes
{
public static void main(String args[])
{
//declare input and output file streams
FileInputStream infile=null;
FileOutputStream outfile=null;
//declare a varible to hold a byte
byte byteRead;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
76
Object Oriented Programming Through Java Laboratory Record
try
{
//Connect infile to in.dat
infile = new FileInputStream("in.dat");
//Connect outfile to in.dat
outfile=new FileOutputStream("out.dat");
//Reading bytes from in.dat and writing to out.dat
do
{
byteRead=(byte)infile.read( );
outfile.write(byteRead);
}
while(byteRead !=-1);
}
catch(FileNotFoundException e)
{
System.out.println("File not fopund");
}
catch(IOException e)
{
System.out.println(e.getMessage( ));
}
finally
//close files
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
{
try
{
infile.close( );
outfile.close( );
}
catch(IOException e)
{ }
}
}
}
o/p:
XV) GUI and Event driven programming
Applets: Applets are small java programs that are primarily used in internet computing. They
can be transported over the internet from one computer to another and run using applet
viewer or any web browser.
Applets can perform arithmetic operations, display graphics, play sounds, accept user input ,
create animation, and play interactive games.
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
78
Object Oriented Programming Through Java Laboratory Record
1) Wajp for Sum of Two Numbers using Applet
import java.awt.*;
import java.applet.*;
/*Coding of HTML File <applet code = abc1.class width= 200 height=200> </applet> */
public class abc1 extends Applet
{
public void paint(Graphics g)
{
int a=100;
int b=200;
int sum = a+b;
String s = "The Sum is :" + String.valueOf(sum);
g.drawString( s, 200,100);
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
79
Object Oriented Programming Through Java Laboratory Record
2)Wajp for Applet using drawstring(), drawRect() and drawOval()
import java.awt.*;
import java.applet.*;
/*<applet code= "Objectdraw.class" height=400 width=400> </applet>*/
public class Objectdraw extends Applet
{
public void paint(Graphics g)
{
g.drawString("Hello World",20,20);
g.drawRect(40,40,30,50);
g.drawOval(150,150,40,50);
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
80
Object Oriented Programming Through Java Laboratory Record
3) Write a Java program to demonstrate banner applet.
import java.awt.*;
import java.applet.*;
/*<HTML> <BODY> <APPLET CODE = "SampleBanner" WIDTH = "460" HEIGHT =
"220"></APPLET> </BODY> </HTML> */
public class SampleBanner extends Applet implements Runnable
{
String str = "This is a simple Banner developed by Class Naren ";
Thread t ;
boolean b;
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
81
Object Oriented Programming Through Java Laboratory Record
public void init()
{
setBackground(Color.gray);
setForeground(Color.yellow);
}
public void start()
{
t = new Thread(this);
b = false; t.start();
}
public void run ()
{
char ch;
for( ; ; )
{
try
{
repaint();
Thread.sleep(250);
ch = str.charAt(0);
str = str.substring(1, str.length());
str = str + ch;
}
catch(InterruptedException e)
{}
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
82
Object Oriented Programming Through Java Laboratory Record
} public void paint(Graphics g)
{
g.drawRect(1,1,300,150);
g.setColor(Color.green);
g.fillRect (1,1,300,150);
g.setColor(Color.red);
g.drawString(str, 1, 150);
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
83
Object Oriented Programming Through Java Laboratory Record
4) wajp for Bouncing of a Ball using applet
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
/*<applet code= "Bounce.class" height=900 width=900> </applet>*/
class Ball
{
int x,y,radius,dx,dy;
Color BallColor;
public Ball(int x,int y,int radius,int dx,int dy,Color bColor)
{
this.x=x;
this.y=y;
this.radius=radius;
this.dx=dx;
this.dy=dy;
BallColor=bColor;
}}
public class Bounce extends Applet implements Runnable
{
Ball redBall;
public void init()
{
redBall=new Ball(250,80,50,2,4,Color.red);
Thread t=new Thread(this);
t.start();
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
84
Object Oriented Programming Through Java Laboratory Record
}
public void paint(Graphics g)
{
g.setColor(redBall.BallColor);
setBackground(Color.pink);
//g.setcolor(redBall.BallColor);
g.fillOval(redBall.x, redBall.y, redBall.radius,redBall.radius);
g.drawLine(150,400,50,500);
g.drawLine(150,400,450,400);
g.drawLine(50,500,350,500);
g.drawLine(450,400,350,500);
g.drawRect(50,500,20,100);
g.drawRect(330,500,20,100);
g.drawLine(450,400,450,500);
g.drawLine(430,500,450,500);
g.drawLine(430,500,430,420);
}
public void run()
{ while(true)
{
try
{
displacementOperation(redBall);
Thread.sleep(20);
repaint();
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
85
Object Oriented Programming Through Java Laboratory Record
catch(Exception e)
{
}
}
}
public void displacementOperation(Ball ball)
{
if(ball.y >= 400 || ball.y <= 0)
{
ball.dy=-ball.dy; } ball.y=ball.y+ball.dy;
}
}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
86
Object Oriented Programming Through Java Laboratory Record
XVI) Abstract WindowToolkit(AWT):
Awt contains numerous classes and methods that allow you to create and manage
windows. A common use of the AWT is in applets , its is also used to sreate stand-alone
windows that run in a GUI environment , such as Windows.
1) Wajp that prints a message by clicking on the button using AWT events and applets
1. import java.applet.*;
2. import java.awt.*;
3. import java.awt.event.*;
4. public class EventApplet extends Applet implements ActionListener
5. {
6. Button b;
7. TextField tf;
8. public void init()
9. {
10. tf=new TextField();
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
87
Object Oriented Programming Through Java Laboratory Record
11. tf.setBounds(30,40,150,20);
12.
13. b=new Button("Click");
14. b.setBounds(80,150,60,50);
15.
16. add(b);add(tf);
17. b.addActionListener(this);
18.
19. setLayout(null);
20. }
21.
22. public void actionPerformed(ActionEvent e)
23. {
24. tf.setText("Welcome");
25. }
26. }
In the above example, we have created all the controls in init() method because it is invoked
only once.
myapplet.html
1.
2.
3.
4.
5.
6.
<html>
<body>
<applet code="EventApplet.class" width="300" height="300">
</applet>
</body>
</html>
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
88
Object Oriented Programming Through Java Laboratory Record
2) Write a java program to Demonstrate GridLayout
import java.awt.*;
import java.applet.*;
/*
<applet code="GridLayoutDemo" width=300 height=200>
</applet>
*/
public class GridLayoutDemo extends Applet
{
static final int n = 4;
public void init()
{
setLayout(new GridLayout(n, n));
setFont(new Font("SansSerif", Font.BOLD, 24));
for(int i = 0; i < n; i++)
{
for(int j = 0; j < n; j++)
{
int k = i * n + j;
if(k > 0)
add(new Button("" + k));
}
}
}
}
Output:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
89
Object Oriented Programming Through Java Laboratory Record
Example of GridLayout class:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
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23.
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31.
import java.awt.*;
import javax.swing.*;
public class MyGridLayout{
JFrame f;
MyGridLayout(){
f=new JFrame();
JButton b1=new JButton("1");
JButton b2=new JButton("2");
JButton b3=new JButton("3");
JButton b4=new JButton("4");
JButton b5=new JButton("5");
JButton b6=new JButton("6");
JButton b7=new JButton("7");
JButton b8=new JButton("8");
JButton b9=new JButton("9");
f.add(b1);f.add(b2);f.add(b3);f.add(b4);f.add(b5);
f.add(b6);f.add(b7);f.add(b8);f.add(b9);
f.setLayout(new GridLayout(3,3));
//setting grid layout of 3 rows and 3 columns
f.setSize(300,300);
f.setVisible(true);
}
public static void main(String[] args) {
new MyGridLayout();
}
}
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
90
Object Oriented Programming Through Java Laboratory Record
3) Write a Java program to demonstrate an application involving GUI with controls menus
and event handling.
import javax.swing.*;
public class SwingMenu
{
public static void main(String[] args)
{
SwingMenu s = new SwingMenu();
}
public SwingMenu()
{
JFrame frame = new JFrame("Creating a JMenuBar, JMenu, JMenuItem and seprator
Component");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menubar = new JMenuBar();
JMenu filemenu = new JMenu("File");
filemenu.add(new JSeparator());
JMenu editmenu = new JMenu("Edit");
editmenu.add(new JSeparator());
JMenuItem fileItem1 = new JMenuItem("New");
JMenuItem fileItem2 = new JMenuItem("Open");
JMenuItem fileItem3 = new JMenuItem("Close");
fileItem3.add(new JSeparator());
JMenuItem fileItem4 = new JMenuItem("Save");
JMenuItem editItem1 = new JMenuItem("Cut");
JMenuItem editItem2 = new JMenuItem("Copy");
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
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Object Oriented Programming Through Java Laboratory Record
editItem2.add(new JSeparator());
JMenuItem editItem3 = new JMenuItem("Paste");
JMenuItem editItem4 = new JMenuItem("Insert");
filemenu.add(fileItem1); filemenu.add(fileItem2);
filemenu.add(fileItem3); filemenu.add(fileItem4);
editmenu.add(editItem1);
editmenu.add(editItem2);
editmenu.add(editItem3);
editmenu.add(editItem4);
menubar.add(filemenu);
menubar.add(editmenu);
frame.setJMenuBar(menubar);
frame.setSize(400,400);
frame.setVisible(true);
}}
o/p:
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
92
Object Oriented Programming Through Java Laboratory Record
Faculty name : G.kalpana
Course: M.C.A
Year/Sem : I st year /2nd sem
93