Download Question No :1 Read this piece of code carefully if("String".toString

Question No :1
Read this piece of code carefully
if("String".toString() == "String")
System.out.println("Equal");
else
System.out.println("Not Equal");
(Choose correct one from multiple below)
1. the code will compile an print "Equal".
2. the code will compile an print "Not Equal".
3. Not Compile
4. None
correct is :1
----------------------------------------------------------------------------Question No :2
Read this piece of code carefully
if("String".trim() == "String")
System.out.println("Equal");
else
System.out.println("Not Equal");
(Choose correct one from multiple below)
1. the code will compile an print "Equal".
2. the code will compile an print "Not Equal".
3. Not Complile
4. None
correct is :1
----------------------------------------------------------------------------Question No :3
public class Test {
public static void main(String args[]){
Test question = new Test();
question.method(null);
}
public void method(Object o){
System.out.println("Object Verion");
}
public void method(String s){
System.out.println("String Version");
}
}
(Choose correct one from multiple below)
1. The code does not compile
2. The code compiles cleanly and shows "Object Version".
3. The code compiles cleanly and shows "String Version"
4. The code throws an Exception at Runtime.
correct is :3
----------------------------------------------------------------------------Question No :4
public class Test {
public static void main(String args[]){
Test question = new Test();
question.method(null);
}
public void method(StringBuffer o){
System.out.println("Object Verion");
}
public void method(String s){
System.out.println("String Version");
}
}
(Choose correct one from multiple below)
1. The code does not compile
2. The code compiles cleanly and shows "StringBuffer Version".
3. The code compiles cleanly and shows "String Version"
4. The code throws an Exception at Runtime
correct is :1
----------------------------------------------------------------------------Question No :5
Read the following code below.
public interface AQuestion{
public abstract void someMethod() throws Exception;
}
A Class implementing this interface should
(Choose correct one from multiple below)
1. Necessarily be an abstract class.
2. Should have the method public abstract void someMethod();
3. Should have the method public void someMethod() which has to throw an
exception which is a subclass of java.lang.Exception.
4. Should have the method public void someMethod() which need not throw
an Exception
correct is :4
----------------------------------------------------------------------------Question No :6
An Interface can never be private or protected.
(Choose correct one from multiple below)
1. true
2. false
3. None
4. 1 or 2
correct is :1
----------------------------------------------------------------------------Question No :7
A String Class
(Choose correct one from multiple below)
1. final
2. non final
3. Serializable
4. 1 and 3
correct is :4
----------------------------------------------------------------------------Question No :8
public class AQuestion{
private int i = j;
private int j = 10;
public static void main(String args[]){
System.out.println((new AQuestion()).i);
}
}
(Choose correct one from multiple below)
1. 10
2. Comiplation error
3. 0
4. None
correct is :2
----------------------------------------------------------------------------Question No :9
for(int i = 0; i < 3; i++) {
try {
for(int j = 0; j < 3; j++) {
if (i==j) continue;
else if (i>j) continue ;
System.out.print("A ");
}
}
finally {
System.out.print("B ");
}
System.out.print("C ");
}
What is the output?
(Choose correct one from multiple below)
1. Compile Error. finally not allowed.
2. A A B C A B C B C
3. A A C A C C
4. None
correct is :2
----------------------------------------------------------------------------Question No :10
int count=0, i=0;
do {
count *= i;
i++;
if(count == 1) continue;
count++;
} while(i<3);
System.out.println(count);
What is the output?
(Choose correct one from multiple below)
1. 4
2. 2
3. 3
4. 5
correct is :3
----------------------------------------------------------------------------Question No :11
int count=0;
if(check4Biz("abc").equals("Y") || count == 2) {}
Referring to the above, what datatype is returned by method check4Biz()?
(Choose correct one from multiple below)
1. String
2. char
3. Object
4. 1 and 3
correct is :4
----------------------------------------------------------------------------Question No :12
int a = 7;
int b = 4;
a = b;
a = a + 1;
System.out.println(a);
what will be the output ?
(Choose correct one from multiple below)
1. 8
2. 5
3. 7
4. 4
correct is :2
----------------------------------------------------------------------------Question No :13
What is the output?
System.out.println("The answer is: "+18+3);
(Choose correct one from multiple below)
1. 21
2. 183
3. Comiple Error
4. None
correct is :2
----------------------------------------------------------------------------Question No :14
What is the value of p?
int p = 10 / 3;
(Choose correct one from multiple below)
1. 3
2. 3.33333
3. 0
4. 1
correct is :1
----------------------------------------------------------------------------Question No :15
What is the value of y?
int y = 19 % 4;
(Choose correct one from multiple below)
1. 3
2. 4
3. 2
4. Compile Error
correct is :1
----------------------------------------------------------------------------Question No :16
What is the value of y?
int y = 2 % 4;
(Choose correct one from multiple below)
1. 0
2. 2
3. 4
4. Compile Error
correct is :2
----------------------------------------------------------------------------Question No :17
int j;
for(int i=0;i<14;i++) {
if(i<10) {
j = 2 + i;
}
System.out.println("j: " + j + " i: " + i);
}
What is WRONG with the above code?
(Choose correct one from multiple below)
1. Integer "j" is not initialized.
2. Nothing.
3. You cannot declare integer i inside the for-loop declaration
4. The syntax of the "if" statement is incorrect
correct is :1
----------------------------------------------------------------------------Question No :18
int values[] = {1,2,3,4,5,6,7,8};
for(int i=0;i< X; ++i)
System.out.println(values[i]);
Referring to the above, what value for X will print all members of array
"values"?
(Choose correct one from multiple below)
1. 7
2. 8
3. 9
4. 10
correct is :2
----------------------------------------------------------------------------Question No :19
Which code declares class A to belong to the mypackage.financial package?
(Choose correct one from multiple below)
1. package mypackage; <br> package financial;
2. import *.*;
3. import mypackage.financial.*;
4. None of the above
correct is :3
----------------------------------------------------------------------------Question No :20
class Class1 {
public static void main(String args[]) {
int total = 0;
int[] i = new int[3];
for(int j=1;j<= i.length; j++)
total += (i[j] = j);
System.out.println(total);
}
}
What is the output ?
(Choose correct one from multiple below)
1. 3
2. 4
3. 6
4. The system will throw an ArrayIndexOutOfBoundsException
correct is :4
----------------------------------------------------------------------------Question No :21
class A {
B b = new B();
C c = (C) b;
}
Referring to the above, when is the cast of "b" to class C allowed?
(Choose correct one from multiple below)
1. B and C are subclasses of the same superclass.
2. If B and C are superclasses of the same subclass
3. B is a subclass of C.
4. B is a superclass of C.
correct is :3
----------------------------------------------------------------------------Question No :22
Which java.sql class can return multiple result sets?
(Choose correct one from multiple below)
1. Statement
2. PreparedStatement
3. CallableStatement
4. None
correct is :1
----------------------------------------------------------------------------Question No :23
try{
File f = new File("a.txt");
}catch(Exception e){
}catch(IOException io){
}
Is this code create new file name a.txt ?
(Choose correct one from multiple below)
1. True
2. False
3. Compilation Error
4. None
correct is :3
----------------------------------------------------------------------------Question No :24
How can you have a "try" block that invokes methods that throw two
different exceptions?
(Choose correct one from multiple below)
1. Catch one exception in a "catch" block and the other in a "finally"
block.
2. Include a "catch" block for each exception.
3. Not Possible in Java
4. Catch one exception in a "catch" block and the other via the return
value.
correct is :2
----------------------------------------------------------------------------Question No :25
Is the code compile ?
try{
}catch(IOException e){
}
(Choose correct one from multiple below)
1. Yes
2. No
3. None
4. None
correct is :2
----------------------------------------------------------------------------Question No :26
Which one of the following is the equivalent of main() in a thread?
(Choose correct one from multiple below)
1. start()
2. run()
3. go()
4. begin()
correct is :2
----------------------------------------------------------------------------Question No :27
What happens if a class defines a method with the same name and
parameters as a method in its superclass?
(Choose correct one from multiple below)
1. The compiler automatically renames the subclass method.
2. The program runs since because overriding methods is allowed
3. The program throws a DuplicateMethod exception.
4. The compiler shows a DuplicateMethod error.
correct is :2
----------------------------------------------------------------------------Question No :28
public class C {
static int getIt(int i) {
return i;
}
}
What is a consequence of "static" in the code above?
(Choose correct one from multiple below)
1. getIt() returns a static int
2. getIt() can only access static properties of class C
3. getIt() is invoked only by other static methods
4. Subclasses of class A must override method getIt()
correct is :1
----------------------------------------------------------------------------Question No :29
try {
int values[] = {1,2,3,4,3,2,1};
for (int i = values.length-1; i >= 0; i++)
System.out.print( values[i] + " " );
} catch (Exception e) {
System.out.print("2" + " ");
} finally {
System.out.print("3" + " ");
}
What is the output ?
(Choose correct one from multiple below)
1. 1 2 3 4 3 2 1
2. 1 2
3. 1 3
4. 1 2 3
correct is :4
----------------------------------------------------------------------------Question No :30
Which one of the following is a limitation of subclassing the Thread
class?
(Choose correct one from multiple below)
1. You must catch the ThreadDeath exception.
2. You must implement the Threadable interface.
3. You cannot have any static methods in the class
4. You cannot subclass any other class.
correct is :4
----------------------------------------------------------------------------Question No :31
String s1 = new String("ryjukjkhj");
String s2 = new String(" java test");
String s3;
s3=s1.substring(1,5) +
s2.toUpperCase().trim().substring(1,5);
System.out.println(s3);
What is the output ?
(Choose correct one from multiple below)
1. yjukAVAV
2. yjukAVA
3. yjukVA
4. none
correct is :2
----------------------------------------------------------------------------Question No :32
import java.io.*;
class Player {
Player() { System.out.print("p"); }
}
class CardPlayer extends Player implements Serializable {
CardPlayer() { System.out.print("c"); }
public static void main(String[] args) {
CardPlayer c1 = new CardPlayer();
try {
FileOutputStream fos = new FileOutputStream("play.txt");
ObjectOutputStream os = new ObjectOutputStream(fos);
os.writeObject(c1);
os.close();
FileInputStream fis = new FileInputStream("play.txt");
ObjectInputStream is = new ObjectInputStream(fis);
CardPlayer c2 = (CardPlayer) is.readObject();
is.close();
} catch (Exception x ) { }
}
}
What is the result?
(Choose correct one from multiple below)
1. pc
2. pcc
3. pcp
4. pcpc
correct is :3
----------------------------------------------------------------------------Question No :33
URLConnection instance represents a link for accessing or communicating
with the resource at the location?
(Choose correct one from multiple below)
1. true
2. false
3. can't say
4. none of the above
correct is :1
----------------------------------------------------------------------------Question No :34
The______________ listener is notified when attributes are added to,
removed from, or replaced in the Servlet context.
(Choose correct one from multiple below)
1. Session Attribute
2. Servlet context attribute
3. Session Listeners
4. Session context Listeners
correct is :2
----------------------------------------------------------------------------Question No :35
Which code segment could execute the stored procedure "countRecs()"
located in a database server?
(Choose correct one from multiple below)
1. Statement stmt = connection.createStatement(); Statement stmt =
connection.createStatement();
2. CallableStatement cs = con.prepareCall("{call COUNTRECS}");
3. StoreProcedureStatement spstmt =
connection.createStoreProcedure("countRecs()");
4. Statement stmt =
connection.createStatement();stmt.executeStoredProcedure("countRecs()");
correct is :2
----------------------------------------------------------------------------Question No :36
public class A{
private void test1(){
System.out.println("test1 A");
}
}
public class B extends A{
public void test1(){
System.out.println("test1 B");
}
}
public class outputtest{
public static void main(String[] args){
A b = new B();
b.test1();
}
}
What is the output?
(Choose correct one from multiple below)
1. test1 A
2. test1 B
3. Not complile because test1() method in class A is not visible.
4. None of the above
correct is :3
----------------------------------------------------------------------------Question No :37
public class A{
private void test1(){
System.out.println("test1 A");
}
}
public class B extends A{
public
void test1(){
System.out.println("test1 B");
}
}
public class Test{
public static void main(String[] args){
B b = new B();
b.test1();
}
}
What is the output?
(Choose correct one from multiple below)
1. test1 B
2. test1 A
3. Not complile because test1() method in class A is not visible
4. None of the above
correct is :1
----------------------------------------------------------------------------Question No :38
public class A{
public void test1(){
System.out.println("test1 A");
}
}
public class B extends A{
public void test1(){
System.out.println("test1 B");
}
}
public class Test{
public static void main(String[] args){
A b = new B();
b.test1();
}
}
What is the output?
(Choose correct one from multiple below)
1. test1 B
2. test1 A
3. Not complile because test1() method in class A is not visible
4. None of the above
correct is :1
----------------------------------------------------------------------------Question No :39
Which statement is correct ?
(Choose correct one from multiple below)
1. If super class has different constructor other then default then in
the sub class you can use default constructor
2. If super class has different constructor other then default then in
the sub class you can?t use default constructor
3. Both are true
4. none of the above
correct is :2
----------------------------------------------------------------------------Question No :40
public class C {
public C(int i){
}
}
public class D extends C {
public D(){
}
}
Does the above code compile ?
(Choose correct one from multiple below)
1. Not compile
2. compile
3. Can't say
4. None of the above
correct is :1
----------------------------------------------------------------------------Question No :41
public class C {
public C(int i){
}
}
public class D extends C {
public D(int i){
super(i);
}
}
Does the above code compile ?
(Choose correct one from multiple below)
1. Not compile
2. compile
3. Exception on runtime.
4. None of the above
correct is :2
----------------------------------------------------------------------------Question No :42
public class C {
public C(){
System.out.println("C");
}
}
public class D extends C {
public D(int i){
System.out.println("D-I");
}
public D(int i, int j){
System.out.println("D-I-J");
}
}
public class Test{
public static void main(String[] args){
C c = new D();
}
}
What is the output ?
(Choose correct one from multiple below)
1. D-I-J
2. D-I
3. C
4. NOT COMPILE because D don?t have default constructor
correct is :4
----------------------------------------------------------------------------Question No :43
What is the output?
Integer i = new Integer(42);
Long l = new Long(42);
Double d1 = new Double(42.0);
if(i.equals(l)){
System.out.println("int true");
}
if(i.equals(d1)){
System.out.println("int true");
}
(Choose correct one from multiple below)
1. int true
2. int true
3. No Result
4. None of the above
correct is :3
----------------------------------------------------------------------------Question No :44
What will happen when you attempt to compile and run the following code?
public class Static
{
static
{
int x = 5;
}
static int x,y;
public static void main(String args[])
{
x--;
myMethod();
System.out.println(x + y + ++x);
}
public static void myMethod()
{
y = x++ + ++x;
}
}
(Choose correct one from multiple below)
1. 1
2. 2
3. 3
4. 7
correct is :4
----------------------------------------------------------------------------Question No :45
Given the following code, what will be the output?
class Value
{
public int i = 15;
}
public class Test
{
public static void main(String argv[])
{
Test t = new Test();
t.first();
}
public void first()
{
int i = 5;
Value v = new Value();
v.i = 25;
second(v, i);
System.out.println(v.i);
}
public void second(Value v, int i)
{
i = 0;
v.i = 20;
Value val = new Value();
v = val;
System.out.println(v.i + " " + i);
}
}
(Choose correct one from multiple below)
1. 15 0 20
2. 15 0 15
3. 20 0 20
4. 0 15 20
correct is :1
----------------------------------------------------------------------------Question No :46
What will happen when you attempt to compile and run the following code?
class MyParent
{
int x, y;
MyParent(int x, int y)
{
this.x = x;
this.y = y;
}
public int addMe(int x, int y)
{
return this.x + x + y + this.y;
}
public int addMe(MyParent myPar)
{
return addMe(myPar.x, myPar.y);
}
}
class MyChild extends MyParent
{
int z;
MyChild (int x, int y, int z)
{
super(x,y);
this.z = z;
}
public int addMe(int x, int y, int z)
{
return this.x + x + this.y + y + this.z + z;
}
public int addMe(MyChild myChi)
{
return addMe(myChi.x, myChi.y, myChi.z);
}
public int addMe(int x, int y)
{
return this.x + x + this.y + y;
}
}
public class MySomeOne
{
public static void main(String args[])
{
MyChild myChi = new MyChild(10, 20, 30);
MyParent myPar = new MyParent(10, 20);
int x = myChi.addMe(10, 20, 30);
int y = myChi.addMe(myChi);
int z = myPar.addMe(myPar);
System.out.println(x + y + z);
}
}
(Choose correct one from multiple below)
1. 300
2. 240
3. 120
4. 180
correct is :1
----------------------------------------------------------------------------Question No :47
What will be the result of executing the following code?
1.
2.
3.
boolean a = true;
boolean b = false;
boolean c = true;
4.
if (a == true)
5.
if (b == true)
6.
if (c == true)
System.out.println("Some things are
true in this world");
7.
else
System.out.println("Nothing is
true in this world!");
8.
else if (a && (b = c))
System.out.println("It's too confusing
to tell what is true and what is false");
9.
else
System.out.println("Hey this
won't compile");
(Choose correct one from multiple below)
1. The code won't compile
2. "Some things are true in this world" will be printed
3. "Hey this won't compile" will be printed
4. None of these
correct is :4
----------------------------------------------------------------------------Question No :48
What will happen when you attempt to compile and run the following code?
interface MyInterface
{
}
public class MyInstanceTest implements MyInterface
{
static String s;
public static void main(String args[])
{
MyInstanceTest t = new MyInstanceTest();
if(t instanceof MyInterface)
{
System.out.println("I am true interface");
}
else
{
System.out.println("I am false interface");
}
if(s instanceof String)
{
System.out.println("I am true String");
}
else
{
System.out.println("I am false String");
}
}
}
(Choose correct one from multiple below)
1. Prints : "I am true interface" followed by " I am true String"
2. Prints : "I am false interface" followed by " I am false String"
3. Prints : "I am true interface" followed by " I am false String"
4. Runtime error
correct is :3
----------------------------------------------------------------------------Question No :49
What results from attempting to compile and run the following code?
public class Ternary
{
public static void main(String args[])
{
int a = 5;
System.out.println("Value is - " + ((a < 5) ? 9.9 : 9));
}
}
(Choose correct one from multiple below)
1. prints: Value is - 9
2. prints: Value is - 5
3. Compilation error
4. None of these
correct is :4
----------------------------------------------------------------------------Question No :50
In the following pieces of code, A and D will compile without any error.
True/False?
A: StringBuffer sb1 = "abcd";
B: Boolean b = new Boolean("abcd");
C: byte b = 255;
D: int x = 0x1234;
E: float fl = 1.2;
(Choose correct one from multiple below)
1. true
2. false
3. none of these
4. no idea
correct is :2
----------------------------------------------------------------------------Question No :51
Considering the following code, Which variables may be referenced
correctly at line 12?
1.
2.
3.
4.
5.
6.
7.
public class Outer
{
public int a = 1;
private int b = 2;
public void method(final int c)
{
int d = 3;
8.
class Inner
9.
{
10.
private void iMethod(int e)
11.
{
12.
13.
}
14.
}
15.
}
16.
}
(Choose correct one from multiple below)
1. a
2. b
3. c
4. d
correct is :1
----------------------------------------------------------------------------Question No :52
What will be the result of executing the following code?
public static void main(String args[])
{
char digit = 'a';
for (int i = 0; i < 10; i++)
{
switch (digit)
{
case 'x' :
{
int j = 0;
System.out.println(j);
}
default :
{
int j = 100;
System.out.println(j);
}
}
}
int i = j;
System.out.println(i);
}
(Choose correct one from multiple below)
1. 100 will be printed 10 times and then there will be a runtime
exception.
2. The code will not compile because the variable i cannot be declared
twice within the main() method.
3. The code will not compile because the variable j cannot be declared
twice within the switch statement.
4. None of these.
correct is :4
-----------------------------------------------------------------------------
Question No :53
What will happen when you attempt to compile and run the following code?
class MyThread extends Thread
{
public void run()
{
System.out.println("MyThread: run()");
}
public void start()
{
System.out.println("MyThread: start()");
}
}
class MyRunnable implements Runnable
{
public void run()
{
System.out.println("MyRunnable: run()");
}
public void start()
{
System.out.println("MyRunnable: start()");
}
}
public class MyTest
{
public static void main(String args[])
{
MyThread myThread = new MyThread();
MyRunnable myRunnable = new MyRunnable();
Thread thread = new Thread(myRunnable);
myThread.start();
thread.start();
}
}
(Choose correct one from multiple below)
1. Prints : MyThread: start() followed by MyRunnable:run()
2. Prints : MyThread: run() followed by MyRunnable:start()
3. Prints : MyThread: start() followed by MyRunnable:start()
4. Prints : MyThread: run() followed by MyRunnable:run()
correct is :1
----------------------------------------------------------------------------Question No :54
Given the code below, and making no other changes, which access modifiers
(public, protected or private) can legally be placed before myMethod() on
line 3?
If line 3 is left as it is, which keywords can legally be placed before
myMethod
on line 8?
1.
2.
3.
4.
5.
6.
7.
8.
9.
class HumptyDumpty
{
void myMethod() {}
}
class HankyPanky extends HumptyDumpty
{
void myMethod() {}
}
(Choose correct one from multiple below)
1. private or nothing(i.e. leaving it as it is) on line 3. Nothing(i.e.
leaving it as it is) or protected or public on line 8.
2. public or protected on line 3. private or nothing(i.e. leaving it as
it is) on line 8.
3. nothing(i.e. leaving it as it is) or protected or public on line 3.
private or nothing(i.e. leaving it as it is) on line 8.
4. None of the above.
correct is :1
----------------------------------------------------------------------------Question No :55
What will be the result of executing the following code?
// Filename; SuperclassX.java
package packageX;
public class SuperclassX
{
protected void superclassMethodX()
{
}
int superclassVarX;
}
// Filename SubclassY.java
1.
package packageX.packageY;
2.
3.
public class SubclassY extends SuperclassX
4.
{
5.
SuperclassX objX = new SubclassY();
6.
SubclassY objY = new SubclassY();
7.
void subclassMethodY()
8.
{
9.
objY.superclassMethodX();
10.
int i;
11.
i = objY.superclassVarX;
12.
}
13.
}
(Choose correct one from multiple below)
1. What will be the result of executing the following code?
2. Compilation error at line 9
3. Runtime exception at line 11
4. None of these
correct is :4
----------------------------------------------------------------------------Question No :56
Consider the class hierarchy shown below:
------------------------------------------------------------------class FourWheeler implements DrivingUtilities
class Car extends FourWheeler
class Truck extends FourWheeler
class Bus extends FourWheeler
class Crane extends FourWheeler
---------------------------------------------------------------------Consider the following code below:
1.
DrivingUtilities du;
2.
FourWheeler fw;
3.
Truck myTruck = new Truck();
4.
du = (DrivingUtilities)myTruck;
5.
fw = new Crane();
6.
fw = du;
Which of the statements below are true?
(Choose correct one from multiple below)
1. Line 4 will not compile because an interface cannot refer to an
object.
2. The code will compile and run.
3. The code will not compile without an explicit cast at line 6, because
going down the hierarchy without casting is not allowed.
4. The code will compile if we put an explicit cast at line 6 but will
throw an exception at runtime.
correct is :3
----------------------------------------------------------------------------Question No :57
What results from the following code?
1.
class MyClass
2.
{
3.
void myMethod(int i) {System.out.println("int version");}
4.
void myMethod(String s) {System.out.println("String
version");}
5.
public static void main(String args[])
6.
{
7.
MyClass obj = new MyClass();
8.
char ch = 'c';
9.
obj.myMethod(ch);
10.
}
11.
}
(Choose correct one from multiple below)
1. Line 4 will not compile as void methods can't be overridden.
2. An exception at line 9.
3. Line 9 will not compile as there is no version of myMethod which takes
a char as argument.
4. The code compiles and produces output: int version.
correct is :4
----------------------------------------------------------------------------Question No :58
What is the result when you compile and run the following code?
public class ThrowsDemo
{
static void throwMethod()
{
System.out.println("Inside throwMethod.");
throw new IllegalAccessException("demo");
}
public static void main(String args[])
{
try
{
throwMethod();
}
catch (IllegalAccessException e)
{
System.out.println("Caught " + e);
}
}
}
(Choose correct one from multiple below)
1. Compilation error
2. Runtime error
3. Compile successfully, nothing is printed.
4. Inside throwMethod. followed by caught:
java.lang.IllegalAccessExcption: demo
correct is :1
----------------------------------------------------------------------------Question No :59
What will be printed when you execute the following code?
class X
{
Y b = new Y();
X()
{
System.out.print("X");
}
}
class Y
{
Y()
{
System.out.print("Y");
}
}
public class Z extends X
{
Y y = new Y();
Z()
{
System.out.print("Z");
}
public static void main(String[] args)
{
new Z();
}
}
(Choose correct one from multiple below)
1. Z
2. YZ
3. XYZ
4. YXYZ
correct is :4
----------------------------------------------------------------------------Question No :60
What is the result when you compile and run the following code?
public class Test
{
public void method()
{
for(int i = 0; i < 3; i++)
{
System.out.print(i);
}
System.out.print(i);
}
}
(Choose correct one from multiple below)
1. 0122
2. 0123
3. Compilation error
4. None of these
correct is :3
-----------------------------------------------------------------------------
Question No :61
What will happen when you attempt to compile and run the following code?
int Output = 10;
boolean b1 = false;
if((b1 == true) && ((Output += 10) == 20))
{
System.out.println("We are equal " + Output);
}
else
{
System.out.println("Not equal! " + Output);
}
(Choose correct one from multiple below)
1. Compilation error, attempting to perform binary comparison on logical
data type.
2. Compilation and output of "We are equal 10".
3. Compilation and output of "Not equal! 20".
4. Compilation and output of "Not equal! 10".
correct is :4
----------------------------------------------------------------------------Question No :62
What will be the result of executing the following code?
Given that Test1 is a class.
1. Test1[] t1 = new Test1[10];
2. Test1[][] t2 = new Test1[5][];
3. if (t1[0] == null)
4. {
5.
t2[0] = new Test1[10]
6.
t2[1] = new Test1[10]
7.
t2[2] = new Test1[10]
8.
t2[3] = new Test1[10]
9.
t2[4] = new Test1[10]
10. }
11. System.out.println(t1[0]);
12. System.out.println(t2[1][0]);
(Choose correct one from multiple below)
1. The code will not compile because the array t2 is not initialized in
an unconditional statement before use.
2. The code will compile but a runtime exception will be thrown at line
12.
3. The code will compile but a runtime exception will be thrown at line
11.
4. None of these.
correct is :4
----------------------------------------------------------------------------Question No :63
What will happen when you attempt to compile and run the following code?
class Base
{
int i = 99;
public void amethod()
{
System.out.println("Base.amethod()");
}
Base()
{
amethod();
}
}
public class Derived extends Base
{
int i = -1;
public static void main(String argv[])
{
Base b = new Derived();
System.out.println(b.i);
b.amethod();
}
public void amethod()
{
System.out.println("Derived.amethod()");
}
}
(Choose correct one from multiple below)
1. Derived.amethod() -1 Derived.amethod()
2. Derived.amethod() 99
3. Derived.amethod() 99
4. Derived.amethod()
correct is :2
----------------------------------------------------------------------------Question No :64
What will be the output on compiling/running the following code?
public class MyThread implements Runnable
{
String myString = "Yes ";
public void run()
{
this.myString = "No ";
}
public static void main(String[] args)
{
MyThread t = new MyThread();
new Thread(t).start();
for (int i=0; i < 10; i++)
System.out.print(t.myString);
}
}
(Choose correct one from multiple below)
1. Compilation Error
2. Prints : Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes and so on.
3. Prints : No No No No No No No No No No and so on.
4. The Output cannot be determined.
correct is :4
----------------------------------------------------------------------------Question No :65
Multiple objects of MyClass (given below) are used in a program that uses
multiple Threadsto create new integer count. What will happen when other
threads
use the following code?
class MyClass
{
static private int myCount = 0;
int yourNumber;
private static synchronized int nextCount()
{
return ++myCount;
}
public void getYourNumber()
{
yourNumber = nextCount();
}
}
(Choose correct one from multiple below)
1. The code will give compilation error.
2. The code will give runtime error.
3. Each thread will get a unique number.
4. The uniqueness of the number among different Threads can't be
guaranteed.
correct is :3
----------------------------------------------------------------------------Question No :66
Which of the following lines will print false?
1.
2.
3.
4.
5.
6.
public class MyClass
{
static String s1 = "I am unique!";
public static void main(String args[])
{
String s2 = "I am unique!";
7.
String s3 = new String(s1);
8.
System.out.println(s1 == s2);
9.
System.out.println(s1.equals(s2));
10.
System.out.println(s3 == s1);
11.
System.out.println(s3.equals(s1));
12.
System.out.println(TestClass.s4 == s1);
13.
}
14.
}
15.
16.
class TestClass
17.
{
18.
static String s4 = "I am unique!";
19.
}
(Choose correct one from multiple below)
1. Lines 10 and 12
2. Line 12 only
3. Line 8 and 10
4. None of these
correct is :4
----------------------------------------------------------------------------Question No :67
What is displayed when the following code is compiled and executed?
String s1 = new String("Test");
String s2 = new String("Test");
if (s1==s2)
System.out.println("Same");
if (s1.equals(s2))
System.out.println("Equals");
(Choose correct one from multiple below)
1. Same Equals
2. Equals
3. Same
4. The code compiles, but nothing is displayed upon execution.
correct is :2
----------------------------------------------------------------------------Question No :68
What is displayed when the following is executed?
class Parent
{
private void method1()
{
System.out.println("Parent's method1()");
}
public void method2()
{
System.out.println("Parent's method2()");
method1();
}
}
class Child extends Parent
{
public void method1()
{
System.out.println("Child's method1()");
}
public static void main(String args[])
{
Parent p = new Child();
p.method2();
}
}
(Choose correct one from multiple below)
1. Compile time error
2. Run time error
3. prints : Parent's method2() Parent's method1()
4. prints : Parent's method2() Child's method1()
correct is :3
----------------------------------------------------------------------------Question No :69
How can you replace the comment at the end of main() with code that will
write the
integers 0 through 9?
import java.io.*;
class Write
{
public static void main(String[] args) throws Exception
{
File file = new File("temp.test");
FileOutputStream stream = new FileOutputStream(file);
// write integers here. . .
}
}
Choices:
1. DataOutputStream filter = new DataOutputStream(stream);
for (int i = 0; i < 10; i++)
{
filter.writeInt(i);
}
2. for (int i = 0; i < 10; i++)
{
file.writeInt(i);
}
3. for (int i = 0; i < 10; i++)
{
stream.writeInt(i);
}
4. DataOutputStream filter = new DataOutputStream(stream);
for (int i = 0; i < 10; i++)
{
filter.write(i);
}
5. for (int i = 0; i < 10; i++)
{
stream.write(i);
}
(Choose correct one from multiple below)
1. 1,2
2. 1
3. 2
4. 5
correct is :2
----------------------------------------------------------------------------Question No :70
What results from trying to compile and run the following code?
1.
import java.io.*;
2.
3.
class MyClass
4.
{
5.
public static void main(String args[])
6.
{
7.
try
8.
{
9.
FileOutputStream fos = new
FileOutputStream("abc");
10.
DataOutputStream dos = new DataOutputStream(fos);
11.
dos.writeByte(12);
12.
fos.write(100);
13.
fos.close();
14.
dos.close();
15.
16.
FileInputStream fis = new FileInputStream("abc");
17.
DataInputStream dis = new DataInputStream(fis);
18.
byte b = dis.readByte();
19.
System.out.print(b + " ");
20.
int i = dis.readInt();
21.
System.out.println(i);
22.
fis.close();
23.
dis.close();
24.
}
25.
catch(IOException e)
26.
27.
28.
29.
30.
{
System.out.println("An exception occurred");
}
}
}
(Choose correct one from multiple below)
1. The output is 12 100
2. Compilation error at line 12 because once you chain a DataOutputStream
onto the FileOutputStream, you can't write directly to the
FileOutputStream.
3. An exception occurs at Run time at line 20 because there are only two
bytes written in the file "abc" and the code tries to read a byte and
then an integer.
4. Compilation error occurs at line 20 because there are only two bytes
written in the file "abc" and the code tries to read a byte and then an
integer.
correct is :3
----------------------------------------------------------------------------Question No :71
What will happen when you attempt to compile and run the following code?
public class MyThread extends Thread
{
String myName;
MyThread(String name)
{
myName = name;
}
public void run()
{
for(int i=0; i<100;i++)
{
System.out.println(myName);
}
}
public static void main(String args[])
{
try
{
MyThread mt1 = new MyThread("mt1");
MyThread mt2 = new MyThread("mt2");
mt1.start();
// XXX
mt2.start();
}
catch(InterruptedException ex)
{
}
}
}
(Choose correct one from multiple below)
1. The above code in its current condition will not compile.
2. In order to make the MyThread class prints "mt1" (100 times) followed
by "mt2" (100 times), mt1.join(); can be placed at //XXX position.
3. In order to make the MyThread class prints "mt1" (100 times) followed
by "mt2" (100 times), mt1.sleep(100); can be placed at //XXX position.
4. In order to make the MyThread class prints "mt1" (100 times) followed
by "mt2" (100 times), mt1.run(); can be placed at //XXX position.
correct is :1
----------------------------------------------------------------------------Question No :72
What will be printed to the standard output when the following program
is run and the Test button is pressed 3 times.
import java.awt.*;
import java.awt.event.*;
public class ActionTest extends Frame
{
public ActionTest()
{
Button test=new Button("Test");
add(test);
test.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.out.println("Clicked");
Button b=(Button)e.getSource();
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.out.println("Clicked again");
}
});
}
});
setSize(100,100);
setVisible(true);
setTitle("My Frame");
}
public static void main(String rgs[])
{
new ActionTest();
}
}
(Choose correct one from multiple below)
1. Clicked Clicked again Clicked Clicked again Clicked Clicked again
2. Clicked Clicked Clicked
3. Clicked Clicked Clicked again Clicked Clicked again Clicked again
4. Clicked Clicked again
correct is :3
----------------------------------------------------------------------------Question No :73
What will be output if you try to compile and run the following code, but
there
is no file called Hello.txt in the current directory?
import java.io.*;
public class Test
{
public static void main(String argv[])
{
Test t = new Test();
System.out.println(t.myMethod());
}
public int myMethod()
{
try
{
FileInputStream dis = new
FileInputStream("Hello.txt");
}
catch (FileNotFoundException fne)
{
System.out.println("No such file found");
return -1;
}
catch(IOException ioe)
{
}
finally
{
System.out.println("Doing finally");
}
return 0;
}
}
(Choose correct one from multiple below)
1. No such file found
2. No such file found , -1
3. No such file found, Doing finally, -1
4. 0
correct is :3
----------------------------------------------------------------------------Question No :74
What is the output?
class Bird {
boolean b;
public Bird() {
System.out.println(b);
}
public static void main(String[] args){
Bird b = new Bird();
}
}
(Choose correct one from multiple below)
1. true
2. false
3. garbage
4. none of the above
correct is :2
----------------------------------------------------------------------------Question No :75
What will happen when you attempt to compile and run this code?
public class MyMain{
public static void main(String argv){
System.out.println("Hello cruel world");
}
}
(Choose correct one from multiple below)
1. The compiler will complain that main is a reserved word and cannot be
used for a class
2. The code will compile and when run will print out "Hello cruel world"
3. The code will compile but will complain at run time that no
constructor is defined
4. The code will compile but will complain at run time that main is not
correctly defined
correct is :4
----------------------------------------------------------------------------Question No :76
What can cause a thread to stop executing?
1)
2)
3)
4)
The program exits via a call to System.exit(0);
Another thread is given a higher priority
A call to the thread's stop method.
A call to the halt method of the Thread class?
(Choose correct one from multiple below)
1. 1,2,3
2. 1,2
3. 3,4
4. 2,4
correct is :1
----------------------------------------------------------------------------Question No :77
What will happen when you attempt to compile and run this code?
class Base{
public final void amethod(){
System.out.println("amethod");
}
}
public class Fin extends Base{
public static void main(String argv[]){
Base b = new Base();
b.amethod();
}
}
(Choose correct one from multiple below)
1. Compile time error indicating that a class with any final methods must
be declared final itself
2. Compile time error indicating that you cannot inherit from a class
with final methods
3. Run time error indicating that Base is not defined as final
4. Success in compilation and output of "amethod" at run time
correct is :4
----------------------------------------------------------------------------Question No :78
Which of the following statements are true?
1)
2)
3)
4)
At the root of the collection hierarchy is a class called Collection
The collection interface contains a method called enumerator
The interator method returns an instance of the Vector class
The Set interface is designed for unique elements
(Choose correct one from multiple below)
1. 1
2. 2
3. 3
4. 4
correct is :4
----------------------------------------------------------------------------Question No :79
What best describes the appearance of an application with the following
code?
import java.awt.*;
public class FlowAp extends Frame{
public static void main(String argv[]){
FlowAp fa=new FlowAp();
fa.setSize(400,300);
fa.setVisible(true);
}
FlowAp(){
add(new Button("One"));
add(new Button("Two"));
add(new Button("Three"));
add(new Button("Four"));
}//End of constructor}//End of Application
}
(Choose correct one from multiple below)
1. A Frame with buttons marked One to Four placed on each edge.
2. A Frame with buutons marked One to four running from the top to bottom
3. A Frame with one large button marked Four in the Centre
4. An Error at run time indicating you have not set a LayoutManager
correct is :3
----------------------------------------------------------------------------Question No :80
What will happen when you attempt to compile and run this code?
abstract class Base{
abstract public void myfunc();
public void another(){
System.out.println("Another method");
}
}
public class Abs extends Base{
public static void main(String argv[]){
Abs a = new Abs();
a.amethod();
}
public void myfunc(){
System.out.println("My Func");
}
public void amethod(){
myfunc();
}
}
(Choose correct one from multiple below)
1. The code will compile and run, printing out the words "My Func"
2. The compiler will complain that the Base class has non abstract
methods
3. The code will compile but complain at run time that the Base class has
non abstract methods
4. The compiler will complain that the method myfunc in the base class
has no body, nobody at all to looove it
correct is :1
----------------------------------------------------------------------------Question No :81
Under what circumstances might you use the yield method of the Thread
class
(Choose correct one from multiple below)
1. To call from the currently running thread to allow another thread of
the same or higher priority to run
2. To call on a waiting thread to allow it to run
3. To allow a thread of higher priority to run
4. To call from the currently running thread with a parameter designating
which thread should be allowed to run
correct is :1
----------------------------------------------------------------------------Question No :82
What will be output by the following line of code?
System.out.println(010|4);
(Choose correct one from multiple below)
1. 12
2. 10
3. 11
4. 14
correct is :1
----------------------------------------------------------------------------Question No :83
Which of the following statements about threading are true
1) You can only obtain a mutually exclusive lock on methods in a class
that extends Thread or implements runnable
2) You can obtain a mutually exclusive lock on any object
3) A thread can obtain a mutually exclusive lock on an object by calling
a synchronized method on that object.
4) Thread scheduling algorithms are platform dependent
(Choose correct one from multiple below)
1. 2,3,4
2. 1,2,3,4
3. 1,3
4. 3
correct is :1
----------------------------------------------------------------------------Question No :84
For a class defined inside a method, what rule governs access to the
variables of the enclosing method?
(Choose correct one from multiple below)
1. The class can access any variable
2. The class can only access static variables
3. The class can only access transient variables
4. The class can only access final variables
correct is :4
----------------------------------------------------------------------------Question No :85
Which of the following statements are true
1) An inner class may be defined as static
2) There are NO circumstances where an inner class may be defined as
private
3) A programmer may only provide one constructor for an anonymous class
4) An inner class may extend another class
(Choose correct one from multiple below)
1. 1,4
2. 2,4
3. 1,3
4. 2,3
correct is :1
----------------------------------------------------------------------------Question No :86
What will happen when you attempt to compile and run the following code?
public class Bground extends Thread{
public static void main(String argv[]){
Bground b = new Bground();
b.run();
}
public void start(){
for (int i = 0; i <10; i++){
System.out.println("Value of i = " + i);
}
}
}
(Choose correct one from multiple below)
1. A compile time error indicating that no run method is defined for the
Thread class
2. A run time error indicating that no run method is defined for the
Thread class
3. Clean compile and at run time the values 0 to 9 are printed out
4. Clean compile but no output at runtime
correct is :4
----------------------------------------------------------------------------Question No :87
Which of the following methods are members of the Vector class and allow
you to input a new element
(Choose correct one from multiple below)
1. addElement
2. insert
3. addItem
4. None
correct is :1
----------------------------------------------------------------------------Question No :88
Which of the following best describes the use of the synchronized
keyword?
(Choose correct one from multiple below)
1. Allows two process to run in paralell but to communicate with each
other
2. Ensures only one thread at a time may access a method or object
3. Ensures that two or more processes will start and end at the same time
4. Ensures that two or more Threads will start and end at the same time
correct is :2
----------------------------------------------------------------------------Question No :89
What will happen when you attempt to compile and run the following code
public class Hope{
public static void main(String argv[]){
Hope h = new Hope();
}
protected Hope(){
for(int i =0; i <10; i ++){
System.out.println(i);
}
}
}
(Choose correct one from multiple below)
1. Run time error: Constructors cannot be declared protected
2. Compilation and running with output 0 to 9
3. Compilation and running with output 0 to 10
4. Compilation error: Constructors cannot be declared protected
correct is :2
----------------------------------------------------------------------------Question No :90
Given the following main method in a class called Cycle and a command
line of
java Cycle one two
what will be output?
public static void main(String bicycle[]){
System.out.println(bicycle[0]);}
(Choose correct one from multiple below)
1. one
2. two
3. NULL
4. None
correct is :1
----------------------------------------------------------------------------Question No :91
You want to find out the value of the last element of an array. You write
the following code. What will happen when you compile and run it.?
public class MyAr{
public static void main(String argv[]){
int[] i = new int[5];
System.out.println(i[5]);
}
}
(Choose correct one from multiple below)
1. An error at compile time
2. An error at run time
3. The value 0 will be output
4. The string "null" will be output
correct is :2
----------------------------------------------------------------------------Question No :92
Which of the following statements are correct?
1) If multiple listeners are added to a component only events for the
last listener added will be processed
2) If multiple listeners are added to a component the events will be
processed for all but with no guarantee in the order
3) Adding multiple listeners to a comnponent will cause a compile time
error
4) You may remove as well add listeners to a component.
(Choose correct one from multiple below)
1. 1 and 4
2. 1,2 and 3
3. 2 and 4
4. 2 and 3
correct is :3
----------------------------------------------------------------------------Question No :93
How do you indicate where a component will be positioned using
Flowlayout?
1)
2)
3)
4)
North, South,East,West
Assign a row/column grid reference
Pass a X/Y percentage parameter to the add method
Do nothing, the FlowLayout will position the component
(Choose correct one from multiple below)
1. 1
2. 2
3. 3
4. 4
correct is :4
----------------------------------------------------------------------------Question No :94
Which most closely matches a description of a Java Map?
(Choose correct one from multiple below)
1. A vector of arrays for a 2D geographic representation
2. A class for containing unique array elements
3. A class for containing unique vector elements
4. An interface that ensures that implementing classes cannot contain
duplicate keys
correct is :4
----------------------------------------------------------------------------Question No :95
What will happen when you attempt to compile and run the following code
public class As{
int i = 10;
int j;
char z= 1;
boolean b;
public static void main(String argv[]){
As a = new As();
a.amethod();
}
public void amethod(){
System.out.println(j);
System.out.println(b);
}
}
(Choose correct one from multiple below)
1. Compilation succeeds and at run time an output of 0 and false
2. Compilation succeeds and at run time an output of 0 and true
3. Compile time error b is not initialised
4. Compile time error z must be assigned a char value
correct is :1
----------------------------------------------------------------------------Question No :96
Q.You want to loop through an array and stop when you come to the last
element. Being a good java programmer and forgetting everything you ever
knew about C/C++ you know that arrays contain information about their
size. Which of the following can you use?
(Choose correct one from multiple below)
1. myarray.length();
2. myarray.length;
3. myarray.size
4. myarray.size();
correct is :2
----------------------------------------------------------------------------Question No :97
What will happen when you attempt to compile and run the following code
with the command line "hello there"
public class Arg{String[] MyArg;
public static void main(String argv[]){
MyArg=argv;
}
public void amethod(){
System.out.println(argv[1]);
}
}
(Choose correct one from multiple below)
1. Compile time error
2. Compilation and output of "hello"
3. Compilation and output of "there"
4. None of the above
correct is :1
----------------------------------------------------------------------------Question No :98
Which of the following are methods of the Thread class?
1)
2)
3)
4)
yield()
sleep(long msec)
go()
stop()
(Choose correct one from multiple below)
1. 1,3,4
2. 1,2,4
3. 1,3
4. 3
correct is :2
----------------------------------------------------------------------------Question No :99
What will be output by the following line?
System.out.println(Math.floor(-2.1));
(Choose correct one from multiple below)
1. -2.0
2. -3.0
3. 2.0
4. 3.0
correct is :2
----------------------------------------------------------------------------Question No :100
How does the set collection deal with duplicate elements?
(Choose correct one from multiple below)
1. An exception is thrown if you attempt to add an element with a
duplicate value
2. The add method returns false if you attempt to add an element with a
duplicate value
3. A set may contain elements that return duplicate values from a call to
the equals method
4. Duplicate values will cause an error at compile time
correct is :2
----------------------------------------------------------------------------Question No :101
Given the folowing classes which of the following will compile without
error?
interface IFace{}
class CFace implements IFace{}
class Base{}
public class ObRef extends Base{
public static void main(String argv[]){
ObRef ob = new ObRef();
Base b = new Base();
Object o1 = new Object();
IFace o2 = new CFace();
}
}
1)o1=o2;
2)b=ob;
3)ob=b;
4)o1=b;
(Choose correct one from multiple below)
1. 1,2,4
2. 2,3,4
3. 1,3,4
4. 3,4
correct is :1
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