Download Lecture 2 Slides

CS 116: OBJECT ORIENTED
PROGRAMMING II
LECTURE 2
*Includes materials provided by George Koutsogiannakis and Matt Bauer
1
Review
• In previous lectures we discussed:
– User defined Service classes
• Default constructor/ non default constructor(s).
• Accessor mutator methods.
• toString() method.
• Equals() method
• Other methods as required by the specification.
– Client classes
– How to use a static instance variable.
2
Agenda
• We review the following topics
– Using the scanner object to read text files.
– Scope of variables within the class.
– Useful object methods (equals(), toString())
– Enum data type
– Java Packages
– Javadoc
3
SCANNER CLASS
4
Reading Text Files with Scanner Object
• We need the services of the java.io package and
specifically two classes out of that package:
– File class
– IOException class
• Therefore we need to import those library classes
import java.io.File;
import java.io.IOException;
• Note: Alternatively one can import all the library classes out
of package java.io by typing:
import java.io.*;
5
Reading Text Files with Scanner Object
• Trying to open a file for reading (or writing) can cause
problems (called exceptions)
• What are exceptions?
– “An exception is an event that occurs during the execution of a
program that disrupts the normal flow of instructions.”*
• How do deal with exceptions?
– With Try-Catch statements
• Reasons for exceptions with file read are:
–
–
–
–
File does not exist.
File name was misspelled
File is corrupted.
etc.
6
Reading Text Files with Scanner Object
• Use try and catch to check for exceptions
• Inside the try block:
try
{
File myfile = new File(“NameOfTextFile.txt”); //where to find the file
Scanner scan= new Scanner(myfile); //associates the scanner object
with that file.
//Other code
}
catch (IOException ioe)
{
System.out.println(“Error Occurred”);
}
7
Reading Text Files with Scanner Object
• Create a while loop inside the try block that keeps reading
data until there is no more data to be read.
• The scanner class has methods that allow us to read one
String at a time or one line at a time (as one String).
– Look up the scanner class and its methods in the Java API.
8
Scanner Class hasNext Method
This method detects the end of the input values one String at a time (one
token).
Return type
Boolean
Method name and argument list
hasNext( )
returns true if there is more data to read;
returns false when the end of the file is reached
The hasNext method looks ahead for input.
• An IOException may be generated if we encounter problems reading
the file. Java requires us to acknowledge that these exceptions may
be generated.
• Note that there is another method called hasNextLine() which
returns a boolean and can sense the end of data line by line.
9
Example Reading From File
import java.io.File;
import java.io.IOException;
Import java.util.Scanner;
public class ReadFile {
public static void main(String[] args) {
String str=“ “;
int count=0;
try
{
File myFile=new File(“text.txt”);
Scanner scan=new Scanner(myFile);
while(scan.hasNextLine())
{
str=scan.nextLine();
System.out. println(str);
count++;
// Note that if we want the individual Strings (tokens) inside each line, we need to use the StringTokenizer object
to tokenize the line read during each iteration!!!!
}
} //end of try block of code!!!!!!
catch(IOException ioe)
{ System.out.println(“The file can not be read”); }
System.out.println(“The number of strings tokens read is:”+count);
}
}
10
Scanner Class hasNext… Methods
• Each method returns true if the next token in the
input stream can be interpreted as the data type
requested, and false otherwise.
Return type
Method name and argument list
boolean
hasNextInt( )
boolean
hasNextDouble( )
boolean
hasNextFloat( )
boolean
hasNextByte( )
boolean
hasNextShort( )
boolean
hasNextLong( )
boolean
hasNextBoolean( )
boolean
hasNext( )
11
StringTokenizer
• In the previous example we captured one line of data at a time, from the
text file.
• The String str has the value of the entire line during each cycle in the while
loop (its value changes to the next line during the next cycle).
• Now, we may be interested in the individual Strings that make up the
entire line. Therefore when we capture the line we may want to break it
up into individual tokens.
• To do that we use the StringTokenizer class
12
StringTokenizer
•
•
•
Modifying the program for the StringTokenizer:
First at the top we need to import the library package java.util which contains the
StringTokenizer class.
Then we modify the while loop as follows:
Import java.util.StringTokenizer;
.
.
while(scan.hasNextLine()) //use loop since we are not sure how many tokens in the line
{
str=scan.nextLine();
StringTokenizer strtok=new StringTokenizer(str, “,”); //, is the delimitor
while(strtok.hasMoreTokens())
{
String tokenstr=strtok.nextToken();
//Now, do what you want with the String tokenstr. You may have to
//parse it to another data type depending on what data type you expect.
}
System.out. println(str);
count++;
}
13
Using Split function
• StringTokenizer is a legacy class
• Use Split function of the String class
public String[] split(String regex)
• Splits this string around matches of the
given regular expression.
14
Practice Problem
• Write a program that will read from a text file
and then print out the words, one in each line
– E.g. output of a file containing a line “I love OOPs”
will be
I
Love
OOPs
• You can reuse the program given earlier in
this lecture.
15
Formatting Numbers
• Two types of formatting:
– Formatting a double data type to restrict the
number of decimal points.
– Formatting a decimal number to convert it to a
particular currency like US dollars.
• The first action is done with library class:
DecimalFormat from package java.text
(must import java.text.DecimalFormat)
16
Formatting Numbers
– Create an object of DecimalFormat and in the constructor define the
pattern of decimal points as a String
DecimalFormat df=new DecimalFormat(“0.00”);
The object df can convert double data types to the accuracy of only
two decimal points in this example pattern.
– Suppose we have the decimal data type
double mydoubletype=10.00003;
The code below converts the data type mydoubletype into a new data
type of double type but with a precision of only two decimal points:
double newdoubletype= df.format(mydoubletype);
17
Formatting Numbers
• The conversion to currency is done with library class
NumberFormat of package java.text
(import java.text.NumberFormat;)
– For US dollars: create an object like this:
NumberFormat form=NumberFormat.getCurrencyInstance();
– Use the object form as follows:
String strversionofdouble=form.format(mydoublenumber);
– Notice that the double number held by identifier mydouublenumber is
converted into two decimal points and the $ sign is placed in front of
it. It then it gets assigned to a String type.
– If we want the String strversionofdouble converted back to a double
we need to parse it
18
SCOPE
19
Scope
• Scope of a variable or method refers to the
region of the code where you can access it.
– You will get a compile error if you try to access a
variable/method from beyond its scope
20
Scope: Example
• What is the scope of the variable str?
public class ReadFile {
public static void main(String[] args) {
String str=“ “;
int count=0;
try
{
File myFile=new File(“text.txt”);
Scanner scan=new Scanner(myFile);
while(scan.hasNextLine())
{
str=scan.nextLine();
System.out. println(str);
count++;
}
} //end of try block of code!!!!!!
catch(IOException ioe){
System.out.println(“The file can not be read”); }
System.out.println(“The number of strings tokens read is:”+count);
}
}
21
Scope
• In the previous example the String str was
declared at the top of the main method.
– Therefore we say that the String str has method
scope. That means that the value held by the
identifier str can be seen anywhere from within
the method.
– If, for example, we had declared str inside the
while loop (next slide)
22
Scope: Example
• What is the scope of the variable str?
public class ReadFile {
public static void main(String[] args) {
int count=0;
try
{
File myFile=new File(“text.txt”);
Scanner scan=new Scanner(myFile);
while(scan.hasNextLine())
{
String str=“ “;
str=scan.nextLine();
System.out. println(str);
count++;
}
} //end of try block of code!!!!!!
catch(IOException ioe){
System.out.println(“The file can not be read”); }
System.out.println(“The number of strings tokens read is:”+count);
}
}
Accessing the value of str outside
the while loop would had caused
an error, because the variable’ s str
scope is limited to the while loop
23
Scope: Example
• What is the scope of the variable count?
public class ReadFile {
public static void main(String[] args) {
String str=“ “;
try
{
int count=0;
File myFile=new File(“text.txt”);
Scanner scan=new Scanner(myFile);
while(scan.hasNextLine())
{
str=scan.nextLine();
System.out. println(str);
count++;
}
} //end of try block of code!!!!!!
catch(IOException ioe){
System.out.println(“The file can not be read”);
System.out.println(“The number of strings tokens read is:”+count);
}
System.out.println(“The number of strings tokens read is:”+count);
}
}
Error?
Error?
Yes
Yes
24
Variables and Their Scope
• Types of variables and their scope
– Parameter variables: accessible only within the method
(method scope)
– Local variables: accessible only within the method or code
block (e.g. try and catch block, if..else block, etc)
– Instance variables: have class scope
• Class scope: accessible by any method in the class
– Access by other classes is controlled by the access modifier
25
Scope: Example
• What if we declared the String str outside the main method?
public class ReadFile {
String str=“ “;
public static void main(String[] args) {
try
{
int count=0;
File myFile=new File(“text.txt”);
Scanner scan=new Scanner(myFile);
while(scan.hasNextLine())
{
str=scan.nextLine();
System.out. println(str);
count++;
}
} //end of try block of code!!!!!!
catch(IOException ioe){
System.out.println(“The file can not be read”);
System.out.println(“The number of strings tokens read is:”+count);
}
System.out.println(“The number of strings tokens read is:”+count);
}
}
26
Class Scope
• Notice that in this case we have included
another method in the class besides the main.
• Since the String str is declared outside any
method but inside the class , we say that the
variable str has class scope:
– That means that its value can be seen and it is accessible
by any method in the class!!
– The main method can access it by first instantiating an
object for the class.
27
Class Scope
• Instance variables have class scope
– Any constructor or method of a class can directly
refer to instance variables.
• Methods also have class scope
– Any method or constructor of a class can call any
other method of a class (without using an object
reference).
28
Local Scope
• A method's parameters have local scope, meaning
that:
– a method can directly access its parameters.
– a method's parameters cannot be accessed by other
methods.
• A method can define local variables which also have
local scope, meaning that:
– a method can access its local variables.
– a method's local variables cannot be accessed by other
methods.
29
Example of Class vs local scope
public class Person
{
String firstName;
static int I d;
int currentid;
public Person(){
firstName="John";
id++;
currentid=id;
}
currentid defined in
method1() has local scope
public void method1(){Scope?
int currentid;
currentid = this.currentid*2;
System.out.println("The local value of currentid is"+" "+currentid);
System.out.println("The class scope of variable currentid is"+" "+this.currentid);
}
}
30
Example of Class vs local scope
public class Person
{
String firstName;
static int I d;
int currentid;
public Person(){
firstName="John";
id++;
currentid=id;
}
this.currentid defined as class
attribute has class scope
public void method1(){
Scope?
int currentid;
currentid = this.currentid*2;
System.out.println("The local value of currentid is"+" "+currentid);
System.out.println("The class scope of variable currentid is"+" "+this.currentid);
}
}
31
Example of Class vs local scope
public class Person
{
String firstName;
static int id;
int currentid;
public Person(){
firstName="John";
id++;
currentid=id;
}
public class PersonClient
{
public static void main(String[] args)
{
Person p1=new Person();
Person p2=new Person();
p1.method1();
p2.method1();
}
}
What is the output?
public void method1(){
int currentid;
currentid = this.currentid*2;
System.out.println("The local value of currentid is"+" "+currentid);
System.out.println("The class scope of variable currentid is"+" "+this.currentid);
}
}
32
Example of Class vs Local scope
• ---------- for object p1 ---------– The local value of currentid is 2
– The class scope of variable currentid is 1
• ---------- for object p2 ---------– The local value of currentid is 4
– The class scope of variable currentid is 2
33
Default Initial Values
If the constructor does not assign values to the instance variables, they
receive default values depending on the instance variable data type.
Data Type
byte, short, int, long
float, double
Default Value
0
0.0
char
space
boolean
false
Any object reference (for
example, a String)
null
34
USING OBJECT REFERENCE
35
Object Reference this
• Object Reference: refers to an object instance.
– Used to reference the object’s variables and
methods
• When a method refers to an instance variable
name, this is implied. Thus,
variableName is understood to be this.variableName
Example in the Auto class:
modelName is understood to be this.modelName
36
Using this in a Mutator Method
• To distinguish between method parameter
and instance variable.
Example:
public void setModel( String model )
{
this.model = model;
}
• this.model refers to the instance variable
whose value is being set.
• model refers to the parameter.
37
Using this
• Suppose in AutoClient class (which uses class
Auto) we instantiate an object:
– Auto a1=new Auto(); (globally -outside any
method)
– Suppose that we create a new method that it is
responsible for setting the instance fields of a1
and getting their values by using also a globally
declared parameter i.e int x;
– We can call the value of x using this.x
38
Using this
public class AutoClient
{
Auto a1=new Auto("Ford", “Mario”, 100, 20); //parameters are model, owner, miles driven, gas mileage
int x=300;
public static void main(String[] args) {
AutoClient ac=new AutoClient();
ac.usingThis();
Auto a2=new Auto("Infinity", “Jim”, 150, 18);
300
System.out.println(a2.toString());
?
a2.setCurrentID(15);
System.out.println(“the value of x is:”+ac.x);
}
300
public void usingThis(){
15
a1.setCurrentID(15);
?
int x=a1.getCurrentID();
?
System.out.println("The current id for a1 is now"+" "+this.x);
System.out.println("The value of the current id variable for object a1 is"+" "+x);
}
}
39
Using this
• The output of the previous program is:
C:\CS116\FALL2010\PracticeExercises\Lecture 2\ExampleUsingthis>javac -d
. AutoClient.java
C:\CS116\FALL2010\PracticeExercises\Lecture 2\ExampleUsingthis>java
folder1.folder2.AutoClient
The current id for a1 is now 300
The value of the current id variable for object a1 is15
The model is Infinity The owner is Jim The miles driven are 150.0 The gas
mileage is 18.0 The id is 2
The value of x is:300
40
The equals Method used for objects
• Determines if the data encapsulated in another object is equal
to the data encapsulated in this object.
Return value
Method name and argument list
boolean
equals( Object obj )
returns true if the data in the Object obj
is the same as in this object; false
otherwise
• Example client code using Auto references auto1
and auto2:
if ( auto1.equals( auto2 ) )
System.out.println( "auto1 equals auto2" );
41
The equals Method used for objects
• All java objects regardless if the class is user defined or
pre defined get to use (the term is “inherit”) methods of
a library class called Object.
– All classes get to use (the term is “inherit”) the toString and
equals methods of the Object class.
• We create (as we know) our own toString and equals
methods for objects of our user defined template class.
– When we create our version of a method that already exists in
the library we call the technique “method overriding”.
• Default implementation of equals() of Object class
compares memory location and only return true if two
reference variable are pointing to same memory location
42
The instanceof Operator
• We can use the instanceof operator to determine
if an object reference refers to an object of a
particular class.
• Syntax:
objectReference instanceof ClassName
– evaluates to true if objectReference is of ClassName type; false
otherwise.
• Because the equals method’s parameter is of
type Object, we need to determine if the
parameter is an Auto object. (Object is generalwe need to narrow it down to the specific type of
Object).
43
Auto Class equals Method
(method overriding of Object class’ equals method).
public boolean equals(Object o )
{
// if o is not an Auto object, return false
if ( ! ( o instanceof Auto ) )
return false;
else
{
// type cast o to an Auto object
Auto objAuto = ( Auto ) o;
if ( this.modelName.equals( objAuto.modelName) &&
this.milesDriven== objAuto.milesDriven && Math.abs( this.mileage objAuto.mileage ) < 0.0001 )
return true;
else
return false;
}
}
See text Examples 7.10 Auto.java and 7.11 AutoClient.java
44
ENUM DATATYPE
45
enum Types
• Special data type that allows a variable to be a set
of predefined constants
– Variable’s value must be equal to one of the
predefined contants.
• Built into java.lang (no import statement needed)
• Syntax:
enum EnumName { obj1, obj2,… objn };
• Example:
enum Days { Sun, Mon, Tue, Wed,
Thurs, Fri, Sat };
46
Example enum
enum PersonType { ADULT_MALE, CHILD_MALE, ADULT_FEMALE, CHILD_FEMALE };
public class Persons
{
PersonType pt;
String firstName;
static int id;
int currentid;
public Persons(){
firstName="John";
id++;
currentid=id;
}
public void setPersonType(PersonType pertyp){
this.pt=pertyp;
}
public PersonType getPersonType(){
return pt;
}
}
47
Example enum
enum PersonType { ADULT_MALE, CHILD_MALE, ADULT_FEMALE, CHILD_FEMALE };
public class Persons
{
PersonType pt;
String firstName;
static int id;
int currentid;
What is the output?
public class PersonsClient
{
public static void main(String[] args)
{
public Persons(){
firstName="John";
id++;
currentid=id;
}
public void setPersonType(PersonType pertyp){
this.pt=pertyp;
}
public PersonType getPersonType(){
return pt;
}
}
Persons p1=new Persons();
Persons p2=new Persons();
p1.setPersonType(PersonType.ADULT_FEMALE);
p2.setPersonType(PersonType.CHILD_MALE);
System.out.println("p1 is of person
type:"+" "+p1.getPersonType());
System.out.println("p2 is of person
type:"+" "+p2.getPersonType());
}
}
48
Example enum
– ---------- Output ---------– p1 is of person type: ADULT_FEMALE
– p2 is of person type: CHILD_MALE
49
Useful enum Methods
Return value
Method name and argument list
int
compareTo( Enum eObj )
compares two enum objects and returns a
negative number if this object is less than the
argument, a positive number if this object is
greater than the argument, and 0 if the two
objects are equal.
int
ordinal( )
returns the numeric value of the enum object. By
default, the value of the first object in the list is 0,
the value of the second object is 1, and so on.
boolean
equals( Object eObj )
returns true if this object is equal to the
argument eObj; returns false otherwise
String
toString( )
returns the name of the enum constant
50
Textbook EX 7.17
public class EnumDemo
{
public enum Days { Sun, Mon, Tue, Wed, Thur, Fri,
Sat };
public static void main( String [] args )
{
Days d1, d2; // declare two Days object
references
d1 = Days.Wed;
d2 = Days.Fri;
System.out.println( "Comparing objects using
equals" );
if ( d1.equals( d2 ) )
System.out.println( d1 + " equals " + d2 );
else
System.out.println( d1 + " does not equal " + d2 );
if ( d1.compareTo( d2 ) > 0 )
System.out.println( d1 + " is greater than " + d2 );
else if ( d1.compareTo( d2 ) < 0 )
System.out.println( d1 + " is less than " + d2 );
else
System.out.println( d1 + " is equal to " + d2 );
System.out.println( "\nGetting the ordinal value" );
System.out.println( "The value of " + d1 + " is "
+ d1.ordinal( ) );
System.out.println( "\nConverting a String to an
object" );
Days day = Days.valueOf( "Mon" );
System.out.println( "The value of day is " + day );
}
}
C:>java EnumDemo
The value of d1 is Wed
The value of d2 is Fri
Comparing objects using equals
Wed does not equal Fri
Comparing objects using compareTo
Wed is less than Fri
Getting the ordinal value
The value of Wed is 3
Converting a String to an object
The value of day is Mon
51
Textbook EX 7.17
public class EnumDemo
declaration
{
public enum Days { Sun, Mon, Tue, Wed, Thur, Fri,
Sat };
public static void main( String [] args )
{
Days d1, d2; // declare two Days object
references
d1 = Days.Wed;
d2 = Days.Fri;
System.out.println(
"Comparing objects using
3==5?
equals" );
if ( d1.equals( d2 ) )
System.out.println( d1 + " equals " + d2 );
else
(3-5) > 0?
System.out.println( d1 + " does not equal " + d2 );
if ( d1.compareTo( d2 ) > 0 )
System.out.println( d1 + " is greater than " + d2 );
else if ( d1.compareTo( d2 ) < 0 )
System.out.println( d1 + " is less than " + d2 );
else
System.out.println( d1 + " is equal to " + d2 );
System.out.println( "\nGetting the ordinal value" );
System.out.println( "The value of " + d1 + " is "
+ d1.ordinal( ) );
System.out.println( "\nConverting a String to an
object" );
Days day = Days.valueOf( "Mon" );
System.out.println( "The value of day is " + day );
}
}
Evokes day.toString()
C:>java EnumDemo
The value of d1 is Wed
The value of d2 is Fri
Comparing objects using equals
Wed does not equal Fri
Comparing objects using compareTo
Wed is less than Fri
Getting the ordinal value
The value of Wed is 3
Converting a String to an object
The value of day is Mon
52
JAVA PACKAGES
53
Java Packages
• A package is a collection of classes.
– Gives organization and structure to our application program
• Packages can contain classes that are used by the package
but are not visible or accessible outside the package.
• Different packages can have classes with the same name.
• User defined packaging.
– Suppose that we created a package for our service class Auto :
package name1.name2.name3;
import java.util.Scanner;
public class Auto
{
………………………………
}
54
Java Packages
• Compile using the switch “-d”:
• >javac –d . Auto.java
Notice that there is space between javac and –d and also between –d and
the dot. There is also space between the dot and the name of the file.
• This command tells the compiler to create sub-folders fror
placing the class files
• It first creates sub-folder “name1” then “name 2” (inside
“name1” folder) and then “name3” (inside “name2” folder)
with respect to the current directory
• and place Auto.class inside folder “name3”.
55
Java Packages
Current Directory (folder)
Source code
files
Auto.java
AutoClient.java
are in Current
Directory
name1(folder)
name2 (folder)
name3 (folder)
Auto.class
56
Java Packages
• The service class Auto.class file is in folder
“./name1/name2/name3” in our example.
• Suppose that we want to use the class Auto in the class AutoClient
which is in package name1.name2
• Place AutoClient class in the sub-folder name2 (not the same folder
as the Auto class):
• You can use Auto class in AutoClient in two ways:
[Use the full name of the class]
package name1.name2;
public class AutoClient
{
name1.name2.name3.Auto fiatCar = new name1.name2.name3.Auto();
………………………………
}
57
Java Packages
• You can use Auto class in AutoClient in two
ways (cont.)
[Use import statement]
package name1.name2;
import name1.name2.name3.Auto;
public class AutoClient
{
Auto fiatCar = new Auto();
………………………………
}
–Note: If both classes reside in the same folder then there is no need
to import the Auto class
58
Java Packages
Current Directory (folder)
Auto.java
,
AutoClient.java
name1(folder)
name2 (folder)
AutoClient.class
name3 (folder)
Auto.class
59
Java Packages
• How do we call the interpreter for class
AutoClient from the current directory (folder)?
• We need to list the path to the AutoClass
when we use the interpreter command:
i.e >java name1.name2.AutoClient
• Notice that the reason we call the AutoClient class is
because this class has the main method. The Auto
class will be called automatically.
60
Java Packages
• Pre defined library classes are grouped into packages
according to their functionality:
i.e. package java.lang
• Provides classes that are fundamental to the design
of the Java programming language.
• Every java program automatically imports all the classes of
this package without the need for an import statement.
–
Includes such classes as :
• String, Math , System, Integer, Float and others.
61
Java Packages
package java.util
– Must explicitly be imported with an import
statement.
– Provides such classes as:
• Scanner, StringTokenizer, Vector, Calendar, Date and
others.
java.text
– Must imported explicitly.
– Provides numeric formatting classes such as:
• Format, NumberFormat and others
62
Java Packages
• Import statements can include the entire package or
a selective class out of the package
i.e.
import java.util.*;
imports all classes in package util
or
import java.util.Scanner;
imports only the Scanner class (saves memory usage)
63
Java Packages
• There are over 200 packages in the java library
– Number of classes varies in each package with
some having over 20 classes.
– Remember that a package can include something
called “interfaces”.
– For now let us think of an interface as a class whose
methods have no code (no implementation). We will come
back to the subject of interfaces later.
64
JAVA DOCS
65
Javadocs
• Automatic generation of documentation for your
user defined classes in html format.
• It is another tool available in the jdk (see bin
subfolder in the installation folder of the jdk).
• To generate documentation use the command
javadoc and the nam eof your class followed by
the .java extension:
– >javadoc Persons.java or
– >javadoc *.java (means all files in the folder that
end with .java extansion).
66
Javadocs
• The tool reads all comments added (/** to */)
• plus additional information that we add in the
source code file (i.e. describe method
parameters and return using the symbol @)
i.e.
– @param id denotes the id number of a person advancing
for each new Person object instantiated.
– @return method return a String
67
Javadoc Example
/** This class describes Persons */
public class Person
{
/**
@param firstName provides the first name of a Person
*/
String firstName;
static int id;
int currentid;
public Person()
{
firstName="John";
id++;
currentid=id;
}
}
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Output html File
•
•
•
•
•
•
•
•
•
Package Class Tree Deprecated Index Help
PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes All Classes
SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD
Class Person
java.lang.Object Person public class Person extends java.lang.Object This class describes Persons
Constructor Summary Person()
Method Summary void method1()
Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll,
toString, wait, wait, wait
Constructor Detail Person
public Person() Method Detail method1
public void method1() Package Class Tree Deprecated Index Help
PREV CLASS NEXT CLASS FRAMES NO FRAMES All Classes All Classes
SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD
69