Java Programming Language Mr.Rungrote Phonkam rungrote...
Transcript of Java Programming Language Mr.Rungrote Phonkam rungrote...
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ContentsContents
1. Method Member #22. Constructor3. Finalize4. Mutation and Assessor Method5. Overloading6. Static Scope7. Inner Class
1. Method Member #22. Constructor3. Finalize4. Mutation and Assessor Method5. Overloading6. Static Scope7. Inner Class
Java Programming Language by Rungrote Phonkam
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1. Method Member #21. Method Member #21. Method Member #2
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1. Method Member #21. Method Member #21. Method Member #2
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Java Programming Language by Rungrote Phonkam
Access_Level final static Return_Type Method_Name ( Argument_List ){
Statementsreturn Expression
}
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1. Method Member #21. Method Member #21. Method Member #2
Java Programming Language by Rungrote Phonkam
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void methodA ( ){ … }
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void methodA ( ){ … }
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void methodB (int a){ … }
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void methodB (int a){ … }
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1. Method Member #21. Method Member #21. Method Member #2
Java Programming Language by Rungrote Phonkam
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void methodC (char c, Double obj){ … }
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void methodC (char c, Double obj){ … }
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int methodD (Float f){ …
return 15;}
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int methodD (Float f){ …
return 15;}
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1. Method Member #21. Method Member #21. Method Member #2
Java Programming Language by Rungrote Phonkam
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Double methodE (Double obj){ …
return new Double(12.45);}
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Double methodE (Double obj){ …
return new Double(12.45);}
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String methodG (){ … ..
return new Double(12.45);…...
}
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String methodG (){ … ..
return new Double(12.45);…...
}
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2. Constructors2. Constructors2. Constructors
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2. Constructors2. Constructors2. Constructorsclass Pen{ private String color;
Pen(String c) { color = c; }public void printPenColor( ){ System.out.println(“Pen is “ + color); }
}class MyPen{ public static void main(String args[])
{ Pen Pen1 = new Pen(“RED”);Pen Pen2 = new Pen(“BLUE”);Pen1.printPenColor( ); Pen2.printPenColor( );
}}
class Pen{ private String color;
Pen(String c) { color = c; }public void printPenColor( ){ System.out.println(“Pen is “ + color); }
}class MyPen{ public static void main(String args[])
{ Pen Pen1 = new Pen(“RED”);Pen Pen2 = new Pen(“BLUE”);Pen1.printPenColor( ); Pen2.printPenColor( );
}}
Java Programming Language by Rungrote Phonkam
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2. Constructors2. Constructors2. Constructors
Java Programming Language by Rungrote Phonkam
java MyPenPen is REDpen is BLUE
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3. Finalize3. Finalize3. Finalize
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3. Finalize3. Finalize3. Finalize
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3. Finalize3. Finalize3. Finalize
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3. Finalize3. Finalize3. Finalizeclass Connection{ Connection( )
{ System.out.print(" Connecting\n"); }void SendData( ){ System.out.print(" Sending\n"); }protected void finalize( ) throws Throwable{ System.out.print(" Closing\n"); }
}class MyConnection{ public static void main(String args[])
{ Connection conn = new Connection( );conn.SendData( );System.runFinalizersOnExit(true);
}}
class Connection{ Connection( )
{ System.out.print(" Connecting\n"); }void SendData( ){ System.out.print(" Sending\n"); }protected void finalize( ) throws Throwable{ System.out.print(" Closing\n"); }
}class MyConnection{ public static void main(String args[])
{ Connection conn = new Connection( );conn.SendData( );System.runFinalizersOnExit(true);
}}
Java Programming Language by Rungrote Phonkam
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3. Finalize3. Finalize3. Finalize
Java Programming Language by Rungrote Phonkam
javac –deprecation FileName.javajava MyConnection
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4. Mutation and Assessor4. Mutation and Assessor4. Mutation and Assessor
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Java Programming Language by Rungrote Phonkam
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4. Mutation and Assessor4. Mutation and Assessor4. Mutation and Assessorclass Baby{ private String name;
private char gender;void setName(String n) { name = n; }String getName ( ) { return name; }void setGender(char g) { gender = g; }char getGender ( ) { return gender; }
}class MyBaby{ public static void main(String args[])
{ Baby Kid = new Baby( );Kid.setName(args[0]);Kid.setGender(args[1].charAt(0));if (Kid.getGender( )=='M')
System.out.print("My Son is ");else System.out.print("My Daughter is ");System.out.print(Kid.getName( ) ); }
}
class Baby{ private String name;
private char gender;void setName(String n) { name = n; }String getName ( ) { return name; }void setGender(char g) { gender = g; }char getGender ( ) { return gender; }
}class MyBaby{ public static void main(String args[])
{ Baby Kid = new Baby( );Kid.setName(args[0]);Kid.setGender(args[1].charAt(0));if (Kid.getGender( )=='M')
System.out.print("My Son is ");else System.out.print("My Daughter is ");System.out.print(Kid.getName( ) ); }
}
Java Programming Language by Rungrote Phonkam
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4. Mutation and Assessor4. Mutation and Assessor4. Mutation and Assessor
Java Programming Language by Rungrote Phonkam
java MyBaby Somchai MaleMy Son is Somchaijava MyBaby Somsrt FemaleMy Daughter is Somsri
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5. Overloading5. Overloading5. Overloading
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5. Overloading5. Overloading5. Overloadingclass Flight1{ String captain_name; int qty_hostess, qty_seat;
void FlightTeam(String n, int h, int s){ captain_name = n; qty_hostess = h; qty_seat = s; }void FlightTeam(String n) { captain_name = n; }void FlightTeam(int s, int h, String n){ captain_name = n; qty_hostess = h; qty_seat = s; }void printInfo( ){ System.out.println("Captain Name \t\t" + captain_name);
System.out.println("Amount of Seat \t\t" + qty_seat);System.out.println("Amount of Air-Hostess\t" + qty_hostess);
}}
class Flight1{ String captain_name; int qty_hostess, qty_seat;
void FlightTeam(String n, int h, int s){ captain_name = n; qty_hostess = h; qty_seat = s; }void FlightTeam(String n) { captain_name = n; }void FlightTeam(int s, int h, String n){ captain_name = n; qty_hostess = h; qty_seat = s; }void printInfo( ){ System.out.println("Captain Name \t\t" + captain_name);
System.out.println("Amount of Seat \t\t" + qty_seat);System.out.println("Amount of Air-Hostess\t" + qty_hostess);
}}
Java Programming Language by Rungrote Phonkam
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5. Overloading5. Overloading5. Overloading
class AirLine{ public static void main(String args[])
{ Flight1 f1 = new Flight1();Flight1 f2 = new Flight1();Flight1 f3 = new Flight1();f1.FlightTeam("Peter Anderson", 5, 50);f2.FlightTeam("Sompong N. Lumpang");f3.FlightTeam(120, 10, "Alen Tangee");f1.printInfo(); f2.printInfo(); f3.printInfo();
}}
class AirLine{ public static void main(String args[])
{ Flight1 f1 = new Flight1();Flight1 f2 = new Flight1();Flight1 f3 = new Flight1();f1.FlightTeam("Peter Anderson", 5, 50);f2.FlightTeam("Sompong N. Lumpang");f3.FlightTeam(120, 10, "Alen Tangee");f1.printInfo(); f2.printInfo(); f3.printInfo();
}}
Java Programming Language by Rungrote Phonkam
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5. Overloading5. Overloading5. Overloading
Java Programming Language by Rungrote Phonkam
java AirLineCaptain Name Peter AndersonAmount of Seat 50Amount of Air-Hostess 5Captain Name Sompong N. Lumpang
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5. Overloading5. Overloading5. Overloadingclass Flight2{ String captain_name;
int qty_hostess, qty_seat;Flight2(String n, int h, int s){ captain_name = n; qty_hostess = h; qty_seat = s; }Flight2(String n){ captain_name = n; }Flight2(int s, int h, String n){ captain_name = n; qty_hostess = h; qty_seat = s; }void printInfo( ){ System.out.println("Captain Name \t\t" + captain_name);
System.out.println("Amount of Seat \t\t" + qty_seat);System.out.println("Amount of Air-Hostess\t" + qty_hostess);
}}
class Flight2{ String captain_name;
int qty_hostess, qty_seat;Flight2(String n, int h, int s){ captain_name = n; qty_hostess = h; qty_seat = s; }Flight2(String n){ captain_name = n; }Flight2(int s, int h, String n){ captain_name = n; qty_hostess = h; qty_seat = s; }void printInfo( ){ System.out.println("Captain Name \t\t" + captain_name);
System.out.println("Amount of Seat \t\t" + qty_seat);System.out.println("Amount of Air-Hostess\t" + qty_hostess);
}}
Java Programming Language by Rungrote Phonkam
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5. Overloading5. Overloading5. Overloadingclass AirLine{ public static void main(String a[])
{ Flight2 f1 = new Flight2("Peter Anderson", 5, 50);Flight2 f2 = new Flight2("Sompong N. Lumpang");Flight2 f3 = new Flight2(120, 10, "Alen Tangee");f1.printInfo(); f2.printInfo(); f3.printInfo();
}}
class AirLine{ public static void main(String a[])
{ Flight2 f1 = new Flight2("Peter Anderson", 5, 50);Flight2 f2 = new Flight2("Sompong N. Lumpang");Flight2 f3 = new Flight2(120, 10, "Alen Tangee");f1.printInfo(); f2.printInfo(); f3.printInfo();
}}
Java Programming Language by Rungrote Phonkam
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6. Static Block6. Static Block6. Static Block
������ ��� (Static Block)
� ��$�� �!'5��������������&#��#��&���� static
� ����(*�������#* "�#���'�� �'0����,���� (*����������!���������� �������� (Initialization)
� (*������������������������'�������'�-��)/'� Bytecodes �����* JVM
������class Class_Name {
static { … }}
������ ��� (Static Block)
� ��$�� �!'5��������������&#��#��&���� static
� ����(*�������#* "�#���'�� �'0����,���� (*����������!���������� �������� (Initialization)
� (*������������������������'�������'�-��)/'� Bytecodes �����* JVM
������class Class_Name {
static { … }}
Java Programming Language by Rungrote Phonkam
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6. Static Block6. Static Block6. Static Blockclass Employee{ String name;
long salary;short employee_number;
static int total_payroll;
static{ System.out.println(“Calculating payroll total “);
salary = 3000;}
}
class Employee{ String name;
long salary;short employee_number;
static int total_payroll;
static{ System.out.println(“Calculating payroll total “);
salary = 3000;}
}
Java Programming Language by Rungrote Phonkam
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7. Static Class7. Static Class7. Static Class
������� �� (Static Class)
� ������!��������������'�� ������#(�� Constructors, Method, Data
Member ����#* "�#�� �����4+�!����$%�������������
� (*�����������"�#���'�� ���������&#��#��&���� static
� ������� &��!��#��&���� this ) )��
������class Outer_Class_Name {
static class Inner_Class_Name{ … }…..
}
������� �� (Static Class)
� ������!��������������'�� ������#(�� Constructors, Method, Data
Member ����#* "�#�� �����4+�!����$%�������������
� (*�����������"�#���'�� ���������&#��#��&���� static
� ������� &��!��#��&���� this ) )��
������class Outer_Class_Name {
static class Inner_Class_Name{ … }…..
}
Java Programming Language by Rungrote Phonkam
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8. Inner Class8. Inner Class8. Inner Class
������� �� (Inner Class)
� �! ��$%� 3 �!!� Member Class
�'�����(*�������)&�"�#���'�� (�0��!���#&��! Data �'0Method)
� Local Class
�'����������)&�"�#�� Method
� Anonymous Class
�'�������������&#���������������������
������� �� (Inner Class)
� �! ��$%� 3 �!!� Member Class
�'�����(*�������)&�"�#���'�� (�0��!���#&��! Data �'0Method)
� Local Class
�'����������)&�"�#�� Method
� Anonymous Class
�'�������������&#���������������������
Java Programming Language by Rungrote Phonkam
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8. Inner Class8. Inner Class8. Inner Class
� ) ����(����(��)��"�#�����&�'������$%� Parent
� ���0��!���������'�������������) ��� (*�������������������0!! GUI �� �������! Event Handler
� ) ����(����(��)��"�#�����&�'������$%� Parent
� ���0��!���������'�������������) ��� (*�������������������0!! GUI �� �������! Event Handler
Java Programming Language by Rungrote Phonkam
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8.1. Member Class8.1. Member Class8.1. Member Classclass top {
int I=33;
class myNested {int k=I;void foo() { }
}
void bar() {myNested mn1 = new myNested();myNested mn2 = new myNested();mn1.k = 564 * mn2.k;
}}
class top {int I=33;
class myNested {int k=I;void foo() { }
}
void bar() {myNested mn1 = new myNested();myNested mn2 = new myNested();mn1.k = 564 * mn2.k;
}}
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8.2. Local Class8.2. Local Class8.2. Local Class//<applet code=f.class height=100 width=200> </applet>
import java.applet.*;import java.awt.*;import java.awt.event.*;public class f extends Applet {
Button apple = new Button("press me");public void init() {
class MyinnerBHClass implements java.awt.event.ActionListener{ int i=1;
public void actionPerformed(ActionEvent e){ System.out.println("button pressed "+ i++ +" times"); }
}
add(apple);apple.addActionListener( new MyinnerBHClass() );
}}
//<applet code=f.class height=100 width=200> </applet>import java.applet.*;import java.awt.*;import java.awt.event.*;public class f extends Applet {
Button apple = new Button("press me");public void init() {
class MyinnerBHClass implements java.awt.event.ActionListener{ int i=1;
public void actionPerformed(ActionEvent e){ System.out.println("button pressed "+ i++ +" times"); }
}
add(apple);apple.addActionListener( new MyinnerBHClass() );
}}
Java Programming Language by Rungrote Phonkam
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8.2. Local Class8.2. Local Class8.2. Local Class
�����������
• f.class• f$1$MyinnerBHClass.class
�����������
• f.class• f$1$MyinnerBHClass.class
Java Programming Language by Rungrote Phonkam
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8.3. Anonymous Class8.3. Anonymous Class8.3. Anonymous Class//<applet code=f2.class height=100 width=200> </applet>import java.applet.*;import java.awt.*;import java.awt.event.*;public class f2 extends Applet {
Button apple = new Button("press me");public void init() {
add(apple);apple.addActionListener(
new ActionListener(){ public void actionPerformed(ActionEvent e)
{ System.out.println( e.paramString() + " pressed"); }} // end anon class
); // end method call}
}
//<applet code=f2.class height=100 width=200> </applet>import java.applet.*;import java.awt.*;import java.awt.event.*;public class f2 extends Applet {
Button apple = new Button("press me");public void init() {
add(apple);apple.addActionListener(
new ActionListener(){ public void actionPerformed(ActionEvent e)
{ System.out.println( e.paramString() + " pressed"); }} // end anon class
); // end method call}
}
Java Programming Language by Rungrote Phonkam
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8.3. Anonymous Class8.3. Anonymous Class8.3. Anonymous Class
�����������
• f.class• f$1.class
�����������
• f.class• f$1.class
Java Programming Language by Rungrote Phonkam