Java Programming Language Mr.Rungrote Phonkam

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1 7 Java Programming Language Mr.Rungrote Phonkam

2 Contents 1. Method Member #2 2. Constructor 3. Finalize 4. Mutation and Assessor Method 5. Overloading 6. Static Scope 7. Inner Class

3 1. Method Member #2 กก ก Copy Value Parameter Reference Parameter Data ก ก ก ก ก ก ก return

4 1. Method Member #2 ก ก Access_Level final static Return_Type Method_Name ( Argument_List ) { Statements return Expression

5 1. Method Member #2 1 void methoda ( ) { 2 void methodb (int a) {

6 1. Method Member #2 3 void methodc (char c, Double obj) { 4 int methodd (Float f) { return 15;

7 1. Method Member #2 5 Double methode (Double obj) { return new Double(12.45); 6 String methodg () {.. return new Double(12.45);...

8 2. Constructors ก ก ก ก Data ก ก ก ก ก ก ก ก ก ก ก ก ก

9 2. Constructors 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( );

10 2. Constructors java MyPen Pen is RED pen is BLUE

11 3. Finalize ก กก กก ก กก ก Garbage Collector C++ ก กก กก Deconstructor ก free ก

12 3. Finalize ก A. ก B. ก C. D. ก

13 3. Finalize ก ( ก ก ก ) A. ก B. ก C. D. ก

14 3. Finalize 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);

15 3. Finalize javac deprecation FileName.java java MyConnection

16 (Mutation) 4. Mutation and Assessor ก ก ก Data ก ก ก Data set setdata( ) (Assessor) ก ก ก Data ก ก ก Data get getdata( )

17 4. Mutation and Assessor 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( ) );

18 4. Mutation and Assessor java MyBaby Somchai Male My Son is Somchai java MyBaby Somsrt Female My Daughter is Somsri

19 5. Overloading ก ก ก ก ก ก ก ก methoda(int a) ก methodb(char ch) methoda(int a) ก methodb(int a, int b) ก ก

20 5. Overloading 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);

21 5. 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();

22 5. Overloading java AirLine Captain Name Peter Anderson Amount of Seat 50 Amount of Air-Hostess 5 Captain Name Sompong N. Lumpang

23 5. Overloading 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);

24 5. Overloading 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();

25 6. Static Block ก ก (Static Block) ก static ก ก ก ก ก (Initialization) ก ก ก ก Bytecodes JVM class Class_Name { static {

26 6. Static Block class Employee { String name; long salary; short employee_number; static int total_payroll; static { System.out.println( Calculating payroll total ); salary = 3000;

27 7. Static Class ก (Static Class) ก Constructors, Method, Data Member ก กก static ก this class Outer_Class_Name { static class Inner_Class_Name{..

28 8. Inner Class (Inner Class) 3 Member Class กก ( ก Data Method) Local Class Method Anonymous Class

29 8. Inner Class ก Parent ก ก ก ก ก GUI Event Handler

30 8.1. Member Class 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;

31 8.2. 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() );

32 ก f.class f$1$myinnerbhclass.class 8.2. Local Class

33 8.3. 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

34 8.3. Anonymous Class ก f.class f$1.class

Java Programming Language Mr.Rungrote Phonkam

3 Java Programming Language Mr.Rungrote Phonkam rungrote@it.kmitl.ac.th Contents 1. Identify 2. Method Member 3. Literals 4. Data Type 6. Variable 1. Identify ก ก Class, Data, Method, Variable, Label,