81-90 PROGRAMS

81  Program to demonstrate an Adapter

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class AdapterDemo extends Applet {

public void init() {

addMouseListener(new MyMouseAdapter(this));

addMouseMotionListener(new MyMouseMotionAdapter(this));

}}

class MyMouseAdapter extends MouseAdapter{

AdapterDemo adapterDemo;

public MyMouseAdapter(AdapterDemo adapterDemo) {

this.adapterDemo = adapterDemo;

}

public void mouseClicked(MouseEvent me) {

adapterDemo.showStatus("Mouse clicked");

}}

class MyMouseMotionAdapter extends MouseMotionAdapter{

AdapterDemo adapterDemo;

public MyMouseMotionAdapter(AdapterDemo adapterDemo) {

this.adapterDemo = adapterDemo;

}

public void mouseDragged(MouseEvent me) {

adapterDemo.showStatus("Mouse dragged");

}}

82  Program to Demonstrate Button

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class demobutton extends Applet implements ActionListener

{

String msg="";

Button b1,b2;

public void init()

{

b1=new Button("OK");

b2=new Button("CANCEL");

add(b1);

add(b2);

b1.addActionListener(this);

b2.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{

   String s=e.getActionCommand();

if(s.equals("OK"))

{

   msg="You pressed OK";

}

else

{

  msg="You pressed CANCEL";

}

repaint();

}

public void paint(Graphics g){

g.drawString(msg,40,40);

}

}

83  Program to Demonstrate Checkbox

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class democheckbox extends Applet implements ItemListener {

String msg="";

Checkbox c1,c2,c3;

public void init() {

c1=new Checkbox("JAVA",null,true);

c2=new Checkbox("VB");

c3=new Checkbox("ORACLE");

add(c1);

add(c2);

add(c3);

c1.addItemListener(this);

c2.addItemListener(this);

c3.addItemListener(this);

 }

public void itemStateChanged(ItemEvent e) {

repaint();

}

public void paint(Graphics g) {

msg="JAVA:"+c1.getState();

g.drawString(msg,40,40);

msg="VB:"+c2.getState();

g.drawString(msg,40,60);

msg="ORACLE:"+c3.getState();

g.drawString(msg,40,80);

}}

84  Program to Demonstrate Radio Buttons (CheckboxGroup)

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class democheckboxgrp extends Applet implements ItemListener {

String msg="";

Checkbox c1,c2,c3;

CheckboxGroup cg;

public void init() {

cg=new CheckboxGroup();

c1=new Checkbox("JAVA",cg,true);

c2=new Checkbox("VB",cg,false);

c3=new Checkbox("ORACLE",cg,false);

add(c1);

add(c2);

add(c3);

c1.addItemListener(this);

c2.addItemListener(this);

c3.addItemListener(this);

}

public void itemStateChanged(ItemEvent e) {

repaint();

}

public void paint(Graphics g) {

msg="curently selected:"+cg.getSelectedCheckbox().getLabel();

g.drawString(msg,40,40);

}

}

85   Program to Demonstrate Choice

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class demochoice extends Applet implements ItemListener {

Choice c;

public void init() {

c=new Choice();

c.addItem("Red");

c.addItem("Green");

c.addItem("Blue");

add(c);

c.addItemListener(this); }

public void itemStateChanged(ItemEvent e) {

String st=c.getSelectedItem();

if(st.equals("Red")) {

setBackground(Color.red); }

if(st.equals("Green")) {

setBackground(Color.green); }

if(st.equals("Blue")) {

setBackground(Color.blue);}}}

86  Program to Demonstrate File Dialog

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

class TestMenu extends Frame {

   String msg="";

CheckboxMenuItem workoff;

TestMenu(String title) {

  super(title);

MenuBar mbar=new MenuBar();

setMenuBar(mbar);

Menu file=new Menu("File");

MenuItem i1,i2,i3,i4,i5;

file.add(i1=new MenuItem("New...."));

file.add(i2=new MenuItem("Open...."));

file.add(i3=new MenuItem("Save...."));

file.add(i4=new MenuItem("-"));

file.add(i5=new MenuItem("Quit...."));

mbar.add(file);

Menu edit=new Menu("Edit");

MenuItem i6,i7,i8,i9;

edit.add(i6=new MenuItem("Cut...."));

edit.add(i7=new MenuItem("Copy...."));

edit.add(i8=new MenuItem("Paste...."));

edit.add(i9=new MenuItem("-"));

Menu submenu1=new Menu("Text Size...");

MenuItem i10,i11;

submenu1.add(i10=new MenuItem("Large...."));

submenu1.add(i11=new MenuItem("Small...."));

edit.add(submenu1);

workoff=new CheckboxMenuItem("Work Offline");

edit.add(workoff);

mbar.add(edit);

Mymenuhandler handler=new Mymenuhandler(this);

i1.addActionListener(handler);

i2.addActionListener(handler);

i3.addActionListener(handler);

i5.addActionListener(handler);

i6.addActionListener(handler);

i7.addActionListener(handler);

i8.addActionListener(handler);

i10.addActionListener(handler);

i11.addActionListener(handler);

workoff.addItemListener(handler);

}

public void paint(Graphics g) {

g.drawString(msg,10,100);

if(workoff.getState())

  g.drawString("Checked",10,200);

 else

g.drawString("Unchecked",10,200);

}}

class Mymenuhandler implements ActionListener,ItemListener{

   TestMenu tm;

  Mymenuhandler(TestMenu tm) {

 this.tm=tm;

}

public void actionPerformed(ActionEvent ae) {

  String msg=" You selected";

    String s=ae.getActionCommand();

if(s.equals("New...."))

    msg="New";

  else if(s.equals("Quit....")) {

        TestDialog d=new TestDialog(tm,"Confirm Exit Dialog");

     d.setVisible(true);

 }

  else if(s.equals("Open....")) {

    FileDialog fopen=new FileDialog(tm,"Open a File",FileDialog.LOAD);

    fopen.setVisible(true);

   msg="You selected "+fopen.getDirectory()+"  "+fopen.getFile();

  }

else if(s.equals("Save....")) {

    FileDialog fsave=new FileDialog(tm,"Save a File",FileDialog.SAVE);

    fsave.setVisible(true);

  }}

public void itemStateChanged(ItemEvent ie) {

tm.repaint();

}}

class TestDialog extends Dialog implements ActionListener {

Frame f;

String s;

Button b,b1;

TestDialog(Frame f,String title) {

   super(f,title,false);

   this.f=f;

    this.s=title;

 setLayout(new FlowLayout());

  setSize(200,400);

 add(new Label("Are you sure you want to exit"));

     add(b=new Button("Yes"));

  add(b1=new Button("No"));

b.addActionListener(this);

b1.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

  if(e.getSource() == b){

dispose();

f.setVisible(false);

}

else  {

dispose();

}}}

public class DemoFileDialog extends Applet {

Frame f;

public void init() {

  f=new TestMenu("My Menu Frame");

  f.setSize(300,500);

  f.setVisible(true); }

public void start() {

  f.setVisible(true);

}

public void stop() {

  f.setVisible(false);

}}

87  Program to Demonstrate Labels

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class demolabel extends Applet

{

public void init()

{

Label nm=new Label("Name");

Label addr=new Label("Address");

//add labels to window

add(nm);

add(addr);

}

}

88  Program to Demonstrate Lists

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class ListDemo extends Applet implements ActionListener {

List os,browser;

String msg= "";

public void init() {

os=new List(4,true);

browser=new List(4,false);

os.add("windows 98");

os.add("Windows NT");

os.add("Solaris");

os.add("MacOS");

browser.add("Netscape 1.1");

browser.add("Netscape 2.x");

browser.add("Netscape 3.x");

browser.add("Netscape 4.x");

browser.add("Internet Explorer 2.0");

browser.add("Internet Explorer 3.0");

browser.add("Internet Explorer 4.0");

browser.add("Lynx 2.4");

browser.select(1);

add(os);

add(browser);

os.addActionListener(this);

browser.addActionListener(this);

}

public void actionPerformed(ActionEvent ae) {

repaint();

}

public void paint(Graphics g) {

int idx[];

msg="Current OS:";

idx=os.getSelectedIndexes();

for(int i=0; i

msg += os.getItem(idx[i]) + " ";

g.drawString(msg,6,120);

msg="Current Browser: ";

msg += browser.getSelectedItem();

g.drawString(msg,6,140);

}}

89  Program to Demonstrate Menu

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

class TestMenu extends Frame {

   String msg="";

CheckboxMenuItem workoff;

TestMenu(String title) {

  super(title);

MenuBar mbar=new MenuBar();

setMenuBar(mbar);

Menu file=new Menu("File");

MenuItem i1,i2,i3,i4,i5;

file.add(i1=new MenuItem("New...."));

file.add(i2=new MenuItem("Open...."));

file.add(i3=new MenuItem("Close...."));

file.add(i4=new MenuItem("-"));

file.add(i5=new MenuItem("Quit...."));

mbar.add(file);

Menu edit=new Menu("Edit");

MenuItem i6,i7,i8,i9;

edit.add(i6=new MenuItem("Cut...."));

edit.add(i7=new MenuItem("Copy...."));

edit.add(i8=new MenuItem("Paste...."));

edit.add(i9=new MenuItem("-"));

Menu submenu1=new Menu("Text Size...");

MenuItem i10,i11;

submenu1.add(i10=new MenuItem("Large...."));

submenu1.add(i11=new MenuItem("Small...."));

edit.add(submenu1);

workoff=new CheckboxMenuItem("Work Offline");

edit.add(workoff);

mbar.add(edit);

Mymenuhandler handler=new Mymenuhandler(this);

i1.addActionListener(handler);

i2.addActionListener(handler);

i3.addActionListener(handler);

i5.addActionListener(handler);

i6.addActionListener(handler);

i7.addActionListener(handler);

i8.addActionListener(handler);

i10.addActionListener(handler);

i11.addActionListener(handler);

workoff.addItemListener(handler);

}

public void paint(Graphics g)

{

g.drawString(msg,10,200);

if(workoff.getState())

  g.drawString("Checked",10,200);

 else

g.drawString("Unchecked",10,200);

}}

class Mymenuhandler implements ActionListener,ItemListener {

   TestMenu tm;

  Mymenuhandler(TestMenu tm) {

 this.tm=tm;

}

public void actionPerformed(ActionEvent ae) {

  String msg=" You selected";

    String s=ae.getActionCommand();

if(s.equals("New...."))

    msg="New";

  else if(s.equals("Quit....")) {

      //activate a dialog box

        TestDialog d=new TestDialog(tm,"Confirm Exit Dialog");

     d.setVisible(true);

 } }

public void itemStateChanged(ItemEvent ie) {

tm.repaint();

}}

class TestDialog extends Dialog implements ActionListener {

Frame f;

String s;

Button b,b1;

TestDialog(Frame f,String title){

   super(f,title,false);

   this.f=f;

    this.s=title;

  setLayout(new FlowLayout());

  setSize(300,200);

 add(new Label("Are you sure you want to exit"));

     add(b=new Button("Yes"));

  add(b1=new Button("No"));

b.addActionListener(this);

b1.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

  if(e.getSource() == b){

dispose();

f.setVisible(false);

}

else {

dispose();

}}}

public class DemoMenu extends Applet {

Frame f;

public void init() {

  f=new TestMenu("My Menu Frame");

  f.setSize(300,500);

  f.setVisible(true);

}

public void start() {

  f.setVisible(true);

}

public void stop() {

  f.setVisible(false);

}}

90  Program to Demonstrate Text Area

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class DemoTextArea extends Applet implements ActionListener {

  TextArea remark;

   Button b1;

  String msg="";

public void init() {

remark=new TextArea("Enter your remarks",5,50);

b1=new Button("Show");

add(remark);

add(b1);

b1.addActionListener(this);}

public void actionPerformed(ActionEvent e) {

   String s=e.getActionCommand();

if(s.equals("Show")) {

msg=remark.getText();

repaint(); }}

public void paint(Graphics g){

g.drawString(msg,130,160); }}