91-100 PROGRAMS

91  Program to Make a Login Window

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class login extends Applet implements ActionListener{

  TextField un,pass;

   Button b1,b2;

  String msg="";

public void init(){

un=new TextField(12);

pass=new TextField(8);

pass.setEchoChar('*');

b1=new Button("Verify");

b2=new Button("Cancel");

add(un);

add(pass);

add(b1);

add(b2);

b1.addActionListener(this);

b2.addActionListener(this);

}

public void actionPerformed(ActionEvent e){

   String s=e.getActionCommand();

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

String user=un.getText();

String pwd=pass.getText();

if(user.equals("student") && pwd.equals("loyola")){

   msg="Login Successful";

}

else

  msg="You cannot login.Check your username and password";

}

else{

   un.setText("");

   pass.setText("");

msg="";

}

repaint();

}

public void paint(Graphics g){

g.drawString(msg,40,40);

}}//end of class

92  Program to Make a Login Focus

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class loginFocus extends Applet implements ActionListener,FocusListener {

 TextField un,pass;

 Button b1,b2;

 String msg="";

public void init() {

un=new TextField(12);

pass=new TextField(8);

pass.setEchoChar('*');

b1=new Button("Verify");

b2=new Button("Cancel");

add(un);

add(pass);

add(b1);

add(b2);

un.addFocusListener(this);

pass.addFocusListener(this);

b1.addActionListener(this);

b2.addActionListener(this);

}

public void focusGained(FocusEvent fe) {

if(fe.getSource()==un) {

un.setText("Enter UserName");

}}

public void focusLost(FocusEvent fe) {

if(fe.getSource()==pass) {

   if(pass.getText().equals(""))  {

      msg="Enter the password to login";

repaint();

    }}}

public void actionPerformed(ActionEvent e) {

   String s=e.getActionCommand();

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

String user=un.getText();

String pwd=pass.getText();

if(user.equals("student") && pwd.equals("loyala")) {

   msg="Login Successful";

}

else

  msg="You cannot login.Check your username and password";

}

else {

   un.setText("");

   pass.setText("");

msg="";

}

repaint();

}

public void paint(Graphics g){

g.drawString(msg,40,40);

}}//end of class

93  Program to Demonstrate Mouse Adapter

import java.awt.event.*;

import java.applet.*;

public class MouseAdapterApplet extends Applet {

public void init() {

 addMouseListener(new MouseAdapter(){

  public void mousePressed(MouseEvent e){

          showStatus("Mouse Pressed");}});}}

94  Program to Demonstrate Mouse Events

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class MouseEventsApplet extends Applet implements MouseListener,MouseMotionListener {

 String msg;

public void init() {

msg="";

 addMouseListener(this);

  addMouseMotionListener(this);

}

public void mouseClicked(MouseEvent e){

    msg="mouseClicked";

repaint();

}

public void mouseEntered(MouseEvent e){

    msg="mouseentered";

repaint();

}

public void mouseExited(MouseEvent e){

msg="mouseexit";

repaint();}

public void mousePressed(MouseEvent e){

    msg="mousepressed";

repaint();}

public void mouseReleased(MouseEvent e){

    msg="mousereleased";

repaint();}

public void mouseDragged(MouseEvent e){

    msg="*";

repaint();

}

public void mouseMoved(MouseEvent e){

    msg="mousemoved";

repaint();

}

public void paint(Graphics g){

g.drawString(msg,10,20);

}}

95  Program to Demonstrate the key event handlers

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class SimpleKey extends Applet

implements KeyListener {

String msg = "";

int X = 10, Y = 20; // output coordinates

public void init() {

addKeyListener(this);

requestFocus(); // request input focus

}

public void keyPressed(KeyEvent ke) {

showStatus("Key Down");

}

public void keyReleased(KeyEvent ke) {

showStatus("Key Up");

}

public void keyTyped(KeyEvent ke) {

msg += ke.getKeyChar();

repaint();

}

// Display keystrokes.

public void paint(Graphics g) {

g.drawString(msg, X, Y);

}

}

96  Program to Demonstrate Border Layout

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class TestBL extends Applet {

public void init() {

  setLayout(new BorderLayout());

add(new Scrollbar(Scrollbar.HORIZONTAL),BorderLayout.NORTH);

add(new Scrollbar(Scrollbar.HORIZONTAL),BorderLayout.SOUTH);

add(new Scrollbar(Scrollbar.VERTICAL),BorderLayout.EAST);

add(new Scrollbar(Scrollbar.VERTICAL),BorderLayout.WEST);

add (new TextArea("I am in the center"),BorderLayout.CENTER);

}}

97  Program to Demonstrate Card Layout

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class TestCL extends Applet implements ActionListener {

Panel p,p1,p2;

CardLayout cl1;

Label l1;

Button b1,b2;

CheckboxGroup cbg;

Checkbox c1,c2;

public void init()  {

  l1=new Label("Licesence Agreement");

  b1=new Button("Accept");

  b2=new Button("Exit");

  cl1=new CardLayout();

  p=new Panel();

   p.setLayout(cl1);

p1=new Panel();

p1.add(l1);

   p1. add(b1);

p1.add(b2);   

  p2=new Panel();

  cbg=new CheckboxGroup();

c1=new Checkbox("Typical",cbg,true);

  c2=new Checkbox("Custom",cbg,false);

p2.add(c1);

  p2.add(c2);

p.add(p1,"panel1");

p.add(p2,"panel2");

  add(p);

b1.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

if(e.getSource() == b1) {

  cl1.show(p,"panel2");

}}

98  Program to Test Fonts Using Mouse Events

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class TestFonts extends Applet{

  int n=0;

  Font f;

String msg;

public void init(){

f=new Font("Dialog",Font.PLAIN,12);

msg="Hello World";

setFont(f);

addMouseListener(new MyMouseAdapter(this));

}

public void paint(Graphics g){

g.drawString(msg,10,40);

}}

class MyMouseAdapter extends MouseAdapter{

TestFonts tfonts;

public MyMouseAdapter(TestFonts f){

tfonts=f;

}

public void mousePressed(MouseEvent e){

tfonts.n++;

switch(tfonts.n){

case 1:

tfonts.f=new Font("DialogInput",Font.BOLD,20);

break;

case 2:

tfonts.f=new Font("SansSerif",Font.BOLD,22);

break;

case 3:

tfonts.f=new Font("Serif",Font.BOLD,24);

break;

case 4:

tfonts.f=new Font("Monospaced",Font.BOLD,26);

break;

}

if(tfonts.n==4){

tfonts.n=-1;

tfonts.setFont(tfonts.f);

tfonts.repaint();

}} }

99  Program to Demonstrate Grid Layouts


import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class TestGL extends Applet{

public void init(){

  setLayout(new FlowLayout(FlowLayout.CENTER));

add(new TextField("0"));

setLayout(new GridLayout(3,3));

setFont(new Font("SansSerif",Font.BOLD,16));

for(int i=0;i<3;i++){

for(int j=0;j<3;j++){

int k=i*3+j;

if(k>0)

  add(new Button(""+k));

}}}}

100  Program to Demonstrate Scrollbar

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class TestScrollBar extends Applet implements AdjustmentListener

{

  Scrollbar s1,s2,s3;

  public void init()

  {

     s1=new Scrollbar(Scrollbar.HORIZONTAL,100,10,0,255);

     s2=new Scrollbar(Scrollbar.VERTICAL,50,10,0,255);

  s3=new Scrollbar(Scrollbar.VERTICAL,150,10,0,255);

    setLayout(new BorderLayout());

add(s1,BorderLayout.SOUTH);

 add(s2,BorderLayout.EAST);

 add(s3,BorderLayout.WEST);

    //register to recieve adjustment events

 s1.addAdjustmentListener(this);

  s2.addAdjustmentListener(this); 

 s3.addAdjustmentListener(this);

}

public void adjustmentValueChanged(AdjustmentEvent e)

{

  repaint();

}

public void paint(Graphics g)

{

   int r=s1.getValue();

   int g1=s2.getValue();

   int b=s3.getValue();

  Color c=new Color(r,g1,b);

 setBackground(c);

    }

}