ADVANCE JAVA

Java’s Applet programming :This program creates a simple moving banner using applet and concept of thread. This applet scrolls a message , from left to right ,across applet’s window. This scrolling is done by a separate thread. You can set background color and message according to your choice. Every time inside loop, we call applets repaint method to paint message to output.

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Java’s Applet programming :This java program describes how to create menus and how we can assign events to them (i.e. java’s event source programming). To create a menu bar ,we need to create instance of MenuBar(). Next create instance of Menu() then finally add menu items of type Menuitem(). To listen the events ,we have to implement ActionListener and ItemListener interface.

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Java’s Applet programming :Often you want to use a “dialog box” to hold a set of related controls. Dialog box are primarily used for user input. This java program demonstrate how we can add dialog box to our program. In this program, when user clicks the “new” menu, a dialog box appears before user. This uses the concept of last program to create menu. You can add any functionality you need to present to user.

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import java.awt.*;
import java.applet.*;
import java.io;
/*<applet code = "movingbanner" width =300 height=70>
</applet>*/
public class movingbanner extends Applet implements Runnable{
String msg = "";
BufferdReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the String You Want to scroll");
msg = br.readLine();
System.out.println("Enter the Speed of scrolling");
int p = (int)br.read();
Thread t;
int state=12;
boolean flag;
public void init(){

}
public void start(){
t = new Thread(this);
flag = false;
t.start();
}
public void run(){
char ch;
for( ; ; ){
try{
repaint();
Thread.sleep(p);
setBackground(Color.blue);
setForeground(Color.red);
ch = msg.charAt(0);
msg= msg.substring(1,msg.length());
msg+=ch;
if(flag)
break;
}catch(InterruptedException e){}
}
}
public void stop(){
setBackground(Color.green);
setForeground(Color.red);
flag=true;
t=null;
}
public void paint(Graphics g){
setBackground(Color.orange);
setForeground(Color.red);
g.drawString(msg,10,30);
}
}

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
/*
<applet code ="menudemo"  width =399 height =434>
</applet >
*/
//class sampledialog extends Dialog implements //ActionPerformed{

class mymenu extends Frame {
 String msg = "HEllO ";
 mymenu(String title){
       super(title);
   MenuBar mbar  = new MenuBar();
 setMenuBar(mbar);
 Menu file = new Menu("File");
MenuItem item1,item2,item3,item4;
file.add(item1 = new MenuItem("New"));
file.add(item2 = new MenuItem("Open"));
file.add(item3 = new MenuItem("Save"));
file.add(item4 = new MenuItem("close"));
mbar.add(file);
Menu edit = new Menu("Edit");
MenuItem item5,item6,item7,item8;
edit.add(item5 = new MenuItem("Cut"));
edit.add(item6 = new MenuItem("Copy"));
edit.add(item7 = new MenuItem("Paste"));
edit.add(item8 = new MenuItem("Undo"));
mbar.add(file);
mbar.add(edit);
mymenuhandler handler = new mymenuhandler(this);
item1.addActionListener(handler);
item2.addActionListener(handler);
item3.addActionListener(handler);
item4.addActionListener(handler);
item5.addActionListener(handler);
item6.addActionListener(handler);
item7.addActionListener(handler);
item8.addActionListener(handler);

MyWindowAdapter adapter = new MyWindowAdapter(this);
addWindowListener(adapter);
}
public void paint(Graphics g){
g.drawString(msg,10,200);
}
}
class MyWindowAdapter extends WindowAdapter{
mymenu mmenu;
public MyWindowAdapter(mymenu mmenu){
this.mmenu = mmenu;
}
public void windowClosing(WindowEvent we){
mmenu.setVisible(false);
}
}
class mymenuhandler implements ActionListener,ItemListener{
mymenu mmenu;
public mymenuhandler(mymenu mmenu){
this.mmenu  = mmenu;
}
public void actionPerformed(ActionEvent ae){
String msg1 = "Selected";
String arg =(String)ae.getActionCommand();
if(arg.equals("New"))
msg1="new";
mmenu.msg= msg1;
mmenu.repaint();
}
public void itemStateChanged(ItemEvent ie){
mmenu.repaint();
}
}
public class menudemo extends Applet{
Frame f;
public void init(){
 f= new mymenu("MENU DEMO");
f.setSize(399 , 400);
f.setVisible(true);
}
public void start(){
f.setVisible(true);
}
public void stop(){
f.setVisible(false);
}
}

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
/*
<applet code ="dialogdemo"  width =399 height =434>
</applet >
*/
class sampledialog extends Dialog implements ActionListener{
sampledialog(Frame parent , String title){
super(parent,title,false);
setSize(200,200);

add(new Label("hi"));
Button b = new Button("Cancel");
add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent ae){
dispose();
}
}
 class mymenu extends Frame {
 String msg = "HEllO ";
 mymenu(String title){
       super(title);
   MenuBar mbar  = new MenuBar();
 setMenuBar(mbar);
 Menu file = new Menu("File");
MenuItem item1,item2,item3,item4;
file.add(item1 = new MenuItem("New"));
file.add(item2 = new MenuItem("Open"));
file.add(item3 = new MenuItem("Save"));
file.add(item4 = new MenuItem("close"));
mbar.add(file);
Menu edit = new Menu("Edit");
MenuItem item5,item6,item7,item8;
edit.add(item5 = new MenuItem("Cut"));
edit.add(item6 = new MenuItem("Copy"));
edit.add(item7 = new MenuItem("Paste"));
edit.add(item8 = new MenuItem("Undo"));
mbar.add(file);
mbar.add(edit);
mymenuhandler handler = new mymenuhandler(this);
item1.addActionListener(handler);
item2.addActionListener(handler);
item3.addActionListener(handler);
item4.addActionListener(handler);
item5.addActionListener(handler);
item6.addActionListener(handler);
item7.addActionListener(handler);
item8.addActionListener(handler);

MyWindowAdapter adapter = new MyWindowAdapter(this);
addWindowListener(adapter);
}
public void paint(Graphics g){
g.drawString(msg,10,200);
}
}
class MyWindowAdapter extends WindowAdapter{
mymenu mmenu;
public MyWindowAdapter(mymenu mmenu){
this.mmenu = mmenu;
}
public void windowClosing(WindowEvent we){
mmenu.setVisible(false);
}
}
class mymenuhandler implements ActionListener,ItemListener{
mymenu mmenu;
public mymenuhandler(mymenu mmenu){
this.mmenu  = mmenu;
}
public void actionPerformed(ActionEvent ae){
String msg1 = "Selected";
String arg =(String)ae.getActionCommand();
if(arg.equals("New"))
{
msg1="new";
sampledialog d = new sampledialog(mmenu,"HELLO");
d.setVisible (true);
}
mmenu.msg= msg1;
mmenu.repaint();
}
public void itemStateChanged(ItemEvent ie){
mmenu.repaint();
}
}
public class dialogdemo extends Applet{
Frame f;
public void init(){
 f= new mymenu("MENU DEMO");
f.setSize(399 , 400);
f.setVisible(true);
}
public void start(){
f.setVisible(true);
}
public void stop(){
f.setVisible(false);
}
}

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