Wednesday, 26 February 2014

CREATING A WINDOWED PROGRAM

How to  Create an AWT-based application.

Creating applets is the most commom use for java's AWT
But,it is possible to create stand-alone AWT based applications to do this

  • simply create an instance of the window or windows you need inside main()
  • e.g. create frame window with in main()

The example program is  shown below:

// Create an AWT-based application.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
// Create a frame window.
public class AppWindow extends Frame 
{
String keymsg = "This is a test.";
String mousemsg = "";
int mouseX=30, mouseY=30;
public AppWindow() 
{
addKeyListener(new MyKeyAdapter(this));
addMouseListener(new MyMouseAdapter(this));
addWindowListener(new MyWindowAdapter());
}
public void paint(Graphics g) {
g.drawString(keymsg, 10, 40);
g.drawString(mousemsg, mouseX, mouseY);
}

// Create the window.
public static void main(String args[]) 
{
AppWindow appwin = new AppWindow();
appwin.setSize(new Dimension(300, 200));
appwin.setTitle("An AWT-Based Application");
appwin.setVisible(true);
}
}
class MyKeyAdapter extends KeyAdapter 
{
AppWindow appWindow;
public MyKeyAdapter(AppWindow appWindow) 
{
this.appWindow = appWindow;
}
public void keyTyped(KeyEvent ke) 
{
appWindow.keymsg += ke.getKeyChar();
appWindow.repaint();
};
}
class MyMouseAdapter extends MouseAdapter 
{

AppWindow appWindow;
public MyMouseAdapter(AppWindow appWindow) 
{
this.appWindow = appWindow;
}
public void mousePressed(MouseEvent me) 
{
appWindow.mouseX = me.getX();
appWindow.mouseY = me.getY();
appWindow.mousemsg = "Mouse Down at " + appWindow.mouseX +
", " + appWindow.mouseY;
appWindow.repaint();
}
}
class MyWindowAdapter extends WindowAdapter 
{
public void windowClosing(WindowEvent we) 
{
System.exit(0);
}
}

OUTPUT

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