flowlayoutdemo.java

java2参考大全上的例子的源码和自己的理解.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class FlowLayoutDemo extends Applet implements ItemListener
{
  String msg="";
  Checkbox Win98, WinNT,Linux, mac;

  public void init()
  {
        setLayout(new FlowLayout(FlowLayout.LEFT));

        Win98= new Checkbox("Win98",null,false);
        WinNT = new Checkbox("Win NT/2000");
        Linux = new Checkbox("Linux / Unix");
        mac = new Checkbox("MacOS");

        add(Win98);
        add(WinNT);
        add(Linux);
        add(mac);

        Win98.addItemListener(this);
        WinNT.addItemListener(this);
        Linux.addItemListener(this);
        mac.addItemListener(this);
  }

public void itemStateChanged(ItemEvent ie)
{
   repaint();
}

public void paint(Graphics g)
{
   msg="current state: ";
   g.drawString(msg, 6, 80);
   msg=" Window 98: "+Win98.getState();
   g.drawString(msg, 6, 100);
   msg=" Window NT / 2000: "+WinNT.getState();
   g.drawString(msg, 6, 120);
   msg=" Linux / Unix: "+Linux.getState();
   g.drawString(msg, 6, 140);
   msg=" MacOs "+mac.getState();
   g.drawString(msg, 6, 160);


}

}