ativebutton.java

这是一个在applet中“改背景颜色的按钮”的程序。当鼠标放在按钮上

import java.awt.*;
import java.applet.*;
import javax.swing.*;
import java.net.*;

public class AtiveButton extends Applet {
  //创建改变背景与前景颜色的按钮
  ChangeBgButton changeBgButton = new ChangeBgButton("改背景颜色的按钮");
  ChangeIconButton changeIconButton;
  String[] iconFileNames = {"1.gif", "2.gif"};
  ImageIcon[] icons = new ImageIcon[2];

  //Applet的初始化方法
  public void init() {
    try {jbInit();} catch(Exception e) {}
  }
  //被初始化方法引用的方法
  private void jbInit() throws Exception {
    this.setLayout(null);
    //建立动态按钮的图标
    for(int i = 0; i  < 2; ++i){
      icons[i] = new ImageIcon(new URL(this.getCodeBase() + iconFileNames[i]));
    }
    //创建改变按钮图标的按钮
    changeIconButton = new ChangeIconButton("",icons);
    //设置按钮的位置与大小
    changeBgButton.setBounds(new Rectangle(30, 35, 138, 29));
    changeIconButton.setBounds(new Rectangle(200, 25, 50, 50));
    //向Applet加入按钮
    this.add(changeBgButton);
    this.add(changeIconButton);
  }
}