applet1.java

来自「是用java开发的一些程序原代码 是用java开发的一些程序原代码」· Java 代码 · 共 77 行

package ex12_02;

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

public class Applet1 extends Applet {
  boolean isStandalone = false;
  Button button1 = new Button();
  Button button2 = new Button();
  Button button3 = new Button();
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  /**Construct the applet*/
  public Applet1() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    button1.setLabel("红色");
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    button2.setLabel("蓝色");
    button2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button2_actionPerformed(e);
      }
    });
    button3.setLabel("绿色");
    button3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button3_actionPerformed(e);
      }
    });
    this.add(button1, null);
    this.add(button2, null);
    this.add(button3, null);
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void button1_actionPerformed(ActionEvent e) {
  //将Applet显示的区域颜色改变为红色
this.setBackground(Color.red);
  }

  void button2_actionPerformed(ActionEvent e) {
  //将Applet显示的区域颜色改变为蓝色
this.setBackground(Color.blue);
  }

  void button3_actionPerformed(ActionEvent e) {
  //将Applet显示的区域颜色改变为绿色
this.setBackground(Color.green);
  }
}