rab.java~12~

很好得jbuilder100例源代码

package checkbox;

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

public class rab extends Applet {
  int nd;
  boolean flag1=false;
  boolean flag2=false;
  boolean flag3=false;
  int md=0;
  boolean isStandalone = false;
  ButtonGroup buttonGroup1 = new ButtonGroup();
  JCheckBox c1 = new JCheckBox();
  JCheckBox c2 = new JCheckBox();
  JCheckBox c3 = new JCheckBox();
  /**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 rab() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    c1.setText("圆形");
    c1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        c1_actionPerformed(e);
      }
    });
    c2.setText("正方形");
    c2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        c2_actionPerformed(e);
      }
    });
    c3.setText("扇形");
    c3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        c3_actionPerformed(e);
      }
    });
    this.add(c1, null);
    this.add(c2, null);
    this.add(c3, null);
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void c1_actionPerformed(ActionEvent e) {
      flag1=!flag1;
      if(flag1==true)
        draw(1);
      else
        clear(1);
  }

  void c2_actionPerformed(ActionEvent e) {
      flag2=!flag2;
      if(flag2==true)
        draw(2);
      else
        clear(2);
  }

  void c3_actionPerformed(ActionEvent e) {
      flag3=!flag3;
      if(flag3==true)
         draw(3);
      else
         clear(3);
  }
  public void paint(Graphics g){
     switch(nd){
        case 1:
          g.drawOval(60,60,30,30);
          break;
        case 2:
          g.drawRect(120,60,30,30);
          break;
        case 3:
          g.drawArc(180,60,30,30,0,130);
          break;
     }
     switch(md){
        case 1:
           g.clearRect(20,20,80,80);
           md=0;
           break;
        case 2:
           g.clearRect(110,40,70,70);
           md=0;
           break;
        case 3:
           g.clearRect(180,50,70,70);
           md=0;
           break;
      }
  }
  public void clear(int m){
     md=m;
     repaint();
  }
  public void draw(int n){
     nd=n;
     repaint();
  }
  public void update(Graphics g){
     paint(g);
  }
}