che.java

很好得jbuilder100例源代码

package radio;

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

public class che extends Applet {
  boolean isStandalone = false;
  ButtonGroup radiobuttongroup1 = new ButtonGroup();
  JRadioButton radiobutton1 = new JRadioButton();
  JRadioButton radiobutton2 = new JRadioButton();
  JRadioButton radiobutton3 = new JRadioButton();
  /**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 che() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    radiobutton1.setText("圆形");
    radiobutton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        radiobutton1_actionPerformed(e);
      }
    });
    radiobutton2.setText("正方形");
    radiobutton2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        radiobutton2_actionPerformed(e);
      }
    });
    radiobutton3.setText("扇形");
    radiobutton3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        radiobutton3_actionPerformed(e);
      }
    });
    this.add(radiobutton1, null);
    this.add(radiobutton2, null);
    this.add(radiobutton3, null);
    radiobuttongroup1.add(radiobutton1);
    radiobuttongroup1.add(radiobutton2);
    radiobuttongroup1.add(radiobutton3);
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void radiobutton1_actionPerformed(ActionEvent e) {
     repaint();
  }

  void radiobutton2_actionPerformed(ActionEvent e) {
     repaint();
  }

  void radiobutton3_actionPerformed(ActionEvent e) {
     repaint();
  }

  public void paint(Graphics g){
    g.clearRect(0,20,300,280);
    if(radiobutton1.isSelected())
          g.drawOval(60,60,30,30);
    if(radiobutton2.isSelected())
          g.drawRect(120,60,30,30);
    if(radiobutton3.isSelected())
          g.drawArc(180,60,30,30,0,130);
  }
  public void update(Graphics g){
     paint(g);
  }
}