checkboxaction.java~1~

java2参考大全上的例子的源码和自己的理解.

package checkboxaction;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

import java.awt.*;
public class CheckBoxAction extends java.applet.Applet
{  	Checkbox b1,b2,b3;
  public void init() {
    b1 = new Checkbox("Label1", null, false);
    b2 = new Checkbox("Label2", null, false);
    b3 = new Checkbox("Label3", null, false);
    add(b1);
    add(b2);
    add(b3);
  }

  public boolean action(Event evt, Object arg) {
    if (evt.target instanceof Checkbox) {
      Checkbox selectedbox = (Checkbox) evt.target;
      String str = selectedbox.getLabel();
      if (str == "Label1")
        selectedbox.setLabel("Chnage1");
      else if (str == "Label2")
        selectedbox.setLabel("Chnage2");
      else if (str == "Label3")
        selectedbox.setLabel("Change3");
    }
    repaint();
    return true;
  }
}