textfieldkey.java~1~

java2参考大全上的例子的源码和自己的理解.

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;
  }
}