powertube.java

该程序是用jbuilder制作

package myoven.powertube;

public class PowerTube {

  private static PowerTube instance;
  private boolean isOn;//标志其工作状态isOn==true为处于工作加热状态，isOn=false为不工作状态
  public static PowerTube getInstance(){
    if(instance==null)
      instance=new PowerTube();
    return instance;//返回唯一实例
  }

  public boolean getIsOn(){
    return isOn;
  }
  public PowerTube() {
    isOn=false;//初始默认为非工作状态
  }
  public void turnOn(){
    isOn=true;
  }
  public void turnOff(){
    isOn=false;
  }

}