?? light.java
字號:
package myoven.light;
public class Light {
private static Light instance;
private boolean isOn;
public static Light getInstance(){
if(instance==null){
System.out.println("new a light");
instance = new Light();
}
return instance;//返回唯一實例
}
public boolean getIsOn(){//返回燈狀態
return isOn;
}
public Light() {
isOn=false;//初始等為關閉狀態
}
public void turnOn(){
isOn=true;
}
public void turnOff(){
isOn=false;
}
}
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