class Fu { //父類
public int num=10;
public Fu(){
System.out.println(“Fu”);
}
}

class Zi extends Fu{ //子類
public int num=20;
public Zi(){
//super();預設呼叫父類,列印“fu”
System.out.println(“zi”);
}
public void show(){ //建立方法
int num=30;
System.out.println(num);
System.out.println(this.num);
System.out.println(super.num);
}
}

class Test1_Extends{ //主函式
public static void main(String[] args){
Zi z=new Zi(); //建立物件
z.show(); //呼叫方法
}
}