package df;

public class Fu {
    public void show() {
        System.out.println("show方法被调用");
    }
}

package df;

public class Zi extends Fu {
    public void method(){
        System.out.println("method方法被调用");
    }
}

package df;

public class Demo {
    public static void main(String[] args) {
        Fu f=new Fu();
        f.show();

        Zi z=new Zi();
        z.method() ;
        z.show();

    }
}