Java 在子类中定义和父类同名类，导致子类不可修改

//修改

public void hitTank(Shot s,tank tank){
        tank.islive = false;
}

//父类

public class tank {
    private int x;
    private int y;
    private int direct;
    private int speed =10;
    boolean islive = true;
}

//子类

public class Hero extends tank {

   // Shot shot =null;
    Vector shots = new Vector<>();
    boolean islive =true;
}

方法hitTank(Shot s,tank tank) 传入子类 Hero 此处仅修父类的参数