java - 我对子类有一些问题，如何使用 super.method()

Question

我的 child 类(class)是

public class User extends Alien
{

public User(XYCoordination currentLocation, int energyCanister, int lifePoints, String name)

{

super(currentLocation, energyCanister,lifePoints, name);

}

    public int collectCanister(NormalPlanet canister)
    {
        super.collectCanister();
        return energyCanister;
    }

}

我的父类是:

public class Alien
{

protected XYCoordination currentLocation;

protected Planet currentPlanet;

 protected int energyCanister;

 protected int lifePoints;

protected int n;

 private String name;

    public Alien(XYCoordination currentLocation, int energyCanister)
    {
        this.currentLocation = currentLocation;
        this.energyCanister = energyCanister;
        this.lifePoints = lifePoints;
        this.name = name;
    }

...

    public int collectCanister(NormalPlanet canister)
    {
        energyCanister = energyCanister + (int)(n*canister.getRemainingCanister());
        return energyCanister;
    }
...

}

当我编译它时，子类带有

public int collectCanister(NormalPlanet canister)
{
    super.collectCanister();
    return energyCanister;
}

不工作？我能做什么？

Answer 1

首先，您的 super.collectCanister(...) 需要一个参数，其次 Alien 的构造函数应该再接受两个参数 - 否则两个 lifePoints 和 name 不会被设置!

这是对 super.collectCanister 方法的"new"调用:

public int collectCanister(NormalPlanet canister)
{
    super.collectCanister(canister);
    return energyCanister;
}

这就是外星人的构造函数应该是这样的:

public Alien(XYCoordination currentLocation, 
             int energyCanister, 
             int lifePoints, 
             String name) {
    ....
}