Java子类方法返回零值

Question

我试图得到一个子类方法来从超类返回变量，但是返回值总是给我空的返回。我的猜测是，我遗漏了一些关于超级阶级的东西。它是从子类方法returnweight（）返回值0（零）的值weight

 abstract class Vehicle{
    protected float weight;
    public Vehicle(float weight){
    }
    public abstract float returnweight();
}

class Bike extends Vehicle{

    public Bike(float weight){
        super(weight);
    }
    public float returnweight(){
        return weight;//This returns as zero no matter what
    }
}

代码经过压缩和翻译（本文中没有编译器检查的语法） 提前谢谢

Answer 1

你有：

public Fordon(float weight) {  // What is Fordon? May be Vehicle is needed?
    // No code here?
    this.weight = weight; // Forgot this?
}

编辑：

public Vehicle(float weight) {
    // No code here?
    this.weight = weight; // Forgot this?
}

Answer 2

提示：您确实返回了唯一一个赋值给weight的值，尽管这个赋值是隐式的。也许你的意思是在某个时刻显式地给它赋值？也许在施工期间