Question

仅在获取阶段中使用一个摘要运行。我真的不知道为什么，OMG？

abstract public class Vehicle {
    public int nWheels = 0;
    public int VCapacity;

    // Set
    public void numWheels(int nWheels) {
        this.nWheels = nWheels;
    }
    public void VCapacity(int VCapacity) {
        this.VCapacity = VCapacity;
    }

    // Get
    public abstract int getWheels();
    public abstract int VCapacity();

    public Vehicle() { }

    public Vehicle(int nWheels, int VCapacity) {
        numWheels(nWheels);
        VCapacity(VCapacity);
    }
}

没有运行它说：

总线不是抽象的，并且不会覆盖车辆中的抽象方法VCapacity（）公共汽车扩展车辆

Answer 1

扩展abstract类时，需要覆盖父类中定义的方法。

public class Bus extends Vehicle {
    public Bus() {
        super(6, 4); // to set capacity use the Vehicle (int nWheels, int VCapacity) constructor
    }

    @Override
    public int VCapacity() {
    }
}

在Vehicle中，它不接收参数。

OOP继承扩展

1 个答案: