OOP继承扩展

Question

只有运行在 Get Phase 中有一篇摘要。我真的不知道为什么，天哪？

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);
    }
}

不是运行宁它说：

Bus is not abstract and does not override abstract method VCapacity() in Vehicle
public class Bus extends Vehicle

Answer 1

当您扩展 abstract class 时，您需要覆盖父 class 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中不接收参数。

OOP继承扩展

OOP Inheritance Extends

java

inheritance

overriding

abstract