java - 如何在 Java 类之间共享公共(public)代码

Question

我有那些 Java 类:

public class Item {
    String name;
    int price;
    int weight;

    public Item(String name, int price, int weight) {
        this.name = name;
        this.price = price;
        this.weight = weight;
    }
}

public class Sword extends Item {
    int damage;
    int speed;

    public Sword(String name, int price, int weight, int damage, int speed) {
        super(name, price, weight);
        this.damage = damage;
        this.speed = speed;
    }
}

public class HasDurability {
    int current_durability;
    int max_durability;

    public HasDurability(int durability) {
        this.max_durability = durability;
        this.current_durability = durability;
    }

    public void damage(int damage) {
        current_durability -= damage;
    }
}

我想与 Sword 共享 HasDurability 类的代码，但不与 Item 共享。

编辑:我还想与 Armor 等其他类共享 HasDurability。

我只能延长一个类。如何将 Item 和 HasDurability 的代码共享到 Sword 类？

Answer 1

看起来更像你应该有这样的层次结构

public class Item

public class DurableItem extends Item

public class Sword extends DurableItem

除非有某种东西可以具有耐用性，但它不是元素，这听起来不太可能。