类作为成员变量类型和接口作为成员变量类型

类作为成员变量类型

代码：

武器类

public class Weapon {
    private String code;

    public Weapon() {
    }

    public Weapon(String code) {
        this.code = code;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
}

英雄类

public class Hero {
    private String name;//英雄的姓名
    private int age;//年龄
    private Weapon weapon;//武器

    public Hero(String name, int age, Weapon weapon) {
        this.name = name;
        this.age = age;
        this.weapon = weapon;
    }

    public Hero() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Weapon getWeapon() {
        return weapon;
    }

    public void setWeapon(Weapon weapon) {
        this.weapon = weapon;
    }
    //英雄攻击的方法
    public void method(){
        System.out.println("名字"+name+"年龄"+age+"用"+weapon.getCode()+"攻击敌人");
    }

}

测试类

public class test {
    public static void main(String[] args) {
        Hero hero = new Hero();
        hero.setName("张三");
        hero.setAge(20);
        Weapon d = new Weapon("大宝剑");
        hero.setWeapon(d);

        hero.method();
    }
}

运行结果：

 

接口作为成员变量类型

接口：

public interface Skill {
    public abstract void ability();
}

英雄类

public class Hero {
    private String name;//英雄的姓名
    private Skill skill;

    public Hero(String name, Skill skill) {
        this.name = name;
        this.skill = skill;
    }

    public Hero() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Skill getSkill() {
        return skill;
    }

    public void setSkill(Skill skill) {
        this.skill = skill;
    }

    //英雄攻击的方法
    public void method(){
        System.out.println("英雄的名字"+name+"施法技能");
        skill.ability();
        System.out.println("施法成功");
    }

}

测试

public class test {
    public static void main(String[] args) {
        Hero hero = new Hero();
        hero.setName("张三");
        hero.setSkill(new Skill() {
            @Override
            public void ability() {
                System.out.println("bu bu bu");
            }
        });

        hero.method();
    }
}