接口作为成员变量类型 和 接口作为方法的参数和或返回值

接口作为成员变量类型

public class Hero {
    private String name;
    private SKill sKill;

    public Hero() {
    }

    public Hero(String name, SKill sKill) {
        this.name = name;
        this.sKill = sKill;
    }

    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;
    }
    
    public void attack(){
        System.out.println("我叫='" + name +",开始释放技能：");
        sKill.use();//调用接口中的方法
        System.out.println("释放技能完成");
    }
}

public class Tests {
    public static void main(String[] args) {
        Hero hero = new Hero();
        hero.setName("赵云");
        hero.setsKill(new SKill() {
            @Override
            public void use() {
                System.out.println("chua");
            }
        });
        hero.attack();
    }
}

public interface SKill {
    //释放技能的抽象方法
    void use();
}

 

接口作为方法的参数和或返回值

 

public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        List<String> result = addName(list);
        for (int i = 0; i < result.size(); i++) {
            System.out.println(list.get(i));
        }
    }
    public static List<String> addName(List<String> list){
        list.add("张三");
        list.add("李四");
        list.add("王五");
        list.add("赵六");
        return list;
    }

 

 

 

 

 

 

 

 

 

 

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