Java中Lambda表达式基础及使用

public interface Eatable {
    void eat();
}

public class EatableImpl implements Eatable{
    @Override
    public void eat() {
        System.out.println("一天一苹果");
    }
}

public class EatableDemo {
    public static void main(String[] args) {
        //主方法调用useEatable
        Eatable e = new EatableImpl();
        useEatable(e);
        //匿名内部类
        useEatable(new Eatable() {
            @Override
            public void eat() {
                System.out.println("一天一苹果");
            }
        });

        //lambda表达式
        useEatable(() -> {
            System.out.println("一天一苹果");
        });

 

    }

    private static void useEatable(Eatable e){
        e.eat();
    }
}

public interface Eatable {
    void eat(String name);
}

public class EatDemo {
    public static void main(String[] args) {
        useEat((String name) -> {
            System.out.println(name);
            System.out.println("输出的啥");
        });
    }

    private static void useEat(Eatable e){
        e.eat("苹果");
    }

}

public interface Addable {
    int add(int x,int y);
}
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public class AddableDemo {
    public static void main(String[] args) {
        useAddable( (int x,int y ) -> {
            return x+y;
        });
    }

    private static void useAddable(Addable a){
        int sum = a.add(5, 7);
        System.out.println(sum);
    }

}