package org.example;

public class TestLambda {
    public static void main(String[] args) {
        Like like=new Like();
        like.lambda();
    }

}

//定义一个函数式接口
interface ILike{
    void lambda();
}

//实现类
class Like implements ILike{

    @Override
    public void lambda() {
        System.out.println("我喜欢学习");
    }
}

 

将实现类放进内部类中

package org.example;

public class TestLambda {

   static class Like2 implements ILike{

        @Override
        public void lambda() {
            System.out.println("我喜欢美食");
        }
    }

    public static void main(String[] args) {
        ILike like=new Like();
        like.lambda();
        like= new Like2();
        like.lambda();
    }

}

//定义一个函数式接口
interface ILike{
    void lambda();
}

//实现类
class Like implements ILike{

    @Override
    public void lambda() {
        System.out.println("我喜欢学习");
    }
}

 局部内部类 

package org.example;

public class TestLambda {

   static class Like2 implements ILike{

        @Override
        public void lambda() {
            System.out.println("我喜欢美食");
        }
    }

    public static void main(String[] args) {
        ILike like=new Like();
        like.lambda();
        like= new Like2();
        like.lambda();



        class Like3 implements ILike{

            @Override
            public void lambda() {
                System.out.println("我喜欢电影");
            }
        }
        like=new Like3();
        like.lambda();
    }

}

//定义一个函数式接口
interface ILike{
    void lambda();
}

//实现类
class Like implements ILike{

    @Override
    public void lambda() {
        System.out.println("我喜欢学习");
    }
}

 匿名内部类

package org.example;

public class TestLambda {

    //静态内部类
   static class Like2 implements ILike{

        @Override
        public void lambda() {
            System.out.println("我喜欢美食");
        }
    }

    public static void main(String[] args) {
        ILike like=new Like();
        like.lambda();
        like= new Like2();
        like.lambda();



        //局部内部类
        class Like3 implements ILike{

            @Override
            public void lambda() {
                System.out.println("我喜欢电影");
            }
        }
        like=new Like3();
        like.lambda();




        //匿名内部类
        like=new ILike() {
            @Override
            public void lambda() {
                System.out.println("我喜欢逛街");
            }
        };
        like.lambda();


    }

}

//定义一个函数式接口
interface ILike{
    void lambda();
}

//实现类
class Like implements ILike{

    @Override
    public void lambda() {
        System.out.println("我喜欢学习");
    }
}

 like=new ILike() {
            @Override
            public void lambda() {
                System.out.println("我喜欢逛街");
            }
        };
        like.lambda();

lambda简化

package org.example;

public class TestLambda {

    //静态内部类
   static class Like2 implements ILike{

        @Override
        public void lambda() {
            System.out.println("我喜欢美食");
        }
    }

    public static void main(String[] args) {
        ILike like=new Like();
        like.lambda();
        like= new Like2();
        like.lambda();



        //局部内部类
        class Like3 implements ILike{

            @Override
            public void lambda() {
                System.out.println("我喜欢电影");
            }
        }
        like=new Like3();
        like.lambda();




        //匿名内部类
        like=new ILike() {
            @Override
            public void lambda() {
                System.out.println("我喜欢逛街");
            }
        };
        like.lambda();


        //用lambda简化
        like=()->{
            System.out.println("我喜欢音乐");
        };
        like.lambda();
    }

}

//定义一个函数式接口
interface ILike{
    void lambda();
}

//实现类
class Like implements ILike{

    @Override
    public void lambda() {
        System.out.println("我喜欢学习");
    }
}

  like=()->{
            System.out.println("我喜欢音乐");
        };
        like.lambda();

 

去掉花括号

 //去掉花括号
        like=() -> System.out.println("我喜欢画画");
        like.lambda();