Lambda

原始写法

interface User{
    String UserName(String name);
}
class Iuser implements User{

    @Override
    public String UserName(String name) {
        return "我是"+name;
    }
}

public class Lambda01 {

    public static void main(String[] args) {
        User user = new Iuser();
        String userName = user.UserName("阿鑫");
        System.out.println(userName);

    }
}

静态内部类

interface User {
    String UserName(String name);
}

public class Lambda01 {

    static class Iuser implements User {

        @Override
        public String UserName(String name) {
            return "我是" + name;
        }
    }

    public static void main(String[] args) {
        User user = new Iuser();
        String userName = user.UserName("阿鑫");
        System.out.println(userName);

    }
}

局部内部类

interface User {
    String UserName(String name);
}

public class Lambda01 {
    public static void main(String[] args) {
        class Iuser implements User {

            @Override
            public String UserName(String name) {
                return "我是" + name;
            }
        }

        User user = new Iuser();
        String userName = user.UserName("阿鑫");
        System.out.println(userName);

    }
}

匿名内部类

interface User {
    String UserName(String name);
}

public class Lambda01 {
    public static void main(String[] args) {
        User user = new User() {
            @Override
            public String UserName(String name) {
                return "我是"+name;
            }
        };

        String userName = user.UserName("阿鑫");
        System.out.println(userName);

    }
}

Lambda

interface User {
    String UserName(String name);
}

public class Lambda01 {
    public static void main(String[] args) {
        User user = (name) -> {
            return "我是"+name;
        };

        String userName = user.UserName("阿鑫");
        System.out.println(userName);

    }
}