Java常用函数式接口总结

@FunctionalInterface
public interface Runnable {

    public abstract void run();
}
//超级多FunctionalInterface
//简化编程模型，在新版本的框架底层大量应用!
//foreach(消费者类型的函数式接口)

 package com.function;


import java.util.function.Function;


public class Demo01 {


    public static void main(String[] args) {
        //工具类：输出输入的值
//      Function function =  new Function<String,String>() {
//            @Override
//            public String apply(String o) {
//                return o;
//            }
//        };
        //System.out.println(function .apply("asd"));
    Function<String,String> function= (str)->{return str;};
    System.out.println(function.apply("asd"));
    }
}

package com.function;


import java.util.function.Predicate;


public class Demo02 {


    public static void main(String[] args) {
        //判断字符串是否为空
//        Predicate<String> predicate = new Predicate<String>() {
//            @Override
//            public boolean test(String str) {
//                return str.isEmpty();
//            }
//        };
        Predicate<String> predicate =(str)->{
            return str.isEmpty();
        };
        System.out.println(predicate.test("asd"));

    }
}

package com.function;

import java.util.function.Consumer;


public class Demo03 {


    public static void main(String[] args) {
//        Consumer<String> consumer = new Consumer<String>() {
//            @Override
//            public void accept(String str) {
//                System.out.println(str);
//            }
//        };
        //函数式接口
        Consumer<String> consumer = (str)->{
            System.out.println(str);
        };
        consumer.accept("ssssssssssssssss");

    }
}

//有入参没有返回值
        list.forEach(x->{
            System.out.println(x);
        });

package com.function;

import java.util.function.Supplier;


public class Demo04 {


    public static void main(String[] args) {
//        Supplier<String> supplier = new Supplier<String>() {
//            @Override
//            public String get() {
//                System.out.println("Get");
//                return "1024";
//            }
//        };
        Supplier<String> supplier = () ->{
          return "1024";
        };
        System.out.println(supplier.get());
    }
}