Runnable run2 = () -> System.out.println("run。。。。。。");
        run2.run();

        Comparator<Integer> myCom = new Comparator<Integer>() {
            @Override
            public int compare(Integer o1, Integer o2) {
                return Integer.compare(o1, o2);
            }
        };

        int compare = myCom.compare(12, 20);
        int compare1 = myCom.compare(20, 12);
        int compare2 = myCom.compare(20, 20);
        System.out.println(compare);
        System.out.println(compare1);
        System.out.println(compare2);
    }

        Comparator<Integer> myCom = (o1, o2) -> Integer.compare(o1, o2);

        int compare = myCom.compare(12, 20);
        int compare1 = myCom.compare(20, 12);
        int compare2 = myCom.compare(20, 20);
        System.out.println(compare);
        System.out.println(compare1);
        System.out.println(compare2);

 Comparator<Integer> myCom = Integer::compare;

        int compare = myCom.compare(12, 20);
        int compare1 = myCom.compare(20, 12);
        int compare2 = myCom.compare(20, 20);
        System.out.println(compare);
        System.out.println(compare1);
        System.out.println(compare2);

(x)-> System.out.println(x);

 x-> System.out.println(x);

 Consumer<String> consumer = new Consumer<String>() {
            @Override
            public void accept(String s) {
                System.out.println("输出的值:"+s);
            }
        };
        
        consumer.accept("今天不想emo了");

 Consumer<String> consumer = s -> System.out.println("输出的值:"+s);

        consumer.accept("今天不想emo了");

   Comparator<Integer> myCom = (o1, o2) -> {
            System.out.println("其他语句");
            return Integer.compare(o1, o2);
        };

Comparator<Integer> com  =(x,y)-> Integer.compare(x,y);

/*
 * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved.
 *  ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms
 /

package java.lang;
/**
 * The <code>Runnable</code> interface should be implemented by any
 * class whose instances are intended to be executed by a thread. The
 * class must define a method of no arguments called <code>run</code>.
 * <p>
 * This interface is designed to provide a common protocol for objects that
 * wish to execute code while they are active. For example,
 * <code>Runnable</code> is implemented by class <code>Thread</code>.
 * Being active simply means that a thread has been started and has not
 * yet been stopped.
 * <p>
 * In addition, <code>Runnable</code> provides the means for a class to be
 * active while not subclassing <code>Thread</code>. A class that implements
 * <code>Runnable</code> can run without subclassing <code>Thread</code>
 * by instantiating a <code>Thread</code> instance and passing itself in
 * as the target.  In most cases, the <code>Runnable</code> interface should
 * be used if you are only planning to override the <code>run()</code>
 * method and no other <code>Thread</code> methods.
 * This is important because classes should not be subclassed
 * unless the programmer intends on modifying or enhancing the fundamental
 * behavior of the class.
 *
 * @author  Arthur van Hoff
 * @see     java.lang.Thread
 * @see     java.util.concurrent.Callable
 * @since   JDK1.0
 */
@FunctionalInterface
public interface Runnable {
    /**
     * When an object implementing interface <code>Runnable</code> is used
     * to create a thread, starting the thread causes the object's
     * <code>run</code> method to be called in that separately executing
     * thread.
     * <p>
     * The general contract of the method <code>run</code> is that it may
     * take any action whatsoever.
     *
     * @see     java.lang.Thread#run()
     */
    public abstract void run();
}

package com.test1.demo;


@FunctionalInterface
public interface MyFunc {

    void  method();
    
}

 //Consumer  消费型接口
    @Test
    public void testConsumer() {
        cosumer(1000, (m) -> System.out.println("星期一" + m)); 
        // 星期一1000.0
    }

    public void cosumer(double m, Consumer<Double> con) {
        con.accept(m);
    }

@Test
    public void testSupplier() {
        List<Integer> numList = getNumList(10, () -> (int) (Math.random() * 100));
        for (Integer integer : numList) {
            System.out.println(integer); //100 以内10位随机整数
        }
    }

    // 需求:产生指定个数的整数放入集合中
    public List<Integer> getNumList(int num, Supplier<Integer> su) {
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < num; i++) {
            Integer integer = su.get();
            list.add(integer);
        }
        return list;
    }

 @Test
    public void  FunctioStr(){
        String c = getFunction("sbjikss", str -> str.toUpperCase());
        System.out.println(c); //SBJIKSS
        String sub = getFunction("sbjikss", str -> str.substring(2, 3));
        System.out.println(sub);//j
    }

    public  String  getFunction( String str, Function<String,String> f) {
        return f.apply(str);
    }

 public  void  tetPre(){
         List<String> list = Arrays.asList("Hello","sss","xxxx","sjjss");
        List<String> list1 = filterStr(list, (pre) -> pre.length() > 3);
        for (String s : list1) {
            System.out.println(s);  // Hello xxxx  sjjss
        }
    }
   //需求：将满足条件字符串放入集合中
    public  List<String>  filterStr(List<String> old , Predicate<String> pre ){
        List<String> newList  = new  ArrayList<>();
        for (String str : old) {
            if (pre.test(str)){
               newList.add(str);
            }
        }
        return newList;
    }