Java--JUC--ReetrantReadLock读写锁

1. 　ReadWriteLock 使用
2. 　　ReadWriteLock readWriteLock =new ReentrantReadWriteLock()
3. 　　

   package com.model.new_concurrent;
   
   import java.util.HashMap;
   import java.util.Map;
   import java.util.concurrent.TimeUnit;
   import java.util.concurrent.locks.Lock;
   import java.util.concurrent.locks.ReadWriteLock;
   import java.util.concurrent.locks.ReentrantReadWriteLock;
   
   /**
    * @Description:测试类
    * @Author: 张紫韩
    * @Crete 2021/6/6 21:27
    */
   public class Test02 {
       public static void main(String[] args) {
           MapTest mapTest=new MapTest()；for (int i = 1; i <=5; i++) {
               int temp= i;
               new Thread(() ->{
                   mapTest.set(temp+"",temp+"");
               },"A").start();
           }
           for (int i = 1; i <=5; i++) {
               int temp= i;
               new Thread(() ->{
                   mapTest.get(temp+"");
               },"A").start();
           }
   
       }
   
   }
   class MapTest{
       private  volatile  Map<String,Object>  map=new HashMap<>();
       private ReadWriteLock readWriteLock= new ReentrantReadWriteLock();
       public void set(String k,String v){
           readWriteLock.writeLock().lock();
           try {
               System.out.println("写入"+k);
               TimeUnit.SECONDS.sleep(2);
               map.put(k,v);
               System.out.println("完成"+k);
           }catch (Exception e){
               e.printStackTrace();
           }finally {
               readWriteLock.writeLock().unlock();
           }
   
       }
   
       public void get(String k){
           readWriteLock.readLock().lock();
           try {
               System.out.println("读取"+k);
               TimeUnit.SECONDS.sleep(2);
               map.get(k);
               System.out.println("完成"+k);
           }catch (Exception e){
               e.printStackTrace();
           }finally {
               readWriteLock.readLock().unlock();
           }
       }
   
   }