1、ArrayList線程不安全；CopyOnWriteArrayList線程安全

package concurrent;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.concurrent.CopyOnWriteArrayList;

/**

* Auth: zhouhongliang

* Date：2019/8/1

* CopyOnWriteArrayList 替代 ArrayList

*/

public class CopyOnWriteArrayListDemo {

public static void main(String[] args) {

List list = new CopyOnWriteArrayList<>();

//List list = new CopyOnWriteArrayList<>();

for (int i=0;i<1000;i++){

list.add(i);

}

Iterator iterator = list.iterator();

while(iterator.hasNext()){

list.remove(iterator.next());

}

System.out.println(list);

}

}

2、HashMap線程不安全；HashTable synchronize線程安全、```

ConcurrentHashMap采用”分段鎖”線程安全；

package concurrent;

import java.util.HashMap;

import java.util.Hashtable;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

/**

Auth: zhouhongliang

Date：2019/8/1*/public class ConcurrentHashMapDemo {public static void main(String[] args) throws InterruptedException {Map map = new HashMap();//線程不安全//Map map = new Hashtable();//線程安全//Map map = new ConcurrentHashMap();//線程安全ExecutorService executorService = Executors.newCachedThreadPool();CountDownLatch countDownLatch = new CountDownLatch(10000);for (int i=0;i<10000;i++){final Integer index = i;executorService.execute(()->{map.put(index,index);countDownLatch.countDown();});}countDownLatch.await();System.out.println(map.size());}}

總結

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