package com.cppdy;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

public class ThreadDemo16 {

    public static void main(String[] args) throws Exception {

        Map<String, String> map=new HashMap<>();

        map.put("name", "吹泡泡的魚");

        //将线程不安全集合变为线程安全集合

        Map<String, String> synchronizedMap = Collections.synchronizedMap(map);

    }

}

package com.cppdy;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.ConcurrentMap;

public class ThreadDemo16 {

    public static void main(String[] args) throws Exception {

        //分段存储，分段锁，只要多个修改操作发生在不同的段上，它们就可以并发进行，最高支持16个线程的并发修改操作

        ConcurrentMap<String, String> concurrentMap=new ConcurrentHashMap<String, String>();

    }

}