ThreadLocal使用

封装类

ThreadLocalClient.java

package com.wzq.demoftl.thread.threadLocal;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class ThreadLocalClient {

    private static ThreadLocal<Map<String,String>> threadLocal = ThreadLocal.withInitial(() -> {
        System.out.println("get 为空 初始化!");
        return new ConcurrentHashMap<>();
    });

    public static void set(String key, String value){
        threadLocal.get().put(key, value);
    }

    public static String get(String key){
        return threadLocal.get().get(key);
    }



}

使用

package com.wzq.demoftl.thread.threadLocal;

import java.util.HashMap;
import java.util.Map;

public class ThreadLocalMain {



    public static void main(String[] args) {
        Thread t1 = new Thread(() -> {
            ThreadLocalClient.set("user","你好!1");
            System.out.println(ThreadLocalClient.get("user"));

        });
        Thread t2 = new Thread(() -> {
            ThreadLocalClient.set("user","你好!2");
            try {
                t1.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(ThreadLocalClient.get("user"));

        });


        t1.start();
        t2.start();
    }

}