Java多线程之ThreadLocal简介说明

ThreadLocal简介

ThreadLocal功能:
  提供线程内的局部变量
  这种变量在线程的生命周期内起作用
      只能同一个线程有效
      是一个线程内的局部变量

ThreadLocal用法示例

package com.java265.a;
 
public class Demo {
    static ThreadLocal<String> threadLocal = new ThreadLocal<>();
 
    static void print(String str){
        System.out.println(str + ":" + threadLocal.get());
    }
 
    public static void main(String[] args) {
        Thread thread1 = new Thread(new Runnable() {
            @Override
            public void run() {
                threadLocal.set("abc");
                print("thread1 variable");
            }
        });
 
        Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                threadLocal.set("def");
                print("thread2 variable");
            }
        });
 
        thread1.start();
        thread2.start();
    }
}

----运行以上代码，将输出以下信息------

thread1 variable:abc
thread2 variable:def