ThreadLocal简介说明

ThreadLocal简介说明

ThreadLocal用于线程间数据隔离
ThreadLocal用于定义线程内部的变量，此变量只适用于线程本身
不在多线程之间共享
使用ThreadLocal也可实现线程安全

ThreadLocal使用示例

public class ThreadLocaDemo {

    private static ThreadLocal<String> localVar = new ThreadLocal<String>();

    static void print(String str) {
        //打印当前线程中本地内存中本地变量的值
        System.out.println(str + " :" + localVar.get());
        //清除本地内存中的本地变量
        localVar.remove();
    }
    public static void main(String[] args) throws InterruptedException {

        new Thread(new Runnable() {
            public void run() {
                ThreadLocaDemo.localVar.set("java265.com-1");
                print("======1");
                //打印本地变量
                System.out.println("after remove : " + localVar.get());
               
            }
        },"A").start();

        Thread.sleep(500);

        new Thread(new Runnable() {
            public void run() {
                ThreadLocaDemo.localVar.set(""java265.com-2"");
                print("======2");
                System.out.println("after remove : " + localVar.get());
              
            }
        },"B").start();
    }
}