ThreadLocal线程隔离

 package com.cookie.test;
 import java.util.concurrent.atomic.AtomicInteger;
 /**
  * author : cxq
  * Date : 2019/6/20
  * 测试ThreadLocal线程隔离
  */
 public class ThreadLocalTest {
     private static ThreadLocal<Integer> threadLocal = new ThreadLocal<>();
     private static AtomicInteger a = new AtomicInteger(100);
     private static int b = 100 ;
     public static void main(String[] args) {
         new Thread(() -> {
             try {
                 for (int i = 0; i < 100; i++) {
                     threadLocal.set(i);
 // a.decrementAndGet();
                     b -- ;
                     System.out.println(Thread.currentThread().getName() + "====" + threadLocal.get());
 // System.out.println(Thread.currentThread().getName() + "====" + a.get());
 // System.out.println(Thread.currentThread().getName() + "====" + b);
                     try {
                         Thread.sleep(100);
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                 }
             } finally {
                 threadLocal.remove();
             }
         }, "threadLocal1").start();
         new Thread(() -> {
             try {
                 for (int i = 0; i < 100; i++) {
                     System.out.println(Thread.currentThread().getName() + "====" + threadLocal.get());
 // System.out.println(Thread.currentThread().getName() + "====" + a.get());
                     System.out.println(Thread.currentThread().getName() + "====" + b);
                     try {
                         Thread.sleep(100);
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                 }
             } finally {
                 threadLocal.remove();
             }
         }, "threadLocal2").start();
     }
 }

输出结果展示：

如果采用AtomicInteger a 或者常量 int b :