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 :