##http://www.cnblogs.com/dolphin0520/p/3920407.html

##ThreadLocal，很多地方叫做线程本地变量，也有些地方叫做线程本地存储，其实意思差不多。

##可能很多朋友都知道ThreadLocal为变量在每个线程中都创建了一个副本，那么每个线程可以访问自己内部的副本变量。

#ThreadLocal是一个本地线程变量，本次线程的全局变量，本次线程的任何地方都可以调用，一旦本次线程结束，ThreadLocal就销毁

package demo;

/**

* Created by Administrator on 2018/4/8.

*/

public class Test {

ThreadLocal<Long> longLocal = new ThreadLocal<Long>();

ThreadLocal<String> stringLocal = new ThreadLocal<String>();

public void set() {

longLocal.set(Thread.currentThread().getId());

stringLocal.set(Thread.currentThread().getName());

}

public long getLong() {

return longLocal.get();

}

public String getString() {

return stringLocal.get();

}

public static void main(String[] args) throws InterruptedException {

final Test test = new Test();

test.set();

System.out.println(test.getLong());

System.out.println(test.getString());

Thread thread1 = new Thread(){

public void run() {

test.set();

System.out.println(test.getLong());

System.out.println(test.getString());

};

};

thread1.start();

thread1.join();

System.out.println(test.getLong());

System.out.println(test.getString());

}

}