Java.lang ThreadLocal

1 Java.lang ThreadLocal介绍

Java ThreadLocal类提供线程局部变量。它使您能够创建只能由同一线程读取和写入的变量。如果两个线程正在执行相同的代码，并且该代码引用了ThreadLocal变量，则两个线程将看不到彼此的本地变量。

2 Java.lang ThreadLocal声明

public class ThreadLocal<T>
   extends Object

3 Java.lang ThreadLocal方法

4 Java.lang ThreadLocal案例

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
public class ThreadLocalExp  
{  
    public static class MyRunnable implements Runnable   
    {  
        private ThreadLocal<Integer> threadLocal =  
               new ThreadLocal<Integer>();  
        @Override  
        public void run() {  
            threadLocal.set( (int) (Math.random() * 50D) );  
            try   
            {  
                Thread.sleep(1000);  
            } catch (InterruptedException e) {  
            }  
            System.out.println(threadLocal.get());  
        }  
    }  
    public static void main(String[] args)   
    {  
        MyRunnable runnableInstance = new MyRunnable();  
          
        Thread t1 = new Thread(runnableInstance);  
        Thread t2 = new Thread(runnableInstance);  
        // this will call run() method   
        t1.start();  
        t2.start();  
    }  
}

输出结果为：

10
33