java线程之InheritableThreadLocal

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hreadLocal和InheritableThreadLocal区别，可以用代码测试一下：

在CODE上查看代码片派生到我的代码片

    package com.lang;      import junit.framework.TestCase;      import static java.lang.System.out;      public class TestInheritableThreadLocal extends TestCase {          public void testThreadLocal() {              final ThreadLocal<String> local = new ThreadLocal<String>();              work(local);          }          public void testInheritableThreadLocal() {              final ThreadLocal<String> local = new InheritableThreadLocal<String>();              work(local);          }          private void work(final ThreadLocal<String> local) {              local.set("a");              out.println(Thread.currentThread() + "," + local.get());              Thread t = new Thread(new Runnable() {                  @Override                  public void run() {                      out.println(Thread.currentThread() + "," + local.get());                      local.set("b");                      out.println(Thread.currentThread() + "," + local.get());                  }              });              t.start();              try {                  t.join();              } catch (InterruptedException e) {                  e.printStackTrace();              }              out.println(Thread.currentThread() + "," + local.get());          }      }

运行testThreadLocal，输出：

    Thread[main,5,main],a      Thread[Thread-0,5,main],null      Thread[Thread-0,5,main],b      Thread[main,5,main],a

运行testInheritableThreadLocal，输出：

    Thread[main,5,main],a      Thread[Thread-0,5,main],a      Thread[Thread-0,5,main],b      Thread[main,5,main],a

比较后，看到ThreadLocal里的值，子线程里不能获得；InheritableThreadLocal里的值，子线程可以获得。

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