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java线程之InheritableThreadLocal
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ThreadLocal和InheritableThreadLocal區別，可以用代碼測試一下：
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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());??????}??}??
運行testThreadLocal，輸出：
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Thread[main,5,main],a??Thread[Thread-0,5,main],null??Thread[Thread-0,5,main],b??Thread[main,5,main],a??
運行testInheritableThreadLocal，輸出：
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Thread[main,5,main],a??Thread[Thread-0,5,main],a??Thread[Thread-0,5,main],b??Thread[main,5,main],a??
比較后，看到ThreadLocal里的值，子線程里不能獲得；InheritableThreadLocal里的值，子線程可以獲得。
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