Java中的ThreadLocal.md

####Java中的ThreadLocal 在Java中的ThreadLocal类允许你创建的变量只被同一个线程读和写。因此，即使两个线程执行同样的代码，代码中有一个ThreadLocal类型的变量，两个线程相互之间也不能“看到”对方的ThreadLocal类型的变量、

#####创建一个ThreadLocal

private ThreadLocal myThreadLocal = new ThreadLocal();

#####操作一个ThreadLocal

myThreadLocal.set("A thread local value");

String threadLocalValue = (String)myThreadLocal.get();

#####泛型的ThreadLocal

private ThreadLocal myThreadLocal = new ThreadLocal<String>();
myThreadLocal.set("Hello ThreadLocal");
String threadLocalValue = myThreadLocal.get();

#####初始化ThreadLocal值

private ThreadLocal myThreadLocal = new ThreadLocal<String>(){
    @Override
    protected String initialValue(){
	    return "This is the initial value";
    }
}

初始值对所有线程可见。