ThreadLocal详解

1 ThreadLocal.ThreadLocalMap threadLocals = null;

 1 public T get() {
 2 　　Thread t = Thread.currentThread();
 3 　　ThreadLocalMap map =  getMap(t);
 4 　　if (map != null) {
 5 　　　　ThreadLocalMap.Entry e = map.getEntry(this);
 6 　　　　if (e != null)
 7 　　　　return (T)e.value;
 8 　　}
 9 　　return setInitialValue();
10 }

1 ThreadLocalMap getMap(Thread t) {
2     return t.threadLocals;
3 }

1 static class Entry extends WeakReference<ThreadLocal> {
2 　　/** The value associated with this ThreadLocal. */
3 　　Object value;
4 　　Entry(ThreadLocal k, Object v) {
5 　　super(k);
6 　　value = v;
7 　　}
8 }