1. 成员变量

1. AtomicInteger nextHashCode获得下个hashcode

2. 成员函数

1. get()从ThreadLocalMap中取元素ThreadLocalMap.Entry,ThreadLocalMap没有元素时，设置初始化值

       private T setInitialValue() {
           T value = initialValue();
           Thread t = Thread.currentThread();
           ThreadLocalMap map = getMap(t);
           if (map != null)
               map.set(this, value);
           else
               createMap(t, value);
           return value;
       }
   

2. remove()从ThreadLocalMap中remove(this)

3. 内部类

1. static final class SuppliedThreadLocal<T> extends ThreadLocal<T>在ThreadLocal默认初始化时使用

       public static <S> ThreadLocal<S> withInitial(Supplier<? extends S> supplier) {
           return new SuppliedThreadLocal<>(supplier);
       }
   
   

2. static class ThreadLocalMap类用于存储数据，此类中还有静态类

       static class Entry extends WeakReference<ThreadLocal<?>> {
           /** The value associated with this ThreadLocal. */
           Object value;
   
           Entry(ThreadLocal<?> k, Object v) {
               super(k);
               value = v;
           }
       }