Java线程状态中BLOCKED和WAITING的区别

>java -versionjava version "1.6.0_43"Java(TM) SE Runtime Environment (build 1.6.0_43-b01)Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode)

源代码说的很详细了

public enum State {        /**         * Thread state for a thread which has not yet started.         */        NEW,        /**         * Thread state for a runnable thread.  A thread in the runnable         * state is executing in the Java virtual machine but it may         * be waiting for other resources from the operating system         * such as processor.         */        RUNNABLE,        /**         * Thread state for a thread blocked waiting for a monitor lock.         * A thread in the blocked state is waiting for a monitor lock         * to enter a synchronized block/method or          * reenter a synchronized block/method after calling         * {@link Object#wait() Object.wait}.         */        BLOCKED,        /**         * Thread state for a waiting thread.         * A thread is in the waiting state due to calling one of the          * following methods:         * <ul>         *   <li>{@link Object#wait() Object.wait} with no timeout</li>         *   <li>{@link #join() Thread.join} with no timeout</li>         *   <li>{@link LockSupport#park() LockSupport.park}</li>         * </ul>         *          * <p>A thread in the waiting state is waiting for another thread to         * perform a particular action.           *         * For example, a thread that has called <tt>Object.wait()</tt>         * on an object is waiting for another thread to call          * <tt>Object.notify()</tt> or <tt>Object.notifyAll()</tt> on          * that object. A thread that has called <tt>Thread.join()</tt>          * is waiting for a specified thread to terminate.         */        WAITING,        /**         * Thread state for a waiting thread with a specified waiting time.         * A thread is in the timed waiting state due to calling one of          * the following methods with a specified positive waiting time:         * <ul>         *   <li>{@link #sleep Thread.sleep}</li>         *   <li>{@link Object#wait(long) Object.wait} with timeout</li>         *   <li>{@link #join(long) Thread.join} with timeout</li>         *   <li>{@link LockSupport#parkNanos LockSupport.parkNanos}</li>          *   <li>{@link LockSupport#parkUntil LockSupport.parkUntil}</li>         * </ul>         */        TIMED_WAITING,        /**         * Thread state for a terminated thread.         * The thread has completed execution.         */        TERMINATED;    }

总结一下：

• Thread如果是在等待获取锁，此时Thread的状态就是Blocked；
• 其他调用Object.wait,Thread.join,LockSupport.park等都是WAITING或者TIMED_WAITING状态