在Java中，线程有以下六种状态：

• NEW：新建状态，表示线程对象已经被创建但还未启动。
• RUNNABLE：可运行状态，表示线程处于就绪状态，等待系统分配CPU资源执行。
• BLOCKED：阻塞状态，表示线程被挂起，暂时无法执行，可能是在等待某个资源（如I/O操作、获取锁）的过程中。
• WAITING：等待状态，表示线程正在等待另一个线程执行特定操作。
• TIMED_WAITING：计时等待状态，表示线程在等待特定时间内执行某个操作。
• TERMINATED：终止状态，表示线程已经执行完任务或者因异常而结束。

这些状态构成了线程的生命周期，在不同的状态间切换，线程会执行不同的行为和任务。理解线程的状态对于编写多线程程序非常重要，可以帮助你控制线程的行为和逻辑。

在 java.lang.Thread.State 这个枚举中给出了六种线程状态:

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;
    }

这里先列出各个线程状态发生的条件，下面将会对每种状态进行详细解析

注意:6种状态是不包含运行状态的.