Java線(xiàn)程狀態(tài)轉(zhuǎn)換有哪些情況？動(dòng)力節(jié)點(diǎn)小編來(lái)告訴大家。

情況1NEW–>RUNNABLE

?當(dāng)調(diào)用t.start()方法的時(shí)候，由NEW–>Runnable

情況2RUNNABLE<–>WATTING

? t線(xiàn)程用synchronize(obj)獲得對(duì)象鎖后：

? 調(diào)用obj.wait()方法時(shí)，t線(xiàn)程從RUNNABLE–>WAITING

? 調(diào)用obj.notify()，obj.notifyAll，t.interrupt時(shí)：

? 競(jìng)爭(zhēng)鎖成功，t線(xiàn)程WAITING–>RUNNABLE

? 競(jìng)爭(zhēng)鎖失敗，t線(xiàn)程從WAITING–>BLOCKED

@Slf4j(topic = "c.TestWaitNotify")
public class TestWaitNotify {
    final static Object obj = new Object();
    public static void main(String[] args) {
        new Thread(() -> {
            synchronized (obj) {
                log.debug("執(zhí)行....");
                try {
                    obj.wait(); // 讓線(xiàn)程在obj上一直等待下去
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                log.debug("其它代碼....");
            }
        },"t1").start();
        new Thread(() -> {
            synchronized (obj) {
                log.debug("執(zhí)行....");
                try {
                    obj.wait(); // 讓線(xiàn)程在obj上一直等待下去
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                log.debug("其它代碼....");
            }
        },"t2").start();
        // 主線(xiàn)程兩秒后執(zhí)行
        sleep(0.5);
        log.debug("喚醒 obj 上其它線(xiàn)程");
        synchronized (obj) {
//            obj.notify(); // 喚醒obj上一個(gè)線(xiàn)程
            obj.notifyAll(); // 喚醒obj上所有等待線(xiàn)程
        }
    }
}

情況3 RUNNABLE<–>WATTING

當(dāng)前線(xiàn)程調(diào)用t.join()方法時(shí)，當(dāng)前線(xiàn)程從RUNNABLE --> WAITING

注意是從當(dāng)前線(xiàn)程在t線(xiàn)程對(duì)象的監(jiān)視器上等待

t線(xiàn)程運(yùn)行結(jié)束，活調(diào)用了當(dāng)前線(xiàn)程的interrupt()時(shí)，當(dāng)前線(xiàn)程從WAITING–> RUNNNABLE

情況4 RUNNABLE<–>WATTING

當(dāng)前線(xiàn)程調(diào)用LockSupport.park()方法會(huì)讓當(dāng)前線(xiàn)程從RUNNABLE --> WAITING

調(diào)用LockSupport.unpark(目標(biāo)線(xiàn)程)或調(diào)用了線(xiàn)程的interrupt()，會(huì)讓目標(biāo)線(xiàn)程從WAITING -->RUNNABLE

情況5RUNNABLE<–>TIMED_WATTING

t線(xiàn)程用synchronize(obj)獲取了對(duì)象鎖后

調(diào)用obj.wait(long n)方法時(shí)，t線(xiàn)程從RUNABLE -->TIMED_WAITING

t線(xiàn)程等待時(shí)間超過(guò)了n毫秒，或調(diào)用obj.notify(),obj.notifyAll(),t.interrupt時(shí)

競(jìng)爭(zhēng)鎖成功，t線(xiàn)程從TIMED_WAITING -->RUNNABLE

競(jìng)爭(zhēng)鎖失敗，t線(xiàn)程從TIMED_WAITING --> BLOCKED

情況6 RUNNABLE<–>TIMED_WATTING

當(dāng)前線(xiàn)程調(diào)用t.join(long n) 方法是，當(dāng)前線(xiàn)程從RUNNABLE --> TIMED_WAITING

注意是當(dāng)前線(xiàn)程在t線(xiàn)程****對(duì)象的監(jiān)視器上等待

當(dāng)前線(xiàn)程等待時(shí)間超過(guò)了n毫秒，或t線(xiàn)程運(yùn)行結(jié)束，調(diào)用了當(dāng)前線(xiàn)程的interrupt()時(shí)，當(dāng)前線(xiàn)程從TIMED_WAITING --> RUNNABLE

情況7 RUNNABLE<–>TIMED_WATTING

當(dāng)前線(xiàn)程調(diào)用Thread.Sleep(long n) ，當(dāng)前線(xiàn)程從RUNNABLE -->TIMED_WAITING

當(dāng)前線(xiàn)程等待時(shí)間超過(guò)了n毫秒，當(dāng)前線(xiàn)程從TIMED_WAITING -->RUNNABLE

情況8 RUNNABLE<–>TIMED_WATTING

當(dāng)前線(xiàn)程調(diào)用LockSupport.parkNanos(long nanos) 或LockSupport.parkUntil(long millis)時(shí)，當(dāng)前線(xiàn)程從RUNNABLE -->TIMED_WATTING

調(diào)用LockSupport.unpark(目標(biāo)線(xiàn)程)或調(diào)用了線(xiàn)程的interrupt()，或是等待超時(shí)，會(huì)讓目標(biāo)線(xiàn)程從TIMED_WATTING–> RUNNABLE

情況9 RUNNABLE<–>BOLCKED

t線(xiàn)程用synchronized(obj)獲取了對(duì)象鎖時(shí)如果競(jìng)爭(zhēng)失敗，從RUNNABLE -->BLOCKED

持obj鎖線(xiàn)程的同步代碼塊執(zhí)行完畢，會(huì)喚醒該帝鄉(xiāng)上所有的BLOCKED的線(xiàn)程重新競(jìng)爭(zhēng)，如果其中t線(xiàn)程競(jìng)爭(zhēng)成功，從BLOCKED -->RUNNABLE，其他失敗的線(xiàn)程任然BLOCKED

情況10 RUNNABLE<–>TERMINATED

當(dāng)前線(xiàn)程所有代碼運(yùn)行完成，進(jìn)入TERMINATED

–>RUNNABLE，其他失敗的線(xiàn)程任然BLOCKED

情況10 RUNNABLE<–>TERMINATED

當(dāng)前線(xiàn)程所有代碼運(yùn)行完成，進(jìn)入TERMINATED

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