Java线程状态举例分析
本篇内容主要讲解“Java线程状态举例分析”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Java线程状态举例分析”吧!
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下面就一些场景分析锁和线程的状态
1、 线程1获得锁后不释放，就是运行状态（RUNNABLE），线程2就是休眠状态TIMED_WAITING (sleeping)
package com.example.demo.thread.threadstate;
public class ThreadState1 implements Runnable{
@Override
public void run() {
System.out.println("ThreadState1---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState1---get---lock");
while(true){}
}catch (Exception e){
}
}
}
}
package com.example.demo.thread.threadstate;
public class ThreadState2 implements Runnable {
@Override
public void run() {
try {
Thread.sleep(30000);
}catch (Exception e){
}
}
}"Thread-1" #13 prio=5 os_prio=0 tid=0x000000001a51b800 nid=0x42b8 waiting on condition [0x000000001b47f000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at com.example.demo.thread.threadstate.ThreadState2.run(ThreadState2.java:14) at java.lang.Thread.run(Thread.java:748) Locked ownable synchronizers: - None "Thread-0" #12 prio=5 os_prio=0 tid=0x000000001a51b000 nid=0x6d5c runnable [0x000000001b37e000] java.lang.Thread.State: RUNNABLE at com.example.demo.thread.threadstate.ThreadState1.run(ThreadState1.java:10) - locked <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748)
2、线程1获得锁后不释放，就是运行状态（RUNNABLE），线程2未获得锁就是阻塞状态（BLOCKED）
package com.example.demo.thread.threadstate;
public class ThreadState1 implements Runnable{
@Override
public void run() {
System.out.println("ThreadState1---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState1---get---lock");
while(true){}
}catch (Exception e){
}
}
}
}
package com.example.demo.thread.threadstate;
import sun.misc.Unsafe;
public class ThreadState2 implements Runnable {
@Override
public void run() {
try {
Thread.sleep(30000);
}catch (Exception e){
}
System.out.println("ThreadState2---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState2---get---lock");
}catch (Exception e){
}
ThreadStateTest.class.notify();
}
System.out.println("ThreadState2---end");
}
}"Thread-1" #13 prio=5 os_prio=0 tid=0x000000001a51b800 nid=0x42b8 waiting for monitor entry [0x000000001b47f000] java.lang.Thread.State: BLOCKED (on object monitor) at com.example.demo.thread.threadstate.ThreadState2.run(ThreadState2.java:21) - waiting to lock <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748) Locked ownable synchronizers: - None "Thread-0" #12 prio=5 os_prio=0 tid=0x000000001a51b000 nid=0x6d5c runnable [0x000000001b37e000] java.lang.Thread.State: RUNNABLE at com.example.demo.thread.threadstate.ThreadState1.run(ThreadState1.java:10) - locked <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748)
3、线程1获得锁后sleep，就是休眠状态TIMED_WAITING (sleeping)，线程2未获得锁就是阻塞状态（BLOCKED），这说明sleep不释放锁
package com.example.demo.thread.threadstate;
public class ThreadState1 implements Runnable{
@Override
public void run() {
System.out.println("ThreadState1---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState1---get---lock");
System.out.println("ThreadState1---begin---sleep");
Thread.sleep(30000);
System.out.println("ThreadState1---end---sleep");
}catch (Exception e){
}
}
}
}
package com.example.demo.thread.threadstate;
import sun.misc.Unsafe;
public class ThreadState2 implements Runnable {
@Override
public void run() {
try {
Thread.sleep(5000);
}catch (Exception e){
}
System.out.println("ThreadState2---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState2---get---lock");
}catch (Exception e){
}
ThreadStateTest.class.notify();
}
System.out.println("ThreadState2---end");
}
}"Thread-1" #13 prio=5 os_prio=0 tid=0x000000001aea0800 nid=0x33c waiting for monitor entry [0x000000001bdef000] java.lang.Thread.State: BLOCKED (on object monitor) at com.example.demo.thread.threadstate.ThreadState2.run(ThreadState2.java:17) - waiting to lock <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748) Locked ownable synchronizers: - None "Thread-0" #12 prio=5 os_prio=0 tid=0x000000001ae86000 nid=0xb50 waiting on condition [0x000000001bcef000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at com.example.demo.thread.threadstate.ThreadState1.run(ThreadState1.java:11) - locked <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748)
4、线程1获得锁后wait，就是等待状态WAITING (on object monitor)，线程2sleep就是休眠状态TIMED_WAITING (sleeping)
package com.example.demo.thread.threadstate;
public class ThreadState1 implements Runnable{
@Override
public void run() {
System.out.println("ThreadState1---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState1---get---lock");
System.out.println("ThreadState1---begin---wait");
ThreadStateTest.class.wait();
System.out.println("ThreadState1---end---wait");
}catch (Exception e){
}
}
}
}
package com.example.demo.thread.threadstate;
import sun.misc.Unsafe;
public class ThreadState2 implements Runnable {
@Override
public void run() {
try {
Thread.sleep(5000);
}catch (Exception e){
}
System.out.println("ThreadState2---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState2---get---lock");
Thread.sleep(20000);
}catch (Exception e){
}
ThreadStateTest.class.notify();
}
System.out.println("ThreadState2---end");
}
}"Thread-1" #13 prio=5 os_prio=0 tid=0x000000001ae49800 nid=0x73c8 waiting on condition [0x000000001bd4f000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at com.example.demo.thread.threadstate.ThreadState2.run(ThreadState2.java:18) - locked <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748) Locked ownable synchronizers: - None "Thread-0" #12 prio=5 os_prio=0 tid=0x000000001ae3d000 nid=0x6d18 in Object.wait() [0x000000001bc4f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Object.wait(Object.java:502) at com.example.demo.thread.threadstate.ThreadState1.run(ThreadState1.java:11) - locked <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748)
5、线程1获得锁后wait，就是等待状态TIMED_WAITING (on object monitor)，线程2sleep就是休眠状态TIMED_WAITING (sleeping)
package com.example.demo.thread.threadstate;
public class ThreadState1 implements Runnable{
@Override
public void run() {
System.out.println("ThreadState1---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState1---get---lock");
System.out.println("ThreadState1---begin---wait");
ThreadStateTest.class.wait(4000);
System.out.println("ThreadState1---end---wait");
}catch (Exception e){
}
}
}
}
package com.example.demo.thread.threadstate;
import sun.misc.Unsafe;
public class ThreadState2 implements Runnable {
@Override
public void run() {
try {
Thread.sleep(5000);
}catch (Exception e){
}
System.out.println("ThreadState2---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState2---get---lock");
Thread.sleep(20000);
}catch (Exception e){
}
ThreadStateTest.class.notify();
}
System.out.println("ThreadState2---end");
}
}"Thread-1" #13 prio=5 os_prio=0 tid=0x000000001ac1b800 nid=0x6274 waiting on condition [0x000000001bb4f000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at com.example.demo.thread.threadstate.ThreadState2.run(ThreadState2.java:18) - locked <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748) Locked ownable synchronizers: - None "Thread-0" #12 prio=5 os_prio=0 tid=0x000000001ac1b000 nid=0x4654 in Object.wait() [0x000000001ba4f000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at com.example.demo.thread.threadstate.ThreadState1.run(ThreadState1.java:11) - locked <0x00000000d63ffac0> (a java.lang.Class for com.example.demo.thread.threadstate.ThreadStateTest) at java.lang.Thread.run(Thread.java:748)
6、线程1获得锁后wait，释放锁，线程2获得锁，释放锁后，线程1获得锁继续执行
package com.example.demo.thread.threadstate;
public class ThreadState1 implements Runnable{
@Override
public void run() {
System.out.println("ThreadState1---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState1---get---lock");
System.out.println("ThreadState1---begin---wait");
ThreadStateTest.class.wait(10000);
System.out.println("ThreadState1---end---wait");
}catch (Exception e){
}
}
}
}
package com.example.demo.thread.threadstate;
import sun.misc.Unsafe;
public class ThreadState2 implements Runnable {
@Override
public void run() {
try {
Thread.sleep(5000);
}catch (Exception e){
}
System.out.println("ThreadState2---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState2---get---lock");
Thread.sleep(20000);
}catch (Exception e){
}
ThreadStateTest.class.notify();
}
System.out.println("ThreadState2---end");
}
}ThreadState1---begin---lock ThreadState1---get---lock ThreadState1---begin---wait ThreadState2---begin---lock ThreadState2---get---lock ThreadState2---end ThreadState1---end---wait
7、线程2ThreadStateTest.class.notify()报错，在释放锁后不能notify
package com.example.demo.thread.threadstate;
public class ThreadState1 implements Runnable{
@Override
public void run() {
System.out.println("ThreadState1---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState1---get---lock");
System.out.println("ThreadState1---begin---wait");
ThreadStateTest.class.wait();
System.out.println("ThreadState1---end---wait");
}catch (Exception e){
}
}
}
}
package com.example.demo.thread.threadstate;
import sun.misc.Unsafe;
public class ThreadState2 implements Runnable {
@Override
public void run() {
try {
Thread.sleep(5000);
}catch (Exception e){
}
System.out.println("ThreadState2---begin---lock");
synchronized (ThreadStateTest.class){
try {
System.out.println("ThreadState2---get---lock");
Thread.sleep(20000);
}catch (Exception e){
}
}
ThreadStateTest.class.notify();
System.out.println("ThreadState2---end");
}
}Exception in thread "Thread-1" java.lang.IllegalMonitorStateException at java.lang.Object.notify(Native Method) at com.example.demo.thread.threadstate.ThreadState2.run(ThreadState2.java:23) at java.lang.Thread.run(Thread.java:748)
到此，相信大家对“Java线程状态举例分析”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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