- 有哪6种状态？
- 每个状态是什么含义
- 状态间的转化图示
- 阻塞状态是什么
每个状态是什么含义
- New
- Runnable
- Blocked
- Waiting
- Timed Waiting
- Terminated
https://www.jianshu.com/p/dfdc150a3e54
image.png
展示线程的NEW、RUNNABLE、Terminated状态
/**
* 描述： 展示线程的NEW、RUNNABLE、Terminated状态。即使是正在运行，也是Runnable状态，而不是Running。
*/
public class NewRunnableTerminated implements Runnable {
public static void main(String[] args) {
Thread thread = new Thread(new NewRunnableTerminated());
//打印出NEW的状态
System.out.println(thread.getState());
thread.start();
System.out.println(thread.getState());
try {
Thread.sleep(6);
} catch (InterruptedException e) {
e.printStackTrace();
}
//打印出RUNNABLE的状态，即使是正在运行，也是RUNNABLE，而不是RUNNING
System.out.println(thread.getState());
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
//打印出TERMINATED状态
System.out.println(thread.getState());
}
@Override
public void run() {
for (int i = 0; i < 1000; i++) {
System.out.println(i);
}
}
}
NEW
RUNNABLE
0
1
2
... 省略
294
295
RUNNABLE
296
297
298
... 省略
998
999
TERMINATED
Process finished with exit code 0
展示Blocked, Waiting, TimedWaiting
/**
* 描述： 展示Blocked, Waiting, TimedWaiting
*/
public class BlockedWaitingTimedWaiting implements Runnable{
public static void main(String[] args) {
BlockedWaitingTimedWaiting runnable = new BlockedWaitingTimedWaiting();
Thread thread1 = new Thread(runnable);
thread1.start();
try {
Thread.sleep(5);
} catch (InterruptedException e) {
e.printStackTrace();
}
Thread thread2 = new Thread(runnable);
thread2.start();
//打印出Timed_Waiting状态，因为正在执行Thread.sleep(1000);
System.out.println(thread1.getState());
//打印出BLOCKED状态，因为thread2想拿得到sync()的锁却拿不到
System.out.println(thread2.getState());
try {
Thread.sleep(1300);
} catch (InterruptedException e) {
e.printStackTrace();
}
//打印出WAITING状态，因为执行了wait()
System.out.println(thread1.getState());
}
@Override
public void run() {
syn();
}
private synchronized void syn() {
try {
Thread.sleep(1000);
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
TIMED_WAITING
BLOCKED
WAITING
阻塞状态
一般习惯而言，把Blocked（被阻塞）、Waiting（等待）、Timed_waiting（即使等待）都成为阻塞状态
- 不仅仅是Blocked
