1, we can use to verify the next wait notify and notifyAll to wake up
Test code as follows:
public class WaitSleepDemo {
public static void main(String[] args) {
final Object lock = new Object();
new Thread(new Runnable() {
@Override
public void run() {
System.out.println("thread A is waiting to get lock");
synchronized (lock){
try {
System.out.println("thread A get lock");
Thread.sleep(20);
System.out.println("thread A do wait method");
//无限期的等待
lock.wait();
//Thread.sleep(1000);
System.out.println("thread A is done");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
//为了让Thread A 先于Thread B执行
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
new Thread(new Runnable() {
@Override
public void run() {
System.out.println("thread B is waiting to get lock");
synchronized (lock){
try {
System.out.println("thread B get lock");
System.out.println("thread B is sleeping 10 ms");
Thread.sleep(10);
Lock.wait // (10);
System.out.println ( "Thread B IS DONE");
// phrase commented, thread A is done will not be printed
lock.notify (); // lock.notifyAll ();
} the catch (InterruptedException E) {
e.printStackTrace ();
}
}
}
.}) Start ();
}
}
Results of the:
thread A is waiting to get lock thread A get lock thread B is waiting to get lock thread A do wait method thread B get lock thread B is sleeping 10 ms thread B is done thread A is done
2, the difference notify and notifAll
Two concepts
锁池EntryList
Wait pool WaitSet