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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	    public static void main (String[] args) throws java.lang.Exception
  11.     {
  12.         final Object globalLock = new Object();
  13.         Thread t1  = new Thread(new Runnable() {
  14.             @Override
  15.             public void run() {
  16.                 synchronized (globalLock) {
  17.                     System.out.println("thread1 grabbed the lock.");
  18.                     try {
  19.                         Thread.sleep(3000);
  20.                     } catch (InterruptedException e) {
  21.                         e.printStackTrace();
  22.                     }
  23.                     System.out.println("thread1 returned the lock.");
  24.                 }
  25.             }
  26.         });
  27.         t1.start();
  28.  
  29.         Thread.sleep(200);
  30.  
  31.         Thread t2 = new Thread(new Runnable() {
  32.             @Override
  33.             public void run() {
  34.                 System.out.println("thread2 is waiting for the lock...");
  35.                 synchronized (globalLock) {
  36.                     System.out.println("thread2 got the lock");
  37.                 }
  38.             }
  39.         });
  40.         t2.start();
  41.         t1.join();
  42.         t2.join();
  43.     }
  44. }
Success #stdin #stdout 0.1s 320960KB
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stdin
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Standard input is empty
stdout
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thread1 grabbed the lock.
thread2 is waiting for the lock...
thread1 returned the lock.
thread2 got the lock
https://ideone.com/WIsSOi
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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