Chapter 30 Exercise 11, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

30.11 (Demonstrate deadlock) Write a program that demonstrates deadlock.

public class Exercise11 {

 public static void main(String[] args) {
  Object object1 = new Object();
  Object object2 = new Object();
  new DeadLockThread(object1, object2, 1);
  new DeadLockThread(object2, object1, 2);
 }
 
 static class DeadLockThread implements Runnable {
  Object object1;
  Object object2;
  int threadNumber;
  
  public DeadLockThread(Object object1, Object object2, int threadNumber) {
   this.object1 = object1;
   this.object2 = object2;
   this.threadNumber = threadNumber;
   Thread thread = new Thread(this);
   thread.start();
  }
  
  @Override
  public void run() {
   System.out.println("Thread #" + threadNumber + ": starting");
   while(true) {
    synchronized (object1) {
     System.out.println("Thread #" + threadNumber + ": 1-st synchronized");  
     synchronized (object2) {
      System.out.println("Thread #" + threadNumber + ": 2-nd synchronized");
     }
    }
   }
  }  
 }
}