Determine thread hold synchronized lock in java

Source code below will print true if current thread hold synchronized lock for current object and print false for otherwise.

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COMPLETE SOURCE CODE FOR : DetermineThreadHoldSynchronizedLock.java
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//This program will print three value whether current thread hold synchronized lock
//for cuurent object or not.
public class DetermineThreadHoldSynchronizedLock
{
boolean isLock;

public DetermineThreadHoldSynchronizedLock()
{
 //Check whether current thread hold synchronized lock for current object
 isLock=Thread.holdsLock(this);

 //Print lock value
 //It should print false
 System.out.println("HOLD SYNCHRONIZED : "+isLock);

 //Go to method locker()
 locker();
}

public void locker()
{
 //Current thread get lock from current object
 //It's mean other thread can't interrupt untill this thread get out from
 //synchronized block,{}...like below
 synchronized (this)
 {
  isLock=Thread.holdsLock(this);
  //Print lock value
  //It should print true
  System.out.println("HOLD SYNCHRONIZED : "+isLock);
 }
 lastCheck();
}

public void lastCheck()
{
 //Check whether current thread hold synchronized lock for current object
 isLock=Thread.holdsLock(this);
 //Print lock value
 //It should print false
 System.out.println("HOLD SYNCHRONIZED : "+isLock);
}

public static void main(String[]args)
{
 DetermineThreadHoldSynchronizedLock dthsl=new DetermineThreadHoldSynchronizedLock();
}
}

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JUST COMPILE AND EXECUTE IT
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