What is the Thread holdsLock() function in Java?

Thread.holdsLock() is a staticstatic indicates that the particular member belongs to a type itself, rather than to an instance of that type. function that returns true if the existing thread contains the monitor lock on a defined object. Otherwise, the function returns false.

Syntax

static boolean holdsLock(Object obj)

Parameters

obj: the objects for testing the lock possession

Return value

boolean_value: This method returns true if and only if the existing thread contains a monitor lock on the argument object. Otherwise, holdsLock() returns false.

// import Thread class from package
import java.lang.Thread;
// Main class
public class EdPresso implements Runnable {
   
   Thread thread; // our thread
   
   public EdPresso() {
      thread = new Thread(this);
      
      // it will help to call run() method
      thread.start();
   }
   
   public void run() {
      /* it will return true if current thread
      contains any monitor lock on defined object */
      
      System.out.println("Before Locking:");
      System.out.println("Holds Lock = " + Thread.holdsLock(this));  
      
      synchronized(this) {
         System.out.println("After Locking:");    
         System.out.println("Holds Lock = " + Thread.holdsLock(this));
      }
      
      System.out.println("After Unlocking:");
      System.out.println("Holds Lock = " + Thread.holdsLock(this));
      
   }
   public static void main(String[] args) {
      new EdPresso();
   }
}

What is the Thread holdsLock() function in Java?

Syntax

Parameters

Return value

Exception

Code

Explanation