Java reentrantlock

import java.util.concurrent.locks.ReentrantLock;

public class test{
  public static void main(String[] args)
  {
    ReentrantLock lock = new ReentrantLock();
    
    lock.lock();
    try{
      System.out.println("Only one thread can write this at a time");
    }finally{
      lock.unlock();
    }
  }
}

ReentrantLock java

import java.util.concurrent.locks.ReentrantLock;

public class test{
  public static void main(String[] args)
  {
    ReentrantLock r1 = new ReentrantLock();
    
    r1.lock();
    System.out.println("Only one thread can write this at a time");
    r1.unlock();
  }
}

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