import java.util.concurrent.locks.Lock;

 import java.util.concurrent.locks.ReadWriteLock;

 import java.util.concurrent.locks.ReentrantReadWriteLock;



 public class TableControl {



     private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();;



     private int i = 0;



     public void add(int v) {

         i += v;

         System.out.println(i);

         try {

             Thread.sleep(10000);

         } catch (InterruptedException e) {

             e.printStackTrace();

         }

     }



     public Lock readLock() {

         return readWriteLock.readLock();

     }



     public Lock writeLock() {

         return readWriteLock.writeLock();

     }

}

public class TestMain implements Runnable{


     TableControl tc=new TableControl();


     
     public static void main(String args[]){
        
         
         TestMain tm=new TestMain();
         Thread t1 =new Thread(tm);
         Thread t2 =new Thread(tm);
         
         
         t1.start();
         t2.start();
         }


     @Override
     public void run() {
         tc.writeLock().lock();
         tc.add(100);
         tc.writeLock().unlock();
     } 
     
     
 }