import java.util.concurrent.locks.Lock;

 import java.util.concurrent.locks.ReadWriteLock;

 import java.util.concurrent.locks.ReentrantReadWriteLock;



 public class TableControl implements Runnable {



     private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();;



     private int i = 0;



     private void add(int v) {

         writeLock().lock();

         i += v;

         System.out.println(i);

         try {

             Thread.sleep(10000);

         } catch (InterruptedException e) {

             e.printStackTrace();

         }

         writeLock().unlock();

     }



     public Lock readLock() {

         return readWriteLock.readLock();

     }



     public Lock writeLock() {

         return readWriteLock.writeLock();

     }



     @Override

     public void run() {

         add(100);

     }
}

public class TestMain {


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