common elements from arrays in java pgm

Find common elements from arrays

import java.util.ArrayList;

 public class Main

 {

   public static void main(String[] args)

   {

      ArrayList objArray = new ArrayList();

      ArrayList objArray2 = new ArrayList();

      objArray2.add(0,"common1");

      objArray2.add(1,"common2");

      objArray2.add(2,"notcommon");

      objArray2.add(3,"notcommon1");

      objArray.add(0,"common1");

      objArray.add(1,"common2");

      objArray.add(2,"notcommon2");

      System.out.println("Array elements of array1"+objArray);

      System.out.println("Array elements of array2"+objArray2);

      objArray.retainAll(objArray2);

      System.out.println("Array1 after retaining common

      elements of array2 & array1"+objArray);

   }

}