Java 从数组查找对象

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");
      System.out.println("Array elements of array1"+objArray);
      System.out.println("Array elements of array2"+objArray2);
      System.out.println("Array 1 contains String common2?? "
         +objArray.contains("common1"));
      System.out.println("Array 2 contains Array1?? "
         +objArray2.contains(objArray) );
   }
}