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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("array1 elements: " + objArray);
        System.out.println("array2 elements: " + objArray2);
        objArray.retainAll(objArray2);
        System.out.println("Intersection of array2 & array1: " + objArray);
    }
}

array1 elements: [common1, common2, notcommon2]
array2 elements: [common1, common2, notcommon, notcommon1]
Intersection of array2 & array1: [common1, common2]