Answer:
The program below shows how to compare the two list and find the common elements between them. We are using iterator method and retainAll() method to find the common element.
Common_Elements.java
import java.util.*;
class Common_Elements
{
public static void main(String[] args)
{
String str1[] = {"One", "Two", "Three", "Four", "Five", "Six"};
String str2[] = {"Two", "Four", "Six", "Eight", "Ten"};
//Using iterator methods to find common elements
System.out.println("Using iterator methods to find common elements");
HashSet<String> hs = new HashSet<String>();
for (int i=0; i< str1.length; i++)
{
for (int j=0; j< str2.length; j++)
{
if (str1[i].equals(str2[j]))
{
hs.add(str1[i]);
}
}
}
System.out.println(hs);
System.out.println("**=====================**=====================**");
System.out.println("Using retailAll() method to find common elements.");
HashSet<String> set1 = new HashSet<>(Arrays.asList(str1));
HashSet<String> set2 = new HashSet<>(Arrays.asList(str2));
set1.retainAll(set2);
System.out.println(set1);
System.out.println("**=====================**=====================**");
}
}
Output:
