Java tutorial
import java.util.Arrays; import java.util.HashSet; import java.util.Set; public class Main { public static void main(String[] a) { String elements[] = { "A", "B", "C", "D", "E" }; Set<String> set = new HashSet<String>(Arrays.asList(elements)); elements = new String[] { "B", "D", "F", "G", "1", "2", "3", "4" }; Set<String> set2 = new HashSet<String>(Arrays.asList(elements)); set.removeAll(set2); System.out.println(set); } }