how to check how many elements in a set java
import java.util.Arrays; import java.util.HashSet; import java.util.Set; /* check a set size by set.size() */ public class MainClass { public static void main(String[] a) { String elements[] = { "A", "B", "C", "D", "E" }; Set set = new HashSet(Arrays.asList(elements)); System.out.println(set.size()); } }