Use the contains() method to check if a particular element exists −
Set<Integer> hs = new HashSet<Integer>(); hs.add(30); hs.add(67); hs.add(88); hs.add(33); hs.add(54); hs.add(90); hs.add(66); hs.add(79);
To check for let’s say, element 89, use the contains() method −
hs.contains(89));
The following is an example to check if a particular element exists in HashSet −
import java.util.*; public class Demo { public static void main(String args[]) { // create hash set Set<Integer> hs = new HashSet<Integer>(); hs.add(30); hs.add(67); hs.add(88); hs.add(33); hs.add(54); hs.add(90); hs.add(66); hs.add(79); System.out.println("Elements in set = "+hs); System.out.println("Does 89 in the set? "+hs.contains(89)); System.out.println("Does 67 in the set? "+hs.contains(67)); } }
Elements in set = [33, 66, 67, 54, 88, 90, 30, 79] Does 89 in the set? false Does 67 in the set? True