public class HashSetDemo
1: import java.util.HashSet;
2:
3: public class HashSetDemo
4: {
5: public static void main(String[] args)
6: {
7: HashSet<Integer> intSet = new HashSet<Integer>();
8:
9: intSet.add(2);
10: intSet.add(7);
11: intSet.add(7); // Ignored since 7 is already in the set
12: intSet.add(3);
13: printSet(intSet);
14:
15: intSet.remove(3);
16: printSet(intSet);
17:
18: System.out.println("Set contains 2: " +
19: intSet.contains(2));
20: System.out.println("Set contains 3: " +
21: intSet.contains(3));
22: }
23:
24: public static void printSet(HashSet<Integer> intSet)
25: {
26: System.out.println("The set contains:");
27: for (Object obj : intSet.toArray())
28: {
29: Integer num = (Integer) obj;
30: System.out.println(num.intValue());
31: }
32: }
33: }