HashSetSimpleOperationsExample.java

importjava.util.HashSet;
importjava.util.Set;

publicclassHashSetSimpleOperationsExample {
publicstaticvoidmain(String[] args) {
Set<String> popularCities = newHashSet<>();

// Check if a HashSet is empty
System.out.println("Is popularCities set empty? : " + popularCities.isEmpty());

popularCities.add("London");
popularCities.add("New York");
popularCities.add("Paris");
popularCities.add("Dubai");

// Find the size of a HashSet
System.out.println("Number of cities in the HashSet " + popularCities.size());

// Check if the HashSet contains an element
StringcityName = "Paris";
if(popularCities.contains(cityName)) {
System.out.println(cityName + " is in the popular cities set.");
 } else {
System.out.println(cityName + " is not in the popular cities set.");
 }
 }
}