Code to add data or elements to Set Collection

About Set :

A Set is a Collection that cannot contain duplicate elements.

Java Set is an interface that extends Collection interface.

//Adding null element to Set also possible, based on that we should check for null before doing any Set operation

names.add(null);

// Adding Strings elements in Set

Set<String> names = new HashSet<>();

names.add("Pavan");

names.add("Tilak");

if (names.add("Pavan")) {

    System.out.println("Pavan is added to the set");

}

if (!names.add("Tilak")) {

    System.out.println("Tilak is already added to the set");

}