Add Items | Java | MYTAT

The HashSet class has many useful methods. For example, to add items to it, use the add() method:

Example

// Import the HashSet class
import java.util.HashSet;

public class Main {
  public static void main(String[] args) {
    HashSet<String> cars = new HashSet<String>();
    cars.add("Volvo");
    cars.add("BMW");
    cars.add("Ford");
    cars.add("BMW");
    cars.add("Mazda");
    System.out.println(cars);
  }
}

Note: In the example above, even though BMW is added twice it only appears once in the set because every item in a set has to be unique.

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