HashSet के साथ काम करना

// Import HashSet
mport java.____.____;

public class Sizes {

	public static void main(String[] args) {
    	// Create a HashSet of Integer using parameterized constructor
        ____<____> heights = new ____<____>();
		heights.add(72);
        // Add 64 to the set
        heights.____(____);
		heights.add(66);
		heights.remove(64);
        // Add null to the set
        heights.____(____);
		System.out.println(heights);
	}
}