java initialize hashset

/**
 * @author lautturi.com 
 * Java example: add values into hashset/ initialize in java
 */

import java.util.*;

public class Lautturi {
	public static void main(String[] args) {
		Set<Integer> set = new HashSet<>();
		set.add(1);
		set.add(2);
		set.add(3);
		
		Set<String> strSet = Set.of("Apple", "Banana", "Cherry", "Orange", "Lauttur1");

		Set<String> set2 = new HashSet<>(Arrays.asList("a", "b", "c","d"));
		
		System.out.println(set);
		System.out.println(strSet);
		System.out.println(set2);
	}
}

output:

[1, 2, 3]
[Cherry, Orange, Apple, Banana, Lauttur1]
[a, b, c, d]