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import java.util.HashSet;

public class HashSetDemo15l {

public static void main(String[] args) {

HashSet<Integer> set1 = new HashSet<>();

HashSet<String> set2 = new HashSet<>();

set1.add(1);

set1.add(2);

set1.add(3);

set1.add(4);

set2.add("A");

set2.add("a");

set2.add("B");

set2.add("b");

set2.add("C");

set2.add("c");

set1.stream().findFirst().ifPresent(s -> System.out.println(s));

set1.stream().findFirst().ifPresent(System.out::println);

}

}