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import java.util.HashSet;

public class HashSetDemo15h {

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");

boolean b = set2.stream().distinct().anyMatch(s -> s.equals("A"));

boolean c = set2.stream().distinct().allMatch(s -> s.length() == 1);

boolean d = set2.stream().distinct().noneMatch(s -> s.length() == 1);

System.out.println(b);

System.out.println(c);

System.out.println(d);

}

}