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import java.util.HashSet;

public class HashSetDemo21 {

public static void main(String[] args) {

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

set.add("A");

set.add("a");

set.add("B");

set.add("b");

Boolean b = set.isEmpty();

System.out.println(b);

set.clear();

Boolean c = set.isEmpty();

System.out.println(c);

}

}