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import java.util.HashSet;

public class HashSetDemo6 {

public static void main(String[] args) {

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

set.add("A");

set.add("a");

set.add("B");

set.add("b");

System.out.println(set);

try {

Boolean a = set.iterator().hasNext();

System.out.println(a);

} catch (Exception e) {

System.out.println("Exception");

}

}

}

//Returns true if the iteration has more elements. (In other words, returns true if next would return an element rather than throwing an exception.)