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import java.util.Collections;
import java.util.HashSet;
public class Main {
public static void main(String[] args) {
HashSet<Long> hashSet = new HashSet<Long>();
hashSet.add(new Long("9"));
hashSet.add(new Long("4"));
hashSet.add(new Long("2"));
hashSet.add(new Long("2"));
hashSet.add(new Long("3"));
Object obj = Collections.min(hashSet);
System.out.println("Minimum Element of HashSet is : " + obj);
}
}
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