import java.util.HashMap;
public class Main {
public static void main(String[] args) {
HashMap hMap = new HashMap();
hMap.put("1", "One");
hMap.put("2", "Two");
hMap.put("3", "Three");
boolean blnExists = hMap.containsKey("3");
System.out.println("3 exists in HashMap ? : " + blnExists);
}
}