Check if a particular key exists in Java HashMap example

/*
  Check if a particular key exists in Java HashMap example
  This Java Example shows how to check if HashMap object contains a particular
  key using containsKey method of HashMap class.
*/
 
import java.util.HashMap;
 
public class CheckKeyOfHashMapExample {
 
  public static void main(String[] args) {
 
    //create HashMap object
    HashMap hMap = new HashMap();
 
    //add key value pairs to HashMap
    hMap.put("1","One");
    hMap.put("2","Two");
    hMap.put("3","Three");
 
    /*
      To check whether a particular key exists in HashMap use
      boolean containsKey(Object key) method of HashMap class.
      It returns true if the HashMap contains mapping for specified key
      otherwise false.
    */
 
    boolean blnExists = hMap.containsKey("3");
    System.out.println("3 exists in HashMap ? : " + blnExists);
  }
}
 
/*
Output would be
3 exists in HashMap ? : true
*/