Check if a particular key exists in Java Hashtable example

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