/*
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
*/
