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/* 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 */ |
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