/*
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
*/
