1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
/* 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 */ |
Add Comment