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Example of containsKey method of HashMap.

Example of containsKey method of HashMap.

Example of containsKey method of HashMap.

The containsKey is a method of HashMap class. It always returns boolean value. It checks that the key is present or not in HashMap. 

If the given key is present in map, than is returns true othewise false.



import java.util.HashMap;

public class HashMapContainsKey {

public static void main(String[] arr) {

/* Create object of HashMap */

HashMap<Integer, String> obMap = new HashMap<Integer, String>();

/* Add value in HashMap */

obMap.put(new Integer(1), "Bharat");

obMap.put(new Integer(2), "Gyan");

obMap.put(new Integer(4), "Vrishti");

obMap.put(new Integer(3), "Sarika");

obMap.put(new Integer(5), "Rohit");

obMap.put(new Integer(6), "Parineeta");

/* Check key present in HashMap or not */

System.out.println("Returns :" + obMap.containsKey(1));

System.out.println("Returns :" + obMap.containsKey(8)); } }

Output :

Returns :true

Returns :false


Posted on: April 5, 2011 If you enjoyed this post then why not add us on Google+? Add us to your Circles

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