Example of containsKey method of HashMap.

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Example of containsKey method of HashMap.
Posted on: April 5, 2011 at 12:00 AM

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.

Code:

HashMapContainsKey.java

package net.roseindia.java;

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

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