Java : Collection Framework : LinkedHashMap (ContainsKey)

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LinkedHashMapExample.java

import java.util.LinkedHashMap;

/*
 * Example of containsKey(Object key) method.
 */
public class LinkedHashMapExample
{
    public static void main( String[] args )
    {

        LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<Integer, String>();

        linkedHashMap.put(1, "Apple");
        linkedHashMap.put(3, "Cat");
        linkedHashMap.put(2, "Ball");

        System.out.println("linkedHashMap : " + linkedHashMap+"\n");

        /*
         * Returns true if this map contains a mapping for the specified key.
         */
        boolean isKeyExist = linkedHashMap.containsKey(1);

        System.out.println("isKey '1' Exist : " + isKeyExist);

        isKeyExist = linkedHashMap.containsKey(10);

        System.out.println("isKey '10' Exist : " + isKeyExist);

    }
}

Output

linkedHashMap : {1=Apple, 3=Cat, 2=Ball}

isKey '1' Exist : true
isKey '10' Exist : false

To Download LinkedHashMapDemoContainsKey Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/LinkedHashMapDemoContainsKey.zip?attredirects=0&d=1

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