Click here to watch in Youtube : https://www.youtube.com/watch?v=PH-f0jqK0Bs&list=UUhwKlOVR041tngjerWxVccwLinkedHashMapExample.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