Click here to watch in Youtube :
https://www.youtube.com/watch?v=zvFQxPFv8G8&list=UUhwKlOVR041tngjerWxVccw
HashMapExample.java
Output
https://www.youtube.com/watch?v=zvFQxPFv8G8&list=UUhwKlOVR041tngjerWxVccw
HashMapExample.java
import java.util.HashMap; /* * Example of containsKey(Object key) method. */ public class HashMapExample { public static void main( String[] args ) { HashMap<Integer, String> hashMap = new HashMap<Integer, String>(); hashMap.put(1, "Apple"); hashMap.put(2, "Ball"); hashMap.put(3, "Cat"); System.out.println("hashMap : " + hashMap + "\n"); /* * Returns true if this map contains a mapping for the specified key. */ boolean isKeyExist = hashMap.containsKey(1); System.out.println("isKey '1' Exist : " + isKeyExist); isKeyExist = hashMap.containsKey(10); System.out.println("isKey '10' Exist : " + isKeyExist); } }
hashMap : {1=Apple, 2=Ball, 3=Cat} isKey '1' Exist : true isKey '10' Exist : false
https://sites.google.com/site/javaee4321/java-collections/HashMapDemoContainsKey.zip?attredirects=0&d=1
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