Java Hashmap – containsKey(Object key) and containsValue(Object value) – Check if Key/Value Exists in Map

There are few concepts and technologies which comes by default with each and every programing language and Collection is one of them. Java Collection is a very big field. It comes with so many interfaces and operations.

In this tutorial we will go over Hashmap and two of it’s operation boolean containsKey(Object key) and boolean containsValue(Object value).

Let’s look at below Java code

package com.crunchify.tutorials; import