Insertion order is not maintained in a HashMap. Note: We'll use the same example throughout the article so that it gets easier to perceive the variations. We also refer to these key-value pairs as elements of the HashMap. For instance, String -> Integer, Integer -Integer, etc. The important part is that HashMap lets you create a key object of one type which will be mapped to a value object of the same or another type. HashMap stores a group of key-value pairs and has been introduced in Java 1.2. In order to help you out, let me tell you that HashMap would be used in this case. ![]() What if he could have a computer system to find out this number just by putting a prisoner’s name? Well, you do have the facility, so can you write a Java program to store all the names with their corresponding cell numbers? ![]() Warden Norton has to reach Andy's cell immediately but he doesn't remember the number of his cell. The guards called his name repeatedly and went up to the cell only to find themself baffled because Andy had escaped in spite of the security. However, a prisoner was missing and they actually knew who he was: Andy Dufresne. It was the usual day at the Shawshank State Prison in 1966 when the prisoners appeared out of their cells for the roll call. However, prior knowledge will be more helpful. A brief explanation of lambda expressions, cursors and Stream API has also been provided.The article mainly focuses on the methods to iterate HashMap in Java.The methods to modify HashMap have also been described. This article discusses the implementation of HashMap.We have discussed six different ways in this article. There are several methods to iterate a HashMap in Java. Alternatively, you can choose to fetch the set of only values or the set of all key-value pairs. HashMap implements the Map interface and enables the storage of data in the form of key-value pairs that can be fetched by using a key to get the corresponding value.
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