Java HashMap contains values based on the key.It inherits the AbstractMap class and implements the Map interface. Since Java 5, it is denoted as HashMap, where K stands for key and V for value. It allows us to store the null elements as well, but there should be only one null key. HashMap in Java is like the legacy Hashtable class, but it is not synchronized. HashMap class is found in the java.util package. It is easy to perform operations using the key index like updation, deletion, etc. If you try to insert the duplicate key, it will replace the element of the corresponding key. iterate over the hashmap using for-each loopįor(Map.Entry entry : prices.Java HashMap class implements the Map interface which allows us to store key and value pair, where keys should be unique. Then, you can loop over the entries using a for-each loop, as shown in the code snippet below: This method returns a set of entries, which are key-value pairs. To start iteration, you need to obtain a set of entries from the hashmap using the entrySet() method. In this section, we will guide you on how to iterate over a hashmap using a for-each loop. A for-each loop is a syntactic sugar that makes iterating over collections more readable and efficient. Iterating over a hashmap in Java can be done in several ways, but one of the simplest and most preferred ways is using a for-each loop. ![]() Iterating Over Hashmap Using a For-Each Loop Now that you have a basic understanding of hashmaps in Java and how they can be iterated, let’s move on to the different techniques you can use to iterate through them efficiently. Print out the ArrayList to display the values.Īs you can see, we were able to iterate through the values of the hashmap and store them in an ArrayList using the enhanced for loop.Retrieve and store the values in the ArrayList.Use the enhanced for loop to iterate through the key-value pairs in the hashmap.Create a new ArrayList to store the values.Here’s how we can iterate through the values of the hashmap using the enhanced for loop: Suppose we have a hashmap with the key-value pairs shown in the table above. Now, let’s look at some examples of hashmap iteration in Java. This makes them an ideal choice for applications that require fast access to information. Instead of searching through an entire dataset, which can take a lot of time and resources, hashmaps use a hashing function to locate the specific key-value pair instantly. Hashmaps are incredibly useful when it comes to storing and retrieving data quickly. Each key is unique, and it has a corresponding value that can be accessed and manipulated efficiently. In its simplest form, a hashmap is a data structure that stores information in key-value pairs. ![]()
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