![]() Look at the code below to see how to use the remove method on a hashmap. It accepts the target key and uses that to identify which pair to remove. The remove() method looks similar to the above method. There may be a case where a specific key-value pair may need to be changed or removed entirely - you can use the remove() method to solve this problem since it does precisely that. One more important thing to consider is the need to remove a pair from the hashmap. In this example, it returns the string, John. The line of code above looks for the key named First Name and returns the associated value. ![]() Let’s look at the syntax for that next - spoiler alert it's as simple as you think. With the get method, you can easily retrieve the value of a key simply by targeting the key. Knowing how to retrieve that data for use is something that the get() method solves quickly. This hashmap could store additional user information like Last Name and Smith, allowing you to build a very organized set of data about a user. This simple line of code quickly adds a key-value pair with the strings First Name and John to the userData hashmap. The syntax for adding a pair with the put() method can be seen in the code snippet below. The put() method adds items to your hashmap, and with it, you can easily add new pairs as you need to. ![]() Let’s go over the three most common methods, then briefly discuss the others.Ĭheck out this video on how to use the put() and get() methods before seeing some code examples. There are several methods available, each serving a unique and helpful function. You can interact with Hashmaps through a variety of methods three of the most commonly used methods are the put, get, and remove methods. Now let’s look at the syntax for working with Java hashmap methods. The pairing of values with a user-friendly key such as a user's name with the words First Name makes building a UI much simpler. This structure is typical, especially when working with building user interfaces. The code above creates a Java hashmap named userData this hashmap can accept a key with a string type and a value with a string type. To use the hashmap, you will need to import it from the library as seen below. ![]() By pairing data like this, you can easily target and retrieve data, such as all usernames or even usernames that start with X. How Java Hashmap WorksĪ hashmap can hold multiple key-value pairs within it these pairs use sensible data patterns like: (“First Name”, “Johnathan”). Now that we covered what it is, let’s look deeper at its behavior and inner workings by examining the syntactic structure. Additionally, hashmap keys and values support many data types such as strings, integers, booleans, characters, and doubles. Storing data in key-value pairs makes many programming tasks more manageable, from data management to creating pleasant user interfaces. ![]()
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