![]() ![]() It takes in two parameters - the key and the value of the item being added. To add items to a HashMap, we make use of the put() method. You'll learn how to add, access, remove, and update items in a HashMap. In this section, we'll talk about some of the useful methods that you can use when working with HashMaps. When working with HashMaps, we make use of wrapper classes. This is how HashMaps work.īefore we dive into examples, here's a list of wrapper classes and their corresponding primitive data types in Java: Wrapper Classes and Primitive Types in Java Wrapper classes You'll notice that we're working with wrapper classes and not primitive types when specifying the data types for the keys and values. The keys that will be stored in the HashMap will all be integers while the values will be strings. In the code above, we created a HashMap called StudentInfo. Here's an example to simplify the terms: HashMap StudentInfo = new HashMap() HashMapName denotes the name of the HashMap.ValueDataType denotes the data type of all the values that'll be stored in the HashMap.KeyDataType denotes the data type of all the keys that'll be stored in the HashMap.Let's explain some of the key terms in the syntax above. Here's what the syntax looks like for creating a new HashMap: HashMap HashMapName = new HashMap() ![]() In order to create and use a HashMap, you must first import the package. Data types are specified using wrapper classes instead of primitive data types.In a case where there are duplicate keys, the last one will override the other(s). ![]()
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