94 Map In Java VcXYlkICcQU - Complete Information & Details

Web Reference: Keys are unique but values can be repeated. The value of a key can also be updated. In a map, keys are in a set while values are in a list. We can get all the keys by using the method keySet (). The Map interface provides three collection views, which allow a map's contents to be viewed as a set of keys, collection of values, or set of key-value mappings. Common classes that implement Map: Tip: Use a Map when you want to associate values with unique keys, like storing user IDs with names. Duplicates allowed? Stores key-value pairs? Maintains order? Next, we'll look at how to use HashMap to store items in key/value pairs.

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