Web Reference: You can't have an hash map with multiple keys, but you can have an object that takes multiple parameters as the key. Create an object called Index that takes an x and y value. Mar 13, 2024 · In this quick tutorial, we discuss the highly useful programming concept known as a Pair. Pairs provide a convenient way of handling simple key-to-value association and are particularly useful when we want to return two values from a method. It is part of the java.util package and implements the Map interface. Instead of accessing elements by an index (like with ArrayList), you use a key to retrieve its associated value.
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