Web Reference: Accepts a function that extracts a long sort key from a type T, and returns a Comparator that compares by that sort key. The returned comparator is serializable if the specified function is also serializable. Jul 23, 2025 · To sort an array using the comparator first we convert the array into the list, call the sort method on the list and pass an instance of the comparator as an argument. It is easier to use the Comparable interface when possible, but the Comparator interface is more powerful because it allows you to sort any kind of object even if you cannot change its code.
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