Web Reference: Jul 23, 2025 · Using Comparator we can sort ArrayList on the basis of multiple variables. We can simply implement Comparator without affecting the original User-defined class. To sort an ArrayList using Comparator we need to override the compare () method provided by comparator interface. 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. Mar 31, 2018 · Since you want to sort the integers by descending order, you first create a comparator that does that, and then chain it together multiple times to create the comparator for the list:
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