How to Sort Java Arrays in Descending Order?

Sort Java Arrays in Descending Order

Sorting arrays in descending order is not directly supported by the Arrays class. However, there are methods available to achieve this.

Sorting Objects in Descending Order

If your array contains objects, you can use the sort() method with a comparator that reverses the sorting order:

<code class="java">Arrays.sort(a, Collections.reverseOrder());</code>

This will sort the array in descending order based on the natural ordering of the objects.

Sorting Primitive Arrays in Descending Order

For primitive arrays, you need to follow a two-step process:

1. Sort in Ascending Order: First, sort the array in ascending order using Arrays.sort().
2. Reverse the Array: After sorting in ascending order, reverse the array to obtain descending order. You can use Collections.reverse() or the reverse() method provided by Java for newer versions.

Example for int Array:

<code class="java">int[] arr = {5, 2, 8, 1, 3};

// Sort in ascending order
Arrays.sort(arr);

// Reverse the array
Collections.reverse(Arrays.asList(arr));

// Array is now sorted in descending order</code>

Alternative Methods:

• Using the Arrays.sort() method with a custom comparator that implements the Comparator interface and reverses the ordering.
• Using streams and the sorted() method with a custom comparator, similar to the object sorting approach.

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