Sort arrays of primitive types in descending order

0 votes

I got a huge array of double types. How can I sort elements in descending order?

The Java API does not support the primitive type (like double) sorrting with a comparator. First approach that I had was

double[] array = new double[1048576];    
Arrays.stream(array).boxed().sorted(Collections.reverseOrder())…

But, boxing each primitive is way too slow and creates a lot of GC pressure. Another approach that I cam up with is to sort first and then reverse it

double[] array = new double[1048576];
...
Arrays.sort(array);
// reverse the array
for (int i = 0; i < array.length / 2; i++) {
     // swap the elements
     double temp = array[i];
     array[i] = array[array.length - (i + 1)];
     array[array.length - (i + 1)] = temp;
}

This approach is also slow. What is a better way to solve this problem?

Aug 3, 2022 in Java by krishna
• 2,820 points
696 views

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