Java Array Sort descending?

To sort an array in descending order in Java, you can use the Arrays.sort method and pass it a comparator that compares the elements in reverse order. Here's an example of how to sort an array of integers in descending order:

---

import java.util.Arrays;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        Integer[] arr = {3, 1, 2, 5, 4};
        Arrays.sort(arr, Comparator.reverseOrder());
        System.out.println(Arrays.toString(arr));  // [5, 4, 3, 2, 1]
    }
}

---

You can use this same approach to sort an array of any object type that implements the Comparable interface. Note that Arrays.sort with a Comparator does not work with primitive arrays (like int[] or double[]). For example, to sort an array of strings in descending order:

---

import java.util.Arrays;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        String[] arr = {"apple", "banana", "cherry"};
        Arrays.sort(arr, Comparator.reverseOrder());
        System.out.println(Arrays.toString(arr));  // [cherry, banana, apple]
    }
}

---

Alternatively, you can use the Collections.reverseOrder method to create a comparator that compares elements in reverse order, and pass it to the Arrays.sort method:

---

import java.util.Arrays;
import java.util.Collections;

public class Main {
    public static void main(String[] args) {
        Integer[] arr = {3, 1, 2, 5, 4};
        Arrays.sort(arr, Collections.reverseOrder());
        System.out.println(Arrays.toString(arr));  // [5, 4, 3, 2, 1]
    }
}

---

If you need to sort a primitive array (e.g., int[]) in descending order, you can convert it to a stream, sort it, and convert it back:

---

import java.util.Arrays;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        int[] arr = {3, 1, 2, 5, 4};
        arr = Arrays.stream(arr)
                    .boxed()
                    .sorted(Comparator.reverseOrder())
                    .mapToInt(Integer::intValue)
                    .toArray();
        System.out.println(Arrays.toString(arr));  // [5, 4, 3, 2, 1]
    }
}

Either way, this will sort the array in descending order.