How to Sort a Java ArrayList of Doubles in Descending Order?

Sorting a List or ArrayList in Java

When working with collections of data, it often becomes necessary to sort the elements in a specific order. This article presents a solution for sorting a List or ArrayList of doubles in descending order.

Problem:

Consider the following input ArrayList:

List<Double> testList = new ArrayList<>();

testList.add(0.5);
testList.add(0.2);
testList.add(0.9);
testList.add(0.1);
// ... (remaining elements)

We need to sort this ArrayList in descending order, producing the following output:

0.92
0.9
0.71
0.71
0.71
// ... (remaining elements)

Solution:

Utilizing the Java Collections framework, we can achieve this sorting in a straightforward manner:

Collections.sort(testList);
Collections.reverse(testList);

By calling Collections.sort(testList), we initiate the sorting of the ArrayList in ascending order. To reverse the order and obtain the desired descending order, we subsequently invoke Collections.reverse(testList).

Additional Information:

Remember to import the Collections class before using these methods:

import java.util.Collections;

The Collections class provides various utility methods for working with collections, making it a valuable resource for collection manipulation tasks.

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