How to do parallel sorting using Arrays.parallelSort function in Java

With the development of computer hardware, we can now use multi-core CPUs to process data more efficiently. In Java, we can use the parallelSort function in the Arrays class to perform parallel sorting to speed up the data sorting process.

First, let's take a look at how to use the Arrays.sort function for single-threaded sorting. Here is a simple example that demonstrates how to sort an array of integers:

import java.util.Arrays;

public class SingleThreadSortExample {
    public static void main(String[] args) {
        int[] numbers = { 5, 3, 6, 1, 9, 4 };
        Arrays.sort(numbers); // 使用 Arrays.sort 函数进行排序
        for (int num : numbers) {
            System.out.print(num + " ");
        }
    }
}

The output is: 1 3 4 5 6 9

In this example, We used the Arrays.sort function to sort an array of integers. This is a single-threaded call that does all the sorting work in one thread.

However, using the parallelSort function, we can divide the sorting process into multiple threads for parallel execution. This will greatly improve sorting efficiency. The following is sample code for parallel sorting using the Arrays.parallelSort function:

import java.util.Arrays;

public class ParallelSortExample {
    public static void main(String[] args) {
        int[] numbers = { 5, 3, 6, 1, 9, 4 };
        Arrays.parallelSort(numbers); // 使用 Arrays.parallelSort 函数进行排序
        for (int num : numbers) {
            System.out.print(num + " ");
        }
    }
}

The output result is the same as single-threaded sorting: 1 3 4 5 6 9. However, on devices with multi-core CPUs, the parallelSort function will be faster than single-threaded sorting. This example is just a simple demonstration. In fact, the larger the amount of data, the greater the advantage of using parallelSort for parallel sorting.

If you need to sort the object array, you can also use the parallelSort function, but you need to specify a custom Comparator for sorting. The following is an example of parallel sorting of an array of strings:

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

public class ParallelSortWithComparatorExample {
    public static void main(String[] args) {
        String[] words = { "banana", "apple", "pear", "orange" };
        Arrays.parallelSort(words, new Comparator<String>() {
            public int compare(String s1, String s2) {
                return s1.compareTo(s2);
            }
        });
        for (String word : words) {
            System.out.print(word + " ");
        }
    }
}

The output is: apple banana orange pear

In this example, we use Arrays. The parallelSort method sorts an array of strings. Unlike single-threaded sorting, we need to pass a custom Comparator to the sorting function to specify the sorting rules. In this example, we use an anonymous inner class to create a custom Comparator that sorts elements alphabetically.

It can be seen that using the parallelSort function can help you sort the data faster. However, it is worth noting that single-threaded sorting may be faster with small data volumes. Therefore, when using the parallelSort function, you need to choose the sorting method that best suits you according to the actual situation.

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