bucket sort java

/**
 * @author lautturi.com
 * Java example: bucket sort in java
 */

import java.util.*;
import java.time.*;

public class Lautturi {

	static int maxValue(int[] arr) {
		int max_value = 0;
		for (int i = 0; i < arr.length; i++)
			if (arr[i] > max_value)
				max_value = arr[i];
		return max_value;
	}

	public static int[] bucket_sort(int[] arr, int max_value) {
		int[] bucket = new int[max_value + 1];
		int[] sorted_arr = new int[arr.length];

		for (int i = 0; i < arr.length; i++)
			bucket[arr[i]]++;

		int pos = 0;
		for (int i = 0; i < bucket.length; i++)
			for (int j = 0; j < bucket[i]; j++)
				sorted_arr[pos++] = i;

		return sorted_arr;
	}

	public static void main(String[] args) {
		int[] arr = { 1, 4, 2, 7, 5, 16, 12, 8, 13, 28 };
		int max_value = maxValue(arr);

		System.out.print("\nOrlautturinal : ");
		System.out.println(Arrays.toString(arr));

		System.out.print("\nBucket Sorted : ");
		System.out.println(Arrays.toString(bucket_sort(arr, max_value)));
	}
}

output:

Orlautturinal : [1, 4, 2, 7, 5, 16, 12, 8, 13, 28]

Bucket Sorted : [1, 2, 4, 5, 7, 8, 12, 13, 16, 28]