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Bucket sort in java

Posted on November 27, 2021November 27, 2021 By christo No Comments on Bucket sort in java

Here is the Complete programme of Bucket Sort in java

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

/**
 * Wikipedia: https://en.wikipedia.org/wiki/Bucket_sort
 */
public class BucketSort {

    public static void main(String[] args) {
        int[] arr = new int[10];

        /* generate 10 random numbers from -50 to 49 */
        Random random = new Random();
        for (int i = 0; i < arr.length; ++i) {
            arr[i] = random.nextInt(100) - 50;
        }

        bucketSort(arr);

        /* check array is sorted or not */
        for (int i = 0, limit = arr.length - 1; i < limit; ++i) {
            assert arr[i] <= arr[i + 1];
        }
    }

    /**
     * BucketSort algorithms implements
     *
     * @param arr the array contains elements
     */
    private static void bucketSort(int[] arr) {
        /* get max value of arr */
        int max = max(arr);

        /* get min value of arr */
        int min = min(arr);

        /* number of buckets */
        int numberOfBuckets = max - min + 1;

        List<List<Integer>> buckets = new ArrayList<>(numberOfBuckets);

        /* init buckets */
        for (int i = 0; i < numberOfBuckets; ++i) {
            buckets.add(new ArrayList<>());
        }

        /* store elements to buckets */
        for (int value : arr) {
            int hash = hash(value, min, numberOfBuckets);
            buckets.get(hash).add(value);
        }

        /* sort individual bucket */
        for (List<Integer> bucket : buckets) {
            Collections.sort(bucket);
        }

        /* concatenate buckets to origin array */
        int index = 0;
        for (List<Integer> bucket : buckets) {
            for (int value : bucket) {
                arr[index++] = value;
            }
        }
    }

    /**
     * Get index of bucket which of our elements gets placed into it.
     *
     * @param elem the element of array to be sorted
     * @param min min value of array
     * @param numberOfBucket the number of bucket
     * @return index of bucket
     */
    private static int hash(int elem, int min, int numberOfBucket) {
        return (elem - min) / numberOfBucket;
    }

    /**
     * Calculate max value of array
     *
     * @param arr the array contains elements
     * @return max value of given array
     */
    public static int max(int[] arr) {
        int max = arr[0];
        for (int value : arr) {
            if (value > max) {
                max = value;
            }
        }
        return max;
    }

    /**
     * Calculate min value of array
     *
     * @param arr the array contains elements
     * @return min value of given array
     */
    public static int min(int[] arr) {
        int min = arr[0];
        for (int value : arr) {
            if (value < min) {
                min = value;
            }
        }
        return min;
    }
}

java Tags:Bucket sort in java, java

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