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Merge Sort Recursive in java

Posted on November 27, 2021November 27, 2021 By christo No Comments on Merge Sort Recursive in java

Complete programme of Merge Sort Recursive in java

import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;

public class MergeSortRecursive {

    List<Integer> arr;

    public MergeSortRecursive(List<Integer> arr) {
        this.arr = arr;
    }

    public void mergeSort() {
        List<Integer> arrSorted = merge(arr);
        System.out.println(arrSorted);
    }

    private static List<Integer> merge(List<Integer> arr) {

        // base condition
        if (arr.size() <= 1) {
            return arr;
        }

        int arrLength = arr.size();
        int half = arrLength / 2;
        List<Integer> arrA = arr.subList(0, half);
        List<Integer> arrB = arr.subList(half, arr.size());

        // recursion
        arrA = merge(arrA);
        arrB = merge(arrB);

        return sort(arrA, arrB);
    }

    private static List<Integer> sort(List<Integer> unsortedA, List<Integer> unsortedB) {
        if (unsortedA.size() <= 0 && unsortedB.size() <= 0) {
            return new ArrayList<>();
        }
        if (unsortedA.size() <= 0) {
            return unsortedB;
        }
        if (unsortedB.size() <= 0) {
            return unsortedA;
        }
        if (unsortedA.get(0) <= unsortedB.get(0)) {
            List<Integer> newAl = new ArrayList<Integer>() {
                {
                    add(unsortedA.get(0));
                }
            };
            newAl.addAll(sort(unsortedA.subList(1, unsortedA.size()), unsortedB));
            return newAl;
        } else {
            List<Integer> newAl = new ArrayList<Integer>() {
                {
                    add(unsortedB.get(0));
                }
            };
            newAl.addAll(sort(unsortedA, unsortedB.subList(1, unsortedB.size())));
            return newAl;
        }
    }

}

class App {

    public static void main(String[] args) {
        MergeSortRecursive sort = new MergeSortRecursive(new ArrayList<>(Arrays.asList(4, 3, 1, 8, 5, 10, 0, 1, 4, 11, 8, 9)));
        sort.mergeSort();
    }
}

java Tags:java, Merge Sort Recursive in java

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