ArraySplitter.java

/*
"isaac" asked on YA:

java method help ?

Write a method  called splitArray that will accept a single 1-D integer array and return two arrays.  The method should copy the elements from even-indexed array indices to one array and odd-valued array indices to the other array. Each array should be of the precise length of the number of elements it contains.

*/

import java.util.Arrays;

public class ArraySplitter {

    /**
      * Program:    ArraySplitter.java
      * Purpose:    Yahoo! Answers
      * Creator:    Chris Clarke
      * Created:    18-29.11.2019
      * Notes:      Function splitArray() returns a 2-D array containing two 1-D arrays.
      */

    public int[][] splitArray (int[] anArray) {
        int[][] numbers = new int[2][];
        int len = anArray.length;
        int size = len/2;
        int cOdd = 0, cEven = 0;

        numbers[1] = new int[size]; // for odd indices
        if (len%2==1) size++;
        numbers[0] = new int[size]; // for even indices

        for (int i=0; i<len; i++)
            if (i%2 == 1)   numbers[1][cOdd++] = anArray[i];
            else        numbers[0][cEven++] = anArray[i];

        return numbers;
    }//splitArray()

    public static void main (String[] args) {
        ArraySplitter splitter = new ArraySplitter();
        int[] x = { 5, 10, 1, 33, 12, 75, 3, 4, 99 };
        int[][] result = splitter .splitArray (x);
        System.out.println ("Original array: " + Arrays.toString (x));
        System.out.println ("Even indices: " + Arrays.toString (result[0]));
        System.out.println ("Odd indices: " + Arrays.toString (result[1]));
    }//main()

}//class ArraySplitter