Question

Language is in Java, please explain the answer using comments, Thank you. I always rate!!!

PLEASE DO NOT import any packages to solve the problem. PLEASE use classes and methods from java.lang.*, since they are automatically imported without import statement.

build a method called;

public static in[] multbygrp(int[] elems, int grpsize)

This method splits arr into subgroups of (equal) size groupSize, and multiply the contents of each subgroup. It returns the individual product in a new list.

If splitting can't be done properly, returns an empty array.

You can assume groupSize is greater than 0 and less than or equal to the length of arr

Input: [1, 2, -8, 2] , 2

Output: [2, -16]

Input: [1, 2, 3, 4] , 3

Output: []

Input: [5, 6, 7] , 1

Output: [5, 6, 7]

Answer 1

import java.util.*;

public class MyClass {
  
public static int[] multbygrp(int[] elems, int grpsize)
{
int size = elems.length;
if(size%grpsize!=0)
{
return new int[0];
}
  
int grparray[] = new int[size/grpsize];
int k= 0;
for(int i =0;i<size;i+=grpsize)
{
int a =1;
for(int j=i;j<i+grpsize;j++)
{
a= a*elems[j];
}
grparray[k]=a;
k++;
}
return grparray;
}
  
public static void main(String args[]) {
int A[] = {1,2,-8,2};
int grpsize = 2;
int arr[] = multbygrp(A,grpsize);
System.out.println(Arrays.toString(arr));
}
}