Merge two integer arrays by summing their values one by one into one array

Question

I've seen similar questions and none provide the answer that I'm looking for, so I apologize in advance if this is considered a duplicate. I'm trying to combine arrays {2, null, 3} and {4, 5, 6} into {6, 5, 9}. Sorry if the question is stupid.

Answer 1

You can simply do a for loop:

int[] newArray = new int[array1.length]();
for(int i = 0; i < array1.length; i ++){
  int sum = (array1[i] == null ? 0 : array1[i]) + (array2[i] == null ? 0 : array2[i]);
  newArray[i] = sum;
}

You should consider the two array might not be of the same size

int size1 = array1.length;
int size2 = array2.length;
int[] newArray = new int[size1 > size2 ? size1 : size2];


for(int i = 0; i < newArray.length; i ++){
  int sum = 0;
  if(size1 >= i && size2 >= i){
    sum = (array1[i] == null ? 0 : array1[i]) + (array2[i] == null ? 0 : array2[i]);
  } else if(size1 >= i && size2 < i){
    sum = array1[i] == null ? 0 : array1[i];
  } else{
    sum = array2[i] == null ? 0 : array2[i];
  }
  newArray[i] = sum;
}

Note: I did it as you asked, but int is always != null, the default value is 0

I wrote it by hand so it might be not perfect, hope this helped

Answer 2

You can do something like this

public Integer[] arraySum(Integer[] array1, Integer[] array2) {
    if (array1.length != array2.length) {
        throw new IllegalArgumentException("Arrays should have the same size.");
    }
    Integer[] result = new Integer[array1.length];
    for (int i = 0; i < array1.length; i++) {
        result[i] = getValue(array1[i]) + getValue(array2[i]);
    }
    return result;
}

private int getValue(Integer integer) {
    return integer == null ? 0 : integer;
}

Answer 3

Maybe you mainly need:

a3[i] = (a1[i] == null ? a1[i] : 0) + (a2[i] == null ? a2[i] : 0);

Answer 4

private static String[] arrayMeger(String[] arr1,String[] arr2 ){
String[] returnArr = new String[arr1.length()];
for(int i=0;i<arr.length();i++)
{
   int valInt = (arr[i]==null) ? 0 : Integer.parse(arr[i]);
int valInt2 = (arr2[i]==null) ? 0 : Integer.parse(arr2[i]);
returnArr [i] = Integer.toString(valInt +valInt2 );
}
return returnArr ;
}

Answer 5

array is very old concept you should have a look at Array List

For know in your case i consider two static array with 3 element in it

int[] A = {2, null, 3};
int[] B = {4, 5, 6} ;
int[] C= new  int[3]

for(int i=0;i<3;i++){
C[i] = (A[i]==null?A[i]:0) + (B[i]==null?B[i]:0);
}
//C array is your final array but make sure you remove null from your code

Answer 6

I think you may need this, Try these lines of code, they may help

    int[] a = {2, null,3};
    int[] b = {4, 5,6};
    int c[a.length()];
    for(int i = 0;i < 3;i++){
       c[i] = (a[i]==null?a[i]:0) + (b[i]==null?b[i]:0)
    }