Java Challenge - Flatten an Array

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public static int flattenArray(int input) {
int flatLength = 0;
for (int i = 0; i < input.length; i++) {
flatLength += input[i].length;
}
int array = new int[flatLength];
int index = 0;
for (int i = 0; i < input.length; i++) {
for (int j = 0; j < input[i].length; j++) {
array[index++] = input[i][j];
}
}
return array;
}

import java.lang .*;
public class FlattenArray {
public static void main(String args) {
int arr = new int{{1, 2}, {3, 4, 5}};
int answer = flattenArray(arr);
for(int i = 0; i < answer.length; i++) {
System.out.println(answer[i]);
}
}

public static int flattenArray(int input) {
// Write your code here
int size = 0;

for(int i = 0; i < input.length; i++)
{
  for(int j = 0; j < input[i].length; j++)
  {
    size++;
  }
}

int[] array = new int[size];
int count = 0;
for(int i = 0; i < input.length; i++)
{
  for(int j = 0; j < input[i].length; j++)
  {
    array[count] = input[i][j];
    count++;
  }
}

return array;

}
}