Solution: Merge a Number of Sorted Arrays

class Merge {
 public static int n = 4;

 public static ArrayList < Integer > mergeSortedArrays(int[][] arr, ArrayList < Integer > Output) {
  //traversing the 2-D array and appending all arrays into an ArrayList
  for (int i = 0; i < arr.length; i++) {
   for (int j = 0; j < arr[i].length; j++) {
    //adding into the ArrayList
    Output.add(arr[i][j]);
   }
  }
  //sorting the ArryList using the inbuilt sort function
  Collections.sort(Output);
  return Output;
 }

 public static void main(String args[]) {
  // 2D input array 
  int[][] arr = {{16, 25, 36}, {2, 9, 15}, {22, 55, 67}, {79, 38, 99}}; 
  ArrayList < Integer > Output = new ArrayList < Integer > ();

  System.out.print(mergeSortedArrays(arr, Output));

 }
}