Java program for recursively reversing an array

Question

I am supposed to be writing a program to reverse the numbers in an array recursively. I don't really know much code at this point. This is what I have so far.

This is the reverse method itself:

  public static void reverse(int[] array, int i, int j)
  {
    if (i < j)
    {
      int temp = array[i];
      array[i] = array[j];
      array[j] = temp;
      reverse(array, ++i, --j);

I am not sure if this is even right. I then have the main method.

  public static void main(String[] args)
  {
   Scanner input = new Scanner(System.in);
   System.out.println("Enter size of the array");
   int n = input.nextInt();
   int[] array = new int[n];

   for (int i =0; i <array.length; i++)
   {
     System.out.println("Enter number to be inputed into array.");
     array[i] = input.nextInt();

   }
    System.out.println(array);
  }

It is not printing out right and prints numbers and letter in text where I think it should be the array.

Your code is incomplete, could post the whole reverse method? — Valentin Ruano
– Valentin Ruano, Commented Nov 5, 2013 at 23:18
That is my code. It is just missing braces like ajb said. It still isn't working though. I can't call my method correctly. — user2958370
– user2958370, Commented Nov 5, 2013 at 23:35

nhgrif · Accepted Answer · 2013-11-05 23:16:18Z

2

Change System.out.println(array); to this:

System.out.println(Arrays.toString(array));

Then you can see whether or not your method is properly reversing. Currently, you're not printing the contents of the array, just the memory address where your array resides.

answered Nov 5, 2013 at 23:16

nhgrif

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3 Comments

user2958370 Over a year ago

What is a String? Excuse my probably stupid question.

nhgrif Over a year ago

String is a data type which essentially represents an array of chars. This probably isn't technically write, but a String is a data type that holds words, phrases, etc., in much the same way int is a data type which holds integers.

Valentin Ruano Over a year ago

A ummutable sequence of characters.

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