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javaarrays
Fireship
Fireship

Reputation: 47

Change values between two arrays

I have an array of 4 ints, and I need to replace them with values of another array. For example: I have an array {5,3,7,2}, and I need to replace the values and get array {2,7,3,5}.

Here's my code:

public static void main(String args[]){
    int array[] = new int[4];
    array[0] = 1;
    array[1] = 4;
    array[2] = 3;
    array[3] = 7;
    int swapArray[] = new int[5];

    for (int j = 3; j > 0; j--) {
        for (int i = 0; i < 4; i++) {
            swapArray[j] = array[i];
            System.out.print(" " + swapArray[j]);
        }
    }
}

But it doesn't change values, just repeats it 3 times.

Upvotes: 1

Views: 678

Answers (3)

Shiladittya Chakraborty
Shiladittya Chakraborty

Reputation: 4418

If you want reverse an array :

With Commons.Lang, you could simply use

int array[] = new int[4];
array[0] = 1;
array[1] = 4;
array[2] = 3;
array[3] = 7;

ArrayUtils.reverse(array);
// For print output
System.out.println(Arrays.toString(array));
// Print output [7, 3, 4, 1]

Upvotes: 0

Fariz Aghayev
Fariz Aghayev

Reputation: 651

Maybe like this : 

  public static void main(String args[]){
    int array[] = {1,4,3,7};
    int swapArray[] = new int[array.length];
    for(int i=0;i<array.length;i++)
         swapArray[i]=array[array.length-1];
         System.out.print(" " + swapArray[i]);
        }
    }

Upvotes: 3

Elliott Frisch
Elliott Frisch

Reputation: 201537

It appears that you want to reverse the array. You could do it in place like,

int[] arr = { 5, 3, 7, 2 };
System.out.println(Arrays.toString(arr));
for (int i = 0; i < arr.length / 2; i++) {
  int t = arr[i];
  arr[i] = arr[arr.length - i - 1];
  arr[arr.length - i - 1] = t;
}
System.out.println(Arrays.toString(arr));

Or, you could copy it to a new (reversed) array like,

int[] arr = { 5, 3, 7, 2 };
System.out.println(Arrays.toString(arr));
int[] arr2 = new int[arr.length];
for (int i = 0; i < arr.length; i++) {
  arr2[arr2.length - i - 1] = arr[i];
}
System.out.println(Arrays.toString(arr2));

Both examples output (the requested)

[5, 3, 7, 2]
[2, 7, 3, 5]

Upvotes: 2

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