How to swap the two numbers in string in specific way?

Question

Hi I want to swap the numbers in string form in specific way.

For example :

If i have 10325476 then it should return 01234567 whatever i had tried so far is i just swapped the the pair of two numbers in String.

EDIT
if i have 01AB3423 then Answer should be 10BA4332 Following is my current implementation which gives me desired output.

char temp1 = c1[0];
c1[0] = c1[1];
c1[1] = temp1;

char temp2=c1[2];
c1[2]=c1[3];
c1[3]=temp2;

char temp3=c1[4];
c1[4]=c1[5];
c1[5]=temp3;

char temp4=c1[6];
c1[6]=c1[7];
c1[7]=temp4;

I have done this for all 8 numbers but its a static way. And i know its not a correct way to do this.I want to do this dynamically as well.is there any other way to implement this?

Any idea and advice will be appreciated.

It is still not clear. You want to swap each pair? Or sort no matter what order the digits are in? — Simon, Dec 02 '12 at 15:11
@Simon. Well, you are right. Just saw the example again, and saw that swapping each pair, and sorting would give same result. juned, cna you specify clearly do you actually want to sort, or swap every pair of numbers sequentially? — Rohit Jain, Dec 02 '12 at 15:20

Rohit Jain · Accepted Answer · 2012-12-02T18:02:24.020

3

Edit: -

From your latest edit, it seems like you want to swap consecutive pairs of characters in your string. You would need a loop in that case.

Try this code: -

String str = "BA34CD567";
char[] arr = str.toCharArray();

for (int i = 0; i < arr.length - 1; i += 2) {
    char temp = arr[i];
    arr[i] = arr[i + 1];
    arr[i + 1] = temp;
}

System.out.println(arr);

Output : -

AB43DC657

I have incremented i by 2 in the loop, because you are considering two elements on each iteration.

Old Answer : -

Just 3 steps: -

Convert your string to char array. (str.toCharArray())
Sort your char array. (Arrays.sort(arr)). Remember, Arrays.sort does not return the sorted array. It sorts the array in place.
And then print your array. (Well, you know how to do this)

edited Dec 02 '12 at 18:02

answered Dec 02 '12 at 15:02

Rohit Jain

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Thanks for response,i didn't get this line `Arrays.sort does not return the sorted array. It sorts the array in place` can explain it in detail? – Juned Dec 02 '12 at 15:10
@RohitJain You beat me to it! Nice answer without exactly coding it for them. – xagyg Dec 02 '12 at 15:10
@juned.. When you do `Arrays.sort` you don't need to store it the result in an array. It will aumatically sort your array. Just print it after you used `Array.sort`. – Rohit Jain Dec 02 '12 at 15:13
@juned.. xagyg has given an implementation for the algorithm I posted. Now you have both. You can understand it easily now. – Rohit Jain Dec 02 '12 at 15:16
@juned. So, you really wanted to sort and not swap every number pair. What output do you want for - `4352678`? – Rohit Jain Dec 02 '12 at 15:21
HI @RohitJain i have some problem with this its doesn't give the desired output, if i have `BABABABA` then it should return `ABABABAB` but with this it returns `AAAABBBB` for `4352678` it should give `34257608` – Juned Dec 02 '12 at 17:38
@juned.. That is why I asked for clarificatin that you want sorting or swapping. See my last comment in this question. – Rohit Jain Dec 02 '12 at 17:57
@RohitJain yeah my mistake, now it seems absolutely correct. Thanks Again – Juned Dec 02 '12 at 18:07
@RohitJain i need you some help in this question http://stackoverflow.com/questions/13721637/method-to-pass-a-only-two-element-of-byte-array – Juned Dec 05 '12 at 11:02

score 0 · Answer 2 · answered Dec 02 '12 at 15:02

0

Take a look at some sorting algorithms, such as bubble sort (if it is a small set of numbers), merge sort, quicksort, and others. This is what you seem to want to do -- sorting.

answered Dec 02 '12 at 15:02

Victor Zamanian

3,100
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How to swap the two numbers in string in specific way?

2 Answers2