show 0 as prefix if value is less than 9

Question

Still i am getting file name like below:

B-13-4-006.jpg

and

B-5-7-008.jpg

but now i want to show 0 as prefix if value less than < 9 else as it is, in short want to show values in double figures, see my code below using to file name

               "B-" + // prefix
                LoginActivity.strEventID + "-" + // eventID 
                LoginActivity.strOperativeID + "-" + // operativeID 
                getNextNumber() + // counter 
                ".jpg"

but i require, files name should look like below:

B-13-04-006.jpg

and

B-05-07-008.jpg

That's an overkill. Why don't you use the string padding? See [http://stackoverflow.com/a/4469748/2649012](http://stackoverflow.com/a/4469748/2649012) — Phantômaxx, Mar 28 '14 at 12:31
Use `String.valueOf(value)` instead of `Integer.toString(value)` — Ceiling Gecko, Mar 28 '14 at 12:31

Pankaj Kumar · Answer 1 · 2014-03-28T12:41:08.523

14

Use String.format("%02d", yournumber); to show 0 with a number if less than 10 (for two digits number).

Use method like

private String getPaddedNumber(int number) {
    return String.format("%02d", number);
}

You can read Formatter documents for more details.

How to use into your code

"B-" + // prefix
        getPaddedNumber(LoginActivity.strEventID) + "-" + // eventID 
        getPaddedNumber(LoginActivity.strOperativeID) + "-" + // operativeID 
        getPaddedNumber(getNextNumber()) + // counter 
        ".jpg"

edited Mar 28 '14 at 12:41

answered Mar 28 '14 at 12:34

Pankaj Kumar

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pankaj not getting how to use this in my existing code – Sun Mar 28 '14 at 12:39
Pass your IDs to his method, that's how. – peter.petrov Mar 28 '14 at 12:40
getting same issue, like when i tried your code my self into my code: The method getPaddedNumber(int) in the type CameraLauncherActivity is not applicable for the arguments (String) – Sun Mar 28 '14 at 12:45
What is the type of `LoginActivity.strEventID` and other 2 variables? Are they string – Pankaj Kumar Mar 28 '14 at 12:55
If they then you can parse them into integer. – Pankaj Kumar Mar 28 '14 at 13:03

score 3 · Accepted Answer · edited May 23 '17 at 11:52

As you seem to have strings that need to be (optionally) padded with zeros, you can use a different approach than generally used to pad integers:

public String addPadding(int length, String text) {
    StringBuilder sb = new StringBuilder();

    // First, add (length - 'length of text') number of '0'
    for (int i = length - text.length(); i > 0; i--) {
        sb.append('0');
    }

    // Next, add string itself
    sb.append(text);
    return sb.toString();
}

so you can use:

"B-" + // prefix
    addPadding(2, LoginActivity.strEventID) + "-" + // eventID 
    addPadding(2, LoginActivity.strOperativeID) + "-" + // operativeID 
    getNextNumber() + // counter 
    ".jpg"

There are lots of other possibilities to pad a String, see this question for more details/possibilities.

score 1 · Answer 3 · answered Mar 28 '14 at 12:35

1

public static String convert(int n){
    return n < 10 ? "0" + n : "" + n;
}

answered Mar 28 '14 at 12:35

peter.petrov

34,474
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Pankaj Kumar's approach is better though. – peter.petrov Mar 28 '14 at 12:36

score 0 · Answer 4 · answered Mar 28 '14 at 12:37

0

http://openbook.galileocomputing.de/javainsel/javainsel_04_011.html#dodtp6223d54a-d5d8-4ea7-a487-03f519d21c6b

Just use a formatter. I think this is the easiest and most accurate approach

answered Mar 28 '14 at 12:37

PKlumpp

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show 0 as prefix if value is less than 9

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