CODEWITHSUNDEEP
javaformatter
OscarRyz
OscarRyz

Reputation: 199225

Fill strings with 0's using formatter

I know I can fill with spaces using : 

String.format("%6s", "abc"); // ___abc ( three spaces before abc

But I can't seem to find how to produce: 

000abc

Edit:

I tried %06s prior to asking this. Just letting you know before more ( untried ) answers show up.

Currently I have: String.format("%6s", data ).replace(' ', '0' ) But I think there must exists a better way.

Upvotes: 6

Views: 3182

Answers (5)

Ed Staub
Ed Staub

Reputation: 15690

By all means, find a library you like for this kind of stuff and learn what's in your shiny new toolbox so you reinvent fewer wheels (that sometimes have flats). I prefer Guava to Apache Commons. In this case they are equivalent: 

Strings.padStart("abc",6,'0');

Upvotes: 1

mre
mre

Reputation: 44240

Try rolling your own static-utility method

public static String leftPadStringWithChar(String s, int fixedLength, char c){

    if(fixedLength < s.length()){
        throw new IllegalArgumentException();
    }

    StringBuilder sb = new StringBuilder(s);

    for(int i = 0; i < fixedLength - s.length(); i++){
        sb.insert(0, c);
    }

    return sb.toString();
}

And then use it, as such

System.out.println(leftPadStringWithChar("abc", 6, '0'));

OUTPUT

000abc

Upvotes: 1

leonbloy
leonbloy

Reputation: 75906

Quick and dirty (set the length of the "000....00" string as the maximum len you support) :

public static String lefTpadWithZeros(String x,int minlen) {
   return x.length()<minlen ? 
       "000000000000000".substring(0,minlen-x.length()) + x : x;     
}

Upvotes: 0

Bananeweizen
Bananeweizen

Reputation: 22070

You should really consider using StringUtils from Apache Commons Lang for such String manipulation tasks as your code will get much more readable. Your example would be StringUtils.leftPad("abc", 6, ' ');

Upvotes: 7

King Skippus
King Skippus

Reputation: 3826

I think this is what you're looking for.

String.format("%06s", "abc");

Upvotes: -1

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