Help with int Conversion to String

[Abiodun Adisa]

I have an int that i would want to convert to String if the integer is less than 4 digit it should append zeros to fill in the missing digits for example

int input=9
the function convertToString(input) should return 0009

int input=19
the function convertToString(input) should return 0019


int input=119
the function convertToString(input) should return 0119


int input=1119
the function convertToString(input) should return 1119

[Adam Schaible]

Where are you getting stuck?

This may not be the most efficient psuedo-code, but here's an approach

[code]
change int to String
add "000" in front of string
get a substring of string.length-4 - string.length
[code]

In the two minutes of thinking about it, this is the simplest approach I could come up with. There are several other ways - looping, and conditionals come to mind, but I think we'd all like to avoid control structures when possible.

[David Irwin]

You might try something like the following:

    
Integer value = new Integer(5);
 
String str = Integer.valueOf(value);
 
if(str.length() == 1)
  str = "000" + str;
else if(str.length() == 2)
  str = "00" + str;
else if(str.length() == 3)
  str = "0" + str;

It's certainly not optimal given the string concatenation and there's probably some parameter checking you'd want to add but I believe it does what you're looking for.

Dave

[Abiodun Adisa]

Thanks folks i was able to do it using

int g=1412;
String result=String.valueOf(g);
while (result.length()<4){
result="0"+result;
}

[Jesper de Jong]

Another solution:

String result = String.format("%04d", g);

And one more, for if you're using a Java version older than 5.0:

String result = new DecimalFormat("0000").format(g);

[ November 14, 2007: Message edited by: Jesper Young ]

[Adam Schaible]

Jesper's solution is the one I was looking for - it's definately the best way to do it.