how to replace the null character

Question

In java ,i have editfield whcih takes its input ,in it we can enter 3 digits

when i enter first and third ,leaving 2 digit empty ,how to remove empty digit thanks

Answer 1

If you've got "X_Y" ("_" indicating a missing character) and you want "XY", then

String newString = entered.charAt(0) + entered.charAt(2)

is the simplest way. But that's only useful for this one particular case. Do you not want to handle missing beginning and end characters too ?

Answer 2

If you want to remove all white space internally in a String (which is what I think you're asking), then you want something like:

sText.replaceAll("\\s+", "")

Hope that helps.

Answer 3

Stripping spaces from a String (don't know if J2ME has StringBuilder so I'll just do ugly String concatenation):

String noSpaces = "";
for (int i=0; i<perhapsSpaces.length(); i++)
{
  if (perhapsSpaces.charAt(i) != ' ')
    noSpaces += perhapsSpaces.charAt(i);
}

For "better" space handling, perhaps Character.isWhitespace?