Remove the last chars of the Java String variable

Question

A java String variable whose value is  String path    http   cdn gs com new downloads Q22010MVR PressRelease pdf null    I want to remove the last four characters i e    null  Which method I can use in order to split

User · Answer

path   path substring 0  path length   - 5

User · Answer

I think you want to remove the last five characters        n    u    l    l     path   path substring 0  path length   - 5     Note how you need to use the return value - strings are immutable  so substring  and other methods  don t change the existing string - they return a reference to a new string with the appropriate data   Or to be a bit safer   if  path endsWith   null        path   path substring 0  path length   - 5       However  I would try to tackle the problem higher up  My guess is that you ve only got the   null  because some other code is doing something like this   path   name         extension    where extension is null  I would conditionalise that instead  so you never get the bad data in the first place    As noted in a question comment  you really should look through the String API  It s one of the most commonly-used classes in Java  so there s no excuse for not being familiar with it

User · Answer

If you like to remove last 5 characters  you can use   path substring 0 path length   - 5      could contain off by one error        If you like to remove some variable string   path substring 0 path lastIndexOf  yoursubstringtoremove       could also contain off by one error

User · Answer

Another way   if  s size  gt  5  s reverse substring 5  reverse   BTW  this is Scala code  May need brackets to work in Java

User · Answer

I am surprised to see that all the other answers  as of Sep 8  2013  either involve counting the number of characters in the substring   null  or throw a StringIndexOutOfBoundsException if the substring is not found  Or both       I suggest the following   public class Main        public static void main String   args             String path    file txt           String extension     doc            int position   path lastIndexOf extension            if  position  -1              path   path substring 0  position           else             System out println  Extension    extension   not found             System out println  Result    path              If the substring is not found  nothing happens  as there is nothing to cut off  You won t get the StringIndexOutOfBoundsException  Also  you don t have to count the characters yourself in the substring

User · Answer

import org apache commons lang3 StringUtils      path    http   cdn gs com new downloads Q22010MVR PressRelease pdf null  StringUtils removeEnd path    null       path    http   cdn gs com new downloads Q22010MVR PressRelease pdf

[java] Remove the last chars of the Java String variable

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