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Asked: 2026-06-10T07:19:05+00:00

I have 1 file, which contains some String that need to be updated. MY

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I have 1 file, which contains some String that need to be updated.

MY REPORT
REPORT RUN DATE : 27/08/2012 12:35:11 PAGE 1 of @TOTAL@                                              
SUCCESSFUL AND UNSUCCESSFUL DAILY TRANSACTIONS REPORT                                                                                    
---record of data here----

MY REPORT                                                                                                                                                 
REPORT RUN DATE : 27/08/2012 12:35:11 PAGE 2 of @TOTAL@                                              
SUCCESSFUL AND UNSUCCESSFUL DAILY TRANSACTIONS REPORT
---record of data here----

In case I just want to update all occurence of @TOTAL@ to some number, is there a quick and effecient way to do this?

I understand that I can also use BufferedReader+BufferedWriter to print to another file and use String.replace it along the way, but I wonder if there is a better and elegant way to solve this…

The file wont exceed 10MB, so there is no need to concern whether the file can be to big ( exceed 1 GB etc )

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1 Answer

  1. Editorial Team

    … I wonder if there is a better and elegant way to solve this

    It depends on what you mean by “better and elegant”, but IMO the answer is no.

    The file wont exceed 10MB, so there is no need to concern whether the file can be to big ( exceed 1 GB etc )

    You are unlikely to exceed 1Gb. However:

    • You probably cannot be 100% sure that the file won’t be bigger that 10Mb. For any program that has a significant life-time, you can rarely know that the requirements and usage patterns won’t change over time.

    • In fact, a 10Mb text file may occupy up to 60Mb of memory if you load the entire lot into a StringBuilder. Firstly, the bytes are inflated into characters. Secondly, the algorithm used by StringBuilder to manage its backing array involves allocating a new array of double the size the original one. So peak memory usage could be up to 6 times the number of bytes in the file you are reading.

    • Note that 60Mb is greater than the default maximum heap size for some JVMs on some platforms.

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