Question

In a java program, I am copying some text line-by-line into a string variable.

And then writing that data (again as text is retrieved line by line) into a second text file, using Files.newBufferedWriter

For some reason, the writing stops at a specific line # and col # in the second file-even though there are many more lines of text to be written. I even tried outputting messages to logs that writing is taking place at line # — and the messages continue beyond line #892, till line #1098– but the data is written only till line #892 in the second file.

AFAIK BufferedWriter can write data to large files- then why is this happening in my program?

For reference, the code snippets showing writing of data are given below-

BufferedWriter writer;
     if(outputmode.equalsIgnoreCase("append"))
        writer = Files.newBufferedWriter(path_target, ENCODING,  StandardOpenOption.APPEND);
else if(outputmode.equalsIgnoreCase("overwrite"))
    writer = Files.newBufferedWriter(path_target, ENCODING,  StandardOpenOption.CREATE);

And the actual code writing text (in string variable “currentline”) to the file is as shown below–

    writer.write(currentline);
    writer.newLine();

How do I solve this problem?

Answer 1

You might need to flush the buffered writer to write all the contents to file.