Update text file whitout losing information

Question

this part of code replace information in file, how to save information and everytime update It? I mean I want have like a history of answers in text file.

try {
    File file = new File("src/test/History.txt");

    if (!file.exists()) {
        file.createNewFile();
    }

    FileWriter fw = new FileWriter(file.getAbsoluteFile());
    BufferedWriter bw = new BufferedWriter(fw);
    bw.write("bla bla bla");
    bw.close();


} catch (IOException e) {
    e.printStackTrace();
}

possible duplicate of http://stackoverflow.com/questions/1625234/how-to-append-text-to-an-existing-file-in-java — Igor, Nov 13 '12 at 12:31

score 4 · Answer 1 · answered Nov 13 '12 at 12:30

4

If you want to append to a file that you have previously written to, use:

FileWriter(String fileName, boolean append)

answered Nov 13 '12 at 12:30

mxns

199
1
7

Yes, I want append. And how in my code must look this line? I need to delete my `FileWriter fw = new FileWriter(file.getAbsoluteFile());`? – Nov 13 '12 at 12:35
No, just add the argument `true` to the FileWriter constructor – mxns Nov 13 '12 at 12:48

Magus · Accepted Answer · 2012-11-13T12:52:24.107

1

You want to open your file in append mode. To do so, you must add a boolean in the FileWriter constructor.

FileWriter fw = new FileWriter(file.getAbsoluteFile(), true);

See the FileWriter documentation for more infirmations.

edited Nov 13 '12 at 12:52

answered Nov 13 '12 at 12:33

Magus

14,796
3
36
51

Update text file whitout losing information

2 Answers2