How do I write to a file without erasing the previous line?

Question

Everytime I re-ask the user to enter their grades, I have it write a string to the file gradeReport, but everytime the while loop repeats, the previous result is erased. HOw do I get several lines outputted in the file?

//Open file and call writeToFile method        
         PrintWriter outputFile= new PrintWriter("gradeReport.txt");
         outputFile.println(s.writeToFile());
         outputFile.close();

And the method:

public String writeToFile() 
    { 
     DecimalFormat f = new DecimalFormat("0.00");
        String str= name + "--" + id + "--" + f.format(getPercentage())+ "--" + getGrade();
      return str;
    }

Hovercraft Full Of Eels · Answer 1 · 2013-07-20T18:47:34.623

3

Wrap the PrintWriter around a FileWriter that is set to append to the file.

PrintWriter outputFile= new PrintWriter(new FileWriter("gradeReport.txt", true));

Note 1: the FileWriter constructor's second parameter of true means that it is set to append to the file rather than to over-write the file.
Note 2: this question will likely and appropriately be closed soon as a duplicate.

edited Jul 20 '13 at 18:47

answered Jul 20 '13 at 18:35

Hovercraft Full Of Eels

280,125
25
247
360

score 2 · Answer 2 · answered Jul 20 '13 at 18:36

2

Try using the constructor FileWriter(String filename, boolean append) to open the file in append mode.

FileWriter fw = new FileWriter("filename.txt", true);

answered Jul 20 '13 at 18:36

H3XXX

594
1
9
20

How do I write to a file without erasing the previous line?

2 Answers2