Create a new line in Java's FileWriter

Question

I have coded the following FileWriter:

try {
    FileWriter writer = new FileWriter(new File("file.txt"), false);

    String sizeX = jTextField1.getText();
    String sizeY = jTextField2.getText();
    writer.write(sizeX);
    writer.write(sizeY);

    writer.flush();
    writer.close();
} catch (IOException ex) {}

Now I want to insert a new line, just like you would do it with \n normally, but it doesn't seem to work.

What can be done to solve this?

Thank you.

If I try the "\n" method, there's nothing... just 1254 (12 for sizeX, 54 for sizeY)... — log_0, Aug 31 '13 at 15:38
@lukulus could you try `writer.write("\r\n");` or better `writer.write(System.lineSeparator())`? — Pshemo, Aug 31 '13 at 15:40
Do not edit the question to [invalidate existing answers](https://meta.stackoverflow.com/a/290704/3956566). — , Mar 24 '19 at 10:57

Pshemo · Accepted Answer · 2016-09-23T09:43:46.693

If you want to get new line characters used in current OS like \r\n for Windows, you can get them by

System.getProperty("line.separator");
since Java7 System.lineSeparator()
or as mentioned by Stewart generate them via String.format("%n");

You can also use PrintStream and its println method which will add OS dependent line separator at the end of your string automatically

PrintStream fileStream = new PrintStream(new File("file.txt"));
fileStream.println("your data");
//         ^^^^^^^ will add OS line separator after data

(BTW System.out is also instance of PrintStream).

score 32 · Answer 2 · answered Aug 31 '13 at 15:37

32

Try System.getProperty( "line.separator" )

   writer.write(System.getProperty( "line.separator" ));

answered Aug 31 '13 at 15:37

Prabhaker A

8,317
1
18
24

score 13 · Answer 3 · answered Aug 31 '13 at 15:36

13

Try wrapping your FileWriter in a BufferedWriter:

BufferedWriter bw = new BufferedWriter(writer);
bw.newLine();

Javadocs for BufferedWriter here.

answered Aug 31 '13 at 15:36

Stewart

17,616
8
52
80

score 3 · Answer 4 · edited May 23 '17 at 11:54

3

Try:

String.format("%n");

See this question for more details.

edited May 23 '17 at 11:54

Community

1
1

answered Aug 31 '13 at 15:33

Stewart

17,616
8
52
80

score 3 · Answer 5 · edited Jun 03 '16 at 19:37

If you mean use the same code but add a new line so that when you add something to the file it will be on a new line. You can simply use BufferedWriter's newLine().
Here I have Improved you code also: NumberFormatException was unnecessary as nothing was being cast to a number data type, saving variables to use once also was.

try {
    BufferedWriter writer = new BufferedWriter(new FileWriter("file.txt"));
        writer.write(jTextField1.getText());
        writer.write(jTextField2.getText());
        writer.newLine();
        writer.flush();
        writer.close();
} catch (IOException ex) {
    System.out.println("File could not be created");
}

Nick Bell · Answer 6 · 2016-09-09T16:25:44.873

Since 1.8, I thought this might be an additional solution worth adding to the responses:

Path java.nio.file.Files.write(Path path, Iterable lines, OpenOption... options) throws IOException

StringBuilder sb = new StringBuilder();
sb.append(jTextField1.getText());
sb.append(jTextField2.getText());
sb.append(System.lineSeparator());
Files.write(Paths.get("file.txt"), sb.toString().getBytes());

If appending to the same file, perhaps use an Append flag with Files.write()

Files.write(Paths.get("file.txt"), sb.toString().getBytes(), StandardOpenOption.APPEND);

score 1 · Answer 7 · answered Jan 26 '15 at 12:18

1

Here "\n" is also working fine. But the problem here lies in the text editor(probably notepad). Try to see the output with Wordpad.

answered Jan 26 '15 at 12:18

Roushan Kumar

77
8

Smart one! Worked for me and should work for assignments. However for a project, any of the above highlighted approaches should be used – Navin Israni Apr 10 '16 at 07:54
yes, Notepad doesn't work with `/n`, but WordPad works fine with `/n`. Or need to use `line.separator` for Notepad. – invzbl3 Aug 04 '19 at 13:05

score 1 · Answer 8 · answered Feb 23 '21 at 19:10

One can use PrintWriter to wrap the FileWriter, as it has many additional useful methods.

try(PrintWriter pw = new PrintWriter(new FileWriter(new File("file.txt"), false))){
   pw.println();//new line
   pw.print("text");//print without new line
   pw.println(10);//print with new line
   pw.printf("%2.f", 0.567);//print double to 2 decimal places (without new line)
}

score 0 · Answer 9 · answered Aug 31 '13 at 15:53

I would tackle the problem like this:

    BufferedWriter output;
    output = new BufferedWriter(new FileWriter("file.txt", true));
    String sizeX = jTextField1.getText();
    String sizeY = jTextField2.getText();
    output.append(sizeX);
    output.append(sizeY);
    output.newLine();
    output.close();

The true in the FileWriter constructor allows to append.
The method newLine() is provided by BufferedWriter
Could be ok as solution?

score -1 · Answer 10 · answered May 14 '22 at 06:53

-1

using simple \n to break line in write file and normal output in java

answered May 14 '22 at 06:53

Pankaj Chouhan

1
1

1

Your answer doesn't add anything to the question, which hasn't been answered already. – Janos May 15 '22 at 14:16

Create a new line in Java's FileWriter

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