Append to an existing file in a new line

I want to write some texts in a new line into an existing file.I tried following code开发者_如何学C but failed,Can any one suggest how can I append to file in a new row.

private void writeIntoFile1(String str) {
    try {
        fc=(FileConnection) Connector.open("file:///SDCard/SpeedScence/MaillLog.txt");
        OutputStream os = fc.openOutputStream(fc.fileSize());
        os.write(str.getBytes());
        os.close();
        fc.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

and calling

writeIntoFile1("aaaaaaaaa");
writeIntoFile1("bbbbbb");

Its successfully writing to the file I simulated(SDCard) but its appears in the same line. How can I write "bbbbbb" to new line?

---

Write a newline (\n) after writing the string.

private void writeIntoFile1(String str) {
    try {
        fc = (FileConnection) Connector.open("file:///SDCard/SpeedScence/MaillLog.txt");
        OutputStream os = fc.openOutputStream(fc.fileSize());
        os.write(str.getBytes());
        os.write("\n".getBytes());
        os.close();
        fc.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

N.B. a PrintStream is generally better-suited for printing text, though I'm not familiar enough with the BlackBerry API to know if it's possible to use a PrintStream at all. With a PrintStream you'd just use println():

private void writeIntoFile1(String str) {
    try {
        fc = (FileConnection) Connector.open("file:///SDCard/SpeedScence/MaillLog.txt");
        PrintStream ps = new PrintStream(fc.openOutputStream(fc.fileSize()));
        ps.println(str.getBytes());
        ps.close();
        fc.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}