Limit file size while writing in java

Question

I need to limit the file size to 1 GB while writing preferably using BufferedWriter.

Is it possible using BufferedWriter or I have to use

Answer 1

int maxSize = 1_000_000_000;
Charset charset = StandardCharsets.UTF_F);

int size = 0;
int lineCount = 0;
while (lineCount < lines.length) {
     long size2 = size + (lines[lineCount] + "\r\n").getBytes(charset).length;
     if (size2 > maxSize) {
         break;
     }
     size = size2;
     ++lineCount;
}

List linesToWrite = lines.substring(0, lineCount);
Path path = Paths.get("D:/test.txt");
Files.write(path, linesToWrite , charset);

Or a bit faster while decoding only once:

int lineCount = 0;
try (FileChannel channel = new RandomAccessFile("D:/test.txt", "w").getChannel()) {
    ByteBuffer buf = channel.map(FileChannel.MapMode.WRITE, 0, maxSize);
    lineCount = lines.length;
    for (int i = 0; i < lines.length; i++) {
        bytes[] line = (lines.get(i) + "\r\n").getBytes(charset);
        if (line.length > buffer.remaining()) {
            lineCount = i;
            break;
        }
        buffer.put(line);
    }
}