java - 向 BufferedWriter 添加新行

Question

如果将 true 作为最后一个参数传递，则每次连续调用 writeMore() 时，我都会尝试写入文本文件，并写入新行。然而，作者一直写到同一第一行的末尾。我不明白问题出在哪里。

package FileIO;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class Buffered_Writer {

    public static void main(String[] args) throws IOException{

        String fileName = "myFile.txt";
        String message = "I'm written into the file.";

        File myFile = new File("C:\\Users\\User\\Desktop\\" + fileName);
        try {
            myFile.createNewFile();
        } catch (Exception e) {
            System.out.println("Could not create file!");
        }


        BufferedWriter writer = new BufferedWriter(new FileWriter(myFile, true));
        writer.write(message);

        writeMore("This much more has been written.", myFile, true);

        writer.close();
    }

    public static void writeMore(String message, File file, boolean newLine) throws IOException{

        BufferedWriter writer = new BufferedWriter(new FileWriter(file, true));
        if (newLine) {
            writer.append(" \n");
            writer.append(message);
        }
        else {
            writer.append(" " + message);
        }
        writer.close();
    }
}

Answer 1

为什么不使用正确的方法

https://docs.oracle.com/javase/7/docs/api/java/io/BufferedWriter.html#newLine()

根据 javadocs

Writes a line separator. The line separator string is defined by the system property line.separator, and is not necessarily a single newline ('\n') character.