java - 如何在现有文件中追加新行？

Question

添加完我应该添加的内容后，我应该如何添加新行。我有以下代码：

        try{
            String textToAppend = question+userInput+","+typeOfAnswer;
            Files.write(Paths.get("save.txt"), textToAppend.getBytes(), StandardOpenOption.APPEND);
        }
        catch (NoSuchFileException e){

        }
        catch(IOException e){

        }

示例：问题：富​​兰克林·罗斯福的名字首字母是什么？userInput: RED typeOfAnswer 将是错误的：错误

我从一个文件中得到我的问题和真实答案，然后我将真实答案与 userInput 进行比较，看看 typeOfAnswer 是否是错误/正确的。我想在文件中输出问题、userInput 和 typeOfAnswer，但我有多个问题，因此我想在新行上分别输出最终结果。

标签： javafilenewlineprintstream

Answer 1

如评论：

textToAppend += System.lineSeparator();

证明

import java.nio.file.*;

public class Test {
    public static void main(String[] args) throws Exception {
        save("By what initials was Franklin Roosevelt better known?", "RED", "wrong");
        save("Which number president was Franklin Roosevelt?", "RED", "wrong");
    }
    public static void save(String question, String userInput, String typeOfAnswer) throws Exception {
        String textToAppend = question + userInput + "," + typeOfAnswer;
        textToAppend += System.lineSeparator();
        Files.write(Paths.get("save.txt"), textToAppend.getBytes(), StandardOpenOption.APPEND, StandardOpenOption.CREATE);
    }
}

文件内容

By what initials was Franklin Roosevelt better known?RED,wrong
Which number president was Franklin Roosevelt?RED,wrong

运行程序 3 次后的文件内容

By what initials was Franklin Roosevelt better known?RED,wrong
Which number president was Franklin Roosevelt?RED,wrong
By what initials was Franklin Roosevelt better known?RED,wrong
Which number president was Franklin Roosevelt?RED,wrong
By what initials was Franklin Roosevelt better known?RED,wrong
Which number president was Franklin Roosevelt?RED,wrong