java - 为什么 FileWriter 会覆盖文件，即使我确实指定它应该附加

Question

这就是我所拥有的:

try{
    String filename = "Names.txt";
    FileWriter fw = new FileWriter(filename, true);
    BufferedWriter buffer = new BufferedWriter(fw);
    buffer.append("NAME: " + name + " AGE: " + age + " ID: " + id + "\n\n");

    System.out.println("We have succefully created your account.");
    buffer.close();
    start();
} catch(IOException e){
    System.err.println("ERROR");
}

它总是覆盖第一行并且不会转到不同的行。我已经使用了附加。这是我的启动方法:

// this is the start method
public static void start(){
    System.out.println("1) Add Account 2) Exit");
    System.out.println("What do you want to do: ");
    stuff = input.nextInt();

    if (stuff == 1) {
        try {
            x = new Formatter("Names.txt");
        } catch (Exception e) {
            System.err.println("ERROR" );
        }
        newRecord();
    } else if(stuff == 2) {
        System.exit(0);
    } else {
        System.err.println("ERROR");
    }
}

Answer 1

我猜是这一行:

x = new Formatter("Names.txt");

来自javadoc

public Formatter(String fileName) throws FileNotFoundException

Parameters:

fileName - The name of the file to use as the destination of this formatter. If the file exists then it will be truncated to zero size; otherwise, a new file will be created. The output will be written to the file and is buffered.

(我强调了清理文件的部分)。