java - 为什么我无法将数据存储在 .txt 文件中？

Question

这是我正在开发的一款锻炼应用程序。这个想法是创建一个帐户(文本文件)并存储您在其中输入的数据。这是我到目前为止所拥有的。

public static void main(String[] args) {

    boolean start = true;

    while (start == true) {

        CreateNewMember();
        start = DecideToAddOrQuit();
    }
}


public static void CreateNewMember() {

    Scanner keyboard = new Scanner(System.in);
    out.println("Enter a username: ");
    String input = keyboard.nextLine();
    createMember member = new createMember(input);
    member.setMembership();
    member.setInfo();
}

public static boolean DecideToAddOrQuit() {
    Scanner keyboard = new Scanner(System.in);
    out.println("\nPress 1 if you want to continue adding data.");
    out.println("Press any other key if you want to leave.");

    String decision = keyboard.nextLine();
    if (decision.equals("1")) {
        out.println("");
        return true;
    } else {
        out.println("Goodbye!");
        return false;
    }
}

这是负责向文件添加数据的类:

public class createMember {

public String name;
private String fullName;
private String age;
private String experience;

private Formatter x;

public createMember(String name) {
    this.name = name;
}

public void setMembership() {
    try {           
        x = new Formatter(name);   
        out.println("File with name \"" + name + "\" has been created!");
    } catch (Exception e) {
        out.println("Could not create username.");
    }
}

public void setInfo () {
    Scanner keyboard = new Scanner(System.in);
    String fullNameIn, ageIn, experienceIn;

    out.println("Enter your Full Name");
    fullNameIn = keyboard.nextLine();
    fullName = fullNameIn;
    out.println("Enter your Age");
    ageIn = keyboard.nextLine();
    age = ageIn;
    out.println("Enter your lifting experience\n");
    experienceIn = keyboard.nextLine();
    experience = experienceIn;
    x.format("%s\t%s\t%s", fullName, age, experience );
 }

}

我输入的值(全名、年龄、经验)不会存储在用户名文件中。我该如何解决这个问题以及为什么会发生这种情况？

Answer 1

如果您希望在程序运行时写入输出，您可能看不到它，因为 Formatter buffers the output .

您必须close()当您使用完该文件时 (x.close())，以便写入任何剩余的缓冲数据(这不会自动发生，即使在程序退出时也是如此)。另外，如果您希望立即立即写入输出，flush()一旦你写了一行(x.flush())。