文件输出保持覆盖？

Question

我正在尝试循环获取用户输入的信息3次并将其保存到文件中.为什么文件不断被覆盖？我最初是在我的saveInfo()函数中实例化File类,但是我认为在构造函数中移动和处理它会有所帮助,但事实并非如此？

注意:此类是从主类实例化的,然后调用go().

package informationcollection;

import java.util.Scanner;
import java.util.Formatter;
import java.io.File;
import java.io.FileNotFoundException;
import java.lang.Integer;

public class Getter {

    private String name;
    private int age;
    private File fp;


    public Getter () {
        name = "";
        fp = new File("programOutput.txt");
        System.out.println("The Getter class has been instanstiated!");
    }

    public void go() {
        getInfo();
        System.out.println("The information has been saved to a file!");
    }

    public void getInfo() {
        Scanner keyboard = new Scanner(System.in);
        int i;

        for(i=0;i<3;i++) {
            System.out.println("What is your name?");
            System.out.printf(">>: ");
            name = keyboard.nextLine();

            System.out.println("How old are you?:");
            System.out.printf(">>: ");
            age = Integer.parseInt(keyboard.nextLine());
            System.out.printf("We will save that your name is %s, and you are %d years old!\n", name, age);
            saveInfo();
        }

    }

    public void saveInfo() {
        try {
            Formatter output = new Formatter(fp);
            output.format("%s is %d years old!\n", name, age);
            output.flush();
        }
        catch (FileNotFoundException ex) {
            System.out.println("File doesn't exist.");
        }



    }



}

谢谢.

Answer 1

根据Javadoc州(我自己的粗体文字):

用作此格式化程序目标的文件.如果该文件存在,那么它将被截断为零大小 ; 否则,将创建一个新文件.输出将写入文件并进行缓冲.

您可以使用类似的东西来避免文本被截断:

PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("programOutput.txt", true)));