Java 将变量放入文本文件中，然后将它们返回到数组中

我已经完成了我的大部分项目，但我还有一个。我必须从用户那里获取数据并将其放入3个变量（

profit2012

，

profit2013

，

profit2014

），然后将它们存储在一个用逗号分隔的文本文件中。之后，我想把它们从文件中拿出来，在图形（画布）上绘制它们。我该怎么做

private static int year() {
    Scanner input = new Scanner(System.in);
    int selectedYear;
    System.out.println("Choose one of the following years: ");
    System.out.println("[1] 2012 - - [2] 2013 - - [3] 2014");
    selectedYear = input.nextInt();

    if (selectedYear == 1) {
        int Expenses2012;
        System.out.println("Please enter Expenses for this year : ");
        Expenses2012 = input.nextInt();
        int Sales2012;
        System.out.println("Please enter Sales for this year : ");
        Sales2012 = input.nextInt();

        int profit2012 = Sales2012 - Expenses2012;

    }
    if (selectedYear == 2) {
        int Expenses2013;
        System.out.println("Please enter Expenses for this year : ");
        Expenses2013 = input.nextInt();
        int Sales2013;
        System.out.println("Please enter Sales for this year : ");
        Sales2013 = input.nextInt();

        int profit2013 = Sales2013 - Expenses2013;

    }
    if (selectedYear == 3) {
        int Expenses2014;
        System.out.println("Please enter Expenses for this year : ");
        Expenses2014 = input.nextInt();
        int Sales2014;
        System.out.println("Please enter Sales for this year : ");
        Sales2014 = input.nextInt();

        int profit2014 = Sales2014 - Expenses2014;

    }try {
        main(null);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

---

如您所见，我有变量，图形已经准备好了，我只是不知道如何将它们放入文本文件中，然后读入数组，将它们用作3个矩形的高度（用逗号分隔）。

使用

ObjectOutputStream

并将集合作为对象写入文件。稍后，您可以通过

ObjectInputStream