验证数据+使用扫描仪输入的BufferedWriter逐行写入

Question

我的简要介绍是写一些关于员工的数据（将年龄作为整数验证，将薪水验证为双倍。）一旦经过验证，必须逐行将信息写入文件。必须有3个员工记录。

我的当前代码，如下所示，接受12行数据并将它们逐行放入文件中。我不确定的是如何验证输入。我需要名字和标题作为任何东西，然后我需要年龄作为整数和薪水双倍。

    public static void main(String[] args) {

    Scanner employeeData = new Scanner (System.in);

    System.out.println("Please enter the employee name, title, age and salary. Press enter after each piece of information: ");
    try {
        File file = new File("employee.txt");
        FileWriter fw = new FileWriter(file);
        BufferedWriter bw = new BufferedWriter(fw);
        for (int i = 0; i < 12; i++) {

            bw.write(employeeData.next() + System.getProperty("line.separator"));
        }

        bw.close();
    }catch (IOException e1) {
        System.err.println("The file doesn't exist.");
    }
    catch (InputMismatchException e2) {
        System.err.println("Incorrect data type. Name and job title can be string, age whole number and Salary must be double (with decimals).");
    }


    finally{

        System.out.println("Done.");

    }
    employeeData.close();
}

}