无法读取try catch中的变量

Question

String selectedDate = "2012-" + createdMonth
        + "-" + createdDay;

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd");

try {
    Date createdDate = dateFormat.parse(selectedDate);
} catch (ParseException e1) {
    // TODO Auto-generated catch block
    e1.printStackTrace();
}

int x = JOptionPane.showOptionDialog(frame,
    "Here is your new booking schedule:\n "
        + "Timeslot: "
        + selectedTimeslot + "\n"
        + "Date: " + createdDate + "\n"
        + "Continue?",
    "Booking Confirmation",
    JOptionPane.YES_NO_OPTION,
    JOptionPane.QUESTION_MESSAGE, null,
    options, options[1]);

问题是JOptionPane中的createdDate无法解析为变量.这是为什么？我已经尝试过所有的东西,比如在try catch之外初始化Date对象,但它仍然不起作用.救命!

Answer 1

因为一旦try块完成,变量就超出了范围.将jOptionPane代码移动到try块内部或将createDate声明移到try块之外.