java - 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？我已经尝试了一切，比如在 try catch 之外初始化 Date 对象，但它仍然不起作用。帮助!

Answer 1

因为一旦 try block 完成，变量就超出了范围。将 jOptionPane 代码移到 try block 内或将 createDate 声明移到 try block 外。