Java - 當按下取消或'x'時，我的JOptionPane沒有關閉

Question

我有以下測試另一個類（MyDate）的類（testDate），當這3行被執行時，inputDialog框沒有關閉取消或稍微'x'右上角。

myDay = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter the day of the month, you're travelling on: ")); 
myMonth = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter the month (1-12), you're travelling on: ")); 
myYear = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter the year, you're travelling on: ")); 

以下是完整的testDate類：

import javax.swing.JOptionPane; 

public class testDate { 
public static void main(String[] args){ 
    int myDay = 0, myMonth = 0, myYear = 0; // initialising variables 
    boolean dateCorrect = false; 
    MyDate userTravelDate; 

    do { 
     try { 
      do { 
       myDay = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter the day of the month, you're travelling on: ")); 
       myMonth = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter the month (1-12), you're travelling on: ")); 
       myYear = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter the year, you're travelling on: ")); 
       userTravelDate = new MyDate(myDay, myMonth, myYear); 
      } while (userTravelDate.isDateValid(userTravelDate.formDate()) == false); 
      dateCorrect = true; 
     } 
     catch (Exception e) { 
      JOptionPane.showMessageDialog(null, "Please enter only integers!", "Error Occurred!", JOptionPane.ERROR_MESSAGE); 
     } 
    } while (dateCorrect == false); 
    JOptionPane.showMessageDialog(null, myDay + "-" + myMonth + "-" + myYear);  
} 

}

我想知道，如果輸入對話框可以被關閉，如果我按「X」或取消，因爲在當'x'或者取消被按下的時候它執行該行：

JOptionPane.showMessageDialog(null, "Please enter only integers!", "Error Occurred!", JOptionPane.ERROR_MESSAGE); 

並且持續循環詢問白天，月份和年份，直到這些都是正確的。

Answer 1

你可以檢查的showInputDialog和break響應圈外在沒有響應

String response = JOptionPane.showInputDialog(...); 
if (response == null) { 
    break; // X pressed! 
} else { 
    myDay = Integer.parseInt(result); 
    ... 
}