JoptionPane驗證遇到問題

Question

我遇到的問題是與此代碼：

       String birthString = JOptionPane.showInputDialog(
           null, "Enter birth year: ", "How long have you been alive?",
           JOptionPane.QUESTION_MESSAGE);      
   Pattern p = Pattern.compile("[A-Z,a-a,&%$#@!()*^]");
   Matcher m = p.matcher(birthString);
   if (m.find()){
       JOptionPane.showMessageDialog(null, 
             "That doesn't look like numbers to me... Try again.",
             "How long have you been alive?", JOptionPane.WARNING_MESSAGE);
   }      
   int birth = Integer.parseInt(birthString);
   String currentString = JOptionPane.showInputDialog(
           null, "Enter cureent year: ", "How long have you been alive?",
           JOptionPane.QUESTION_MESSAGE);
   int current = Integer.parseInt(currentString);
   Pattern c = Pattern.compile("[A-Z,a-a,&%$#@!()*^]");
   Matcher n = c.matcher(currentString);     
   if (n.find()){
       JOptionPane.showMessageDialog(null, 
             "That doesn't look like numbers to me... Try again.",
             "How long have you been alive?", JOptionPane.WARNING_MESSAGE);
   }

我想確定的是，如果有人輸入除數字以外的任何內容，則會顯示對話框消息“對我來說這看起來不像數字...請重試”。 唯一的問題是它不執行該操作，該程序只是錯誤。 任何幫助將不勝感激，我知道這是我做錯的小事，只是找不到。

Answer 1

您要匹配一年，為什么不使用更簡單的正則表達式。 \\\\d+將匹配一個或多個整數字符。 Matcher＃matches將對完整的String進行匹配：

if (!birthString.matches("\\d+")) {
   JOptionPane.showMessageDialog(null,
    "That doesn't look like numbers to me... Try again.",
     "How long have you been alive?", JOptionPane.WARNING_MESSAGE);
}

另請： 模式