java - 数据验证中的数据验证

Question

我首先要验证用户是否输入了一个值，并确保在按下“取消”时退出。然后，我想在将字符串转换为 java.sql.Date 的同时验证字符串 releaseDateString 的格式是否正确。

第一个验证正在进行，但随后 JOptionPane 继续 self 重复，甚至不考虑紧随其后的 try 和 catch。

这是我的方法

boolean retry = false;
java.sql.Date releaseDate = null;
String releaseDateString = "";
String title = "";

while (!retry) {
   while(!retry){//field is validated to make sure a value was entered and to exit if cancel was pushed
      releaseDateString = JOptionPane.showInputDialog("Please input the release date of the movie (yyyy-mm-dd)");
      qtd.stringValidation(releaseDateString);  
   }
   try { //the date is validated to make sure it is in the correct format
      releaseDate = java.sql.Date.valueOf(releaseDateString);
   } catch (Exception e) {
      retry = false;
      JOptionPane.showMessageDialog(null, "Make sure you enter a date in the format of 'dd-mm-yyy'");
   }
}

它链接到这个方法

public static boolean stringValidation(String attribute){
   boolean retry = false;
   if (attribute == null){
      System.exit(0);
   }
   else if (attribute.equals("")) //if the cancel button is selected or no value was entered into the 
   {
      JOptionPane.showMessageDialog(null, "Make sure you enter a character into the textbox");
   }
   else {
      retry = true;
   }
   return retry;          
}

Answer 1

当你这样做的时候，

qtd.stringValidation(releaseDateString); 

您没有将结果分配给 retry。我相信你想要，

retry = qtd.stringValidation(releaseDateString);