如果沒有運行語句

Question

字符串被解析爲整數，所以if語句的條件已正確設置。爲什麼if語句沒有運行？爲什麼沒有出現帶有響應的MessageDialog？

class process{ 
    public static void whoIs(){ 

     JFrame frame=new JFrame("The Oldest"); 
      String a=JOptionPane.showInputDialog(frame, "Enter, please, the first name and age:", "QUIZ: Who is the Oldest", JOptionPane.QUESTION_MESSAGE); 
      String b=JOptionPane.showInputDialog(frame, "Enter, please, the second name and age:", "QUIZ: Who is the Oldest", JOptionPane.QUESTION_MESSAGE); 


      String age1=a.replaceAll("[^\\d]",""); 
      String age2=a.replaceAll("[^\\d]",""); 



      String name1=a.replaceAll("\\d",""); 
      String name2=b.replaceAll("\\d",""); 


      int age1int=Integer.parseInt(age1); 
      int age2int=Integer.parseInt(age2); 



      if (age1int>age2int){ 
       JOptionPane.showMessageDialog(frame, name1+ " is the oldest!", "QUIZ: Who is the Oldest?", JOptionPane.INFORMATION_MESSAGE); 
      } 

      if (age2int>age1int) { 
       JOptionPane.showMessageDialog(frame, name2+ " is the oldest!", "QUIZ: Who is the Oldest?", JOptionPane.INFORMATION_MESSAGE); 
      } 

    } 
} 

Answer 1

你的兩個年齡都一樣，你的條件不匹配，因爲你不考慮平等。我想你錯過了這一點，下次嘗試使用調試器，然後你可以自己識別這些類型的問題。

String age1=a.replaceAll("[^\\d]",""); 
String age2=a.replaceAll("[^\\d]",""); 

這應該將其更改爲以下內容。

String age1=a.replaceAll("[^\\d]",""); 
    String age2=b.replaceAll("[^\\d]","");