如果 - else語句

Question

我在我的if else語句中遇到了問題。

String[] keywords = { "day", "What book", "office", "hour", 
      "e-mail" }; 

    Scanner scanner = new Scanner(System.in); 
    String input = null; 
    /* -end init- */ 

    System.out.println("Welcome "); 
    System.out.println("What's on your mind?"); 
    do { 
     System.out.print("> "); 
     input = scanner.nextLine().toLowerCase(); 
     for (String keyword : keywords) { 

      if (input.contains(keyword)) { 
       parseFile(keyword); 

      } 

      else { 
       Writer(); 

      } 
     } 
     break; 
    } while (input.equalsIgnoreCase("bye")); 
    System.out.println("Have a good day!"); 

} 
} 

由於某種原因，第一個IF語句被忽略。有人可以給我一些建議。謝謝

Answer 1

我試着運行該程序，它運行良好。如果假設我輸入了day作爲輸入。然後它進入if一次和其他內部（關鍵字-1的長度）時間。請檢查您是否輸入了與關鍵字數組中給定的值相同的值。

package myApp; 

import java.util.Scanner; 

public class Client{ 
    public static void main(String[] args) { 
     String[] keywords = { "day", "Cs 377", "What book", "office", "hour", 
       "e-mail", "name", "major", "student e-mail", "group id", 
       "lectures", "lecture room", "lecture time", 
       "number of lectures", "current lecture", 
       "topics of current lecture", "number of test", 
       "date of a test", "number of assignments", "sure", 
       "current assignment", "due day" }; 

     Scanner scanner = new Scanner(System.in); 
     String input = null; 
     /* -end init- */ 

     System.out.println("Welcome "); 
     System.out.println("What's on your mind?"); 
     do { 
      System.out.print("> "); 
      input = scanner.nextLine().toLowerCase(); 
      for (String keyword : keywords) { 

       if (input.contains(keyword)) { 
        System.out.println("KEYWORD:" + keyword); 
        break; 
       } 

       else { 
        System.out.println("KEYWORD not found"); 

       } 
      } 
      break; 
     } while (input.equalsIgnoreCase("bye")); 
     System.out.println("Have a good day!"); 

    } 
} 

我更換了一些東西里面，如果和其他與sysout。 我在輸入一天輸入並得到以下結果。

Welcome 
What's on your mind? 
> day 
KEYWORD:day 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
KEYWORD not found 
Have a good day! 

這個輸出很好理解。如果您覺得困難，請在下面評論您所面臨的問題。

Answer 2

使用map會減少整個數組的循環，每次檢查是否。