ファイルに配列を書き込むにはどうすればよいですか？

Question

出力ファイルに出力を書き込む方法が完全に固まっています。うまくいけば私はもっと明確にするためにいくつかの情報を提供しました。私を助けることができる誰にも感謝します。

出力1234は、入力（私はtxtファイルに書き込まれるように、これを必要とする）である。現在、txtファイルに書き込まれている何

Your original number was: 
1234 
The reversed digits are: 
4321 
The even digits are: 
2 4 
The odd digits are: 
1 3 

：ここ

Your original number was: 
1234 

は私です今すぐコード：

import java.util.Scanner; 
    import java.io.*; 

    public class order { 

    //Input validation. Allows any integer greater than 0. Any number starting 
    with 0 is invalid. 

    private static void validate(Scanner input) { 

     String userEntry;  

     System.out.println("Please enter a positive integer greater than 0."); 
     userEntry = input.nextLine(); 

     while (!userEntry.matches("^[1-9][0-9]*$")) { 
      System.out.println("Invalid number. Try again"); 
      userEntry = input.nextLine(); 
     } 

     try { 
      FileWriter writer = new FileWriter("outDataFile.txt", true); 
      PrintWriter outputfile = new PrintWriter(writer); 

      outputfile.println("Your original number was: "); 
      outputfile.println(userEntry); 
      System.out.println("Your original number was: "); 
      System.out.println(userEntry); 

      System.out.println("The reversed digits are: "); 
      reverse (input, userEntry); 
      System.out.println(); 

      System.out.println("The even digits are: "); 
      even (input, userEntry); 
      System.out.println(); 

      System.out.println("The odd digits are: "); 
      odd (input, userEntry); 
      System.out.println(); 

      } catch (IOException e){    
     }    
    } 

    //Reverses the order of digits. 

    public static void reverse(Scanner keyboard, String intString) { 

     int strsize = intString.length(); 
     int[] digits = new int[strsize]; 

     for (int i = 0; i < strsize; ++i) 
     { 
      String temp = Character.toString(intString.charAt(i)); 
      digits[i] = Integer.parseInt(temp); 
     } 

     for (int i = strsize - 1; i >= 0; --i) 
     { 
      System.out.print(digits[i]); 
     } 
    } 

    //Extracts even numbers. 
    public static void even (Scanner keyboard2, String intString2) { 

     int strsize2 = intString2.length(); 
     int[] digits2 = new int[strsize2]; 

     for (int i = 0 ; i < strsize2 ; ++i) { 

       String temp = Character.toString(intString2.charAt(i)); 
       digits2[i] = Integer.parseInt(temp); 

       if(digits2[i] % 2 == 0) { 
       System.out.print(digits2[i] + " "); 
      } 
     }           
    } 

    //Extracts odd numbers. 

    public static void odd (Scanner keyboard3, String intString3) { 

     int strsize3 = intString3.length(); 
     int[] digits3 = new int[strsize3]; 

     for (int i = 0 ; i < strsize3 ; ++i) { 

       String temp = Character.toString(intString3.charAt(i)); 
       digits3[i] = Integer.parseInt(temp); 

       if(digits3[i] % 2 != 0) { 

       System.out.print(digits3[i] + " ");        
      } 
     }           
    } 

    //Allows continuous input. 

    public static void main(String[] args) {     

     Scanner keyboard = new Scanner(System.in); 

     boolean validate = true;    
     while (validate) { 
     validate(keyboard); 

     boolean invalid = true;                  
     while (invalid) { 
      System.out.println("Would you like to try another calculation? [y/n]");    

      Scanner input = new Scanner(System.in); 
      char answer; 
      String option = input.next(); 

      if ("y".equalsIgnoreCase(option)) {       
       invalid = false; 
      } 
      else if ("n".equalsIgnoreCase(option)) {      
       invalid = false; 
       validate = false; 
        System.out.println("Goodbye.");    
        input.close(); 
      } 
      else {                     
       System.err.println("The only valid answers are y/n."); 
       System.out.println(); 
      } 
      } 
     } 
    } 
} 

Answer 1

以下のcをテストしたファイルに逆の番号を書き込むために働くode。他の方法にも同じテクニックを適用できます。すべての配列要素を同じ行に取得するには、PrintWriter.printlnではなくPrintWriter.printを使用しています。

public class Order { 

    PrintWriter outputfile; 
    FileWriter writer; 

    public void validate(Scanner input) { 

     String userEntry;  

     System.out.println("Please enter a positive integer greater than 0."); 
     userEntry = input.nextLine(); 

     while (!userEntry.matches("^[1-9][0-9]*$")) { 
      System.out.println("Invalid number. Try again"); 
      userEntry = input.nextLine(); 
     } 

     try { 
      writer = new FileWriter("outDataFile.txt", true); 
      outputfile = new PrintWriter(writer); 

      outputfile.println("Your original number was: "); 
      outputfile.println(userEntry); 
      outputfile.flush(); 
      System.out.println("Your original number was: "); 
      System.out.println(userEntry); 

      System.out.println("The reversed digits are: "); 
      outputfile.println("The reversed digits are: "); 
      reverse (input, userEntry, writer); 
      System.out.println(); 

     } catch (IOException e){    
     }    
    } 

    //Reverses the order of digits. 
    public void reverse(Scanner keyboard, String intString, FileWriter writer) { 

     outputfile = new PrintWriter(writer); 

     int strsize = intString.length(); 
     int[] digits = new int[strsize]; 

     for (int i = 0; i < strsize; ++i) 
     { 
      String temp = Character.toString(intString.charAt(i)); 
      digits[i] = Integer.parseInt(temp); 
     } 

     for (int i = strsize - 1; i >= 0; --i) 
     {   
      System.out.print(digits[i]); 
      outputfile.print(digits[i]); 
      outputfile.flush(); 
     } 
    } 
} 

Answer 2

あなたのtryブロックに問題があります。

誤：

outputfile.println("Your original number was: "); 
     outputfile.println(userEntry); 
     System.out.println("Your original number was: "); 
     System.out.println(userEntry); 

    System.out.println("The reversed digits are: "); 
    reverse (input, userEntry); 
    System.out.println(); 

    System.out.println("The even digits are: "); 
    even (input, userEntry); 
    System.out.println(); 

    System.out.println("The odd digits are: "); 
    odd (input, userEntry); 
    System.out.println(); 

問題：あなたは、ほとんどの

正しい 'のoutputfile.printlnとS' System.out.printlnをミラーリングする必要があります：私はしました

outputfile.println("Your original number was: "); 
outputfile.println(userEntry); 
System.out.println("Your original number was: "); 
System.out.println(userEntry); 

System.out.println("The reversed digits are: "); 
reverse (input, userEntry); 
System.out.println(); 
outputfile.println("The reversed digits are: "); 
reverse (input, userEntry); 
outputfile.println(); 


System.out.println("The even digits are: "); 
even (input, userEntry); 
System.out.println(); 
outputfile.println("The even digits are: "); 
even (input, userEntry); 
outputfile.println(); 

System.out.println("The odd digits are: "); 
odd (input, userEntry); 
System.out.println(); 
outputfile.println("The odd digits are: "); 
odd (input, userEntry); 
outputfile.println();