在 java 中写入文件，更改大小写和数字

Question

我正在编写一个程序，通过执行以下操作导入文本文件并创建输出文件：

反转 input.txt 中所有字母的大小写并显示在 output.txt 中。
数字将显示为以连字符分隔的数字单词列表。（例如 123 = 一 - 二 - 三）。
还应该向控制台显示行号。

input.txt如下：

Here is A TEXT
File To Be
Processed FOR Lab09.
There are now 3459 ways to
DESIGN this kind of PROGRAM.
Here's hoping you can figure OUT 1, 2,
or 3 of these designs -
Or AT LEAST come close, even if
you don't find all 3459

我无法通过 FileReader 将 Strings 转换为 char 以正确打印到控制台和文件。非常感谢对这个新编码器的任何帮助。

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

/**
 * CSC110 Java 10am Lab09 Reading
 *
 * Writing Files file will create output file of the text formatted a certain way.
 */
public class Lab09 {

  public static void main(String[] args) throws FileNotFoundException, IOException {
    Scanner input = new Scanner(System.in);

    System.out.print("Enter name of file: ");
    String fileName = input.next();
    System.out.println();

    Scanner fileInput = new Scanner(new File(fileName));
    FileWriter fw = new FileWriter("output.txt");
    PrintWriter pw = new PrintWriter(fw);

    while (fileInput.hasNext()) {
      char c = fileInput.next().charAt(0);
      String numberToWord = "";
      pw.println(fileInput.nextLine().toUpperCase());

      if (Character.isLowerCase(c)) {
        System.out.println(fileInput.nextLine().toUpperCase());
        pw.println(fileInput.nextLine().toUpperCase());
      } else if (Character.isUpperCase(c)) {
        System.out.println(fileInput.nextLine().toLowerCase());

        if (Character.isDigit(c)) {
          switch (c) {
            case '1':
              numberToWord = numberToWord + "one";
              pw.println(fileInput.next(numberToWord));
              System.out.println(numberToWord);
              break;

            case '2':
              numberToWord = numberToWord + "two";
              pw.println(fileInput.next(numberToWord));
              System.out.println(numberToWord);
              break;

            case '3':
              numberToWord = numberToWord + "three";
              pw.println(fileInput.next(numberToWord));
              System.out.println(numberToWord);
              break;

            case '4':
              numberToWord = numberToWord + "four";
              pw.println(fileInput.next(numberToWord));
              System.out.println(numberToWord);
              break;

            case '5':
              numberToWord = numberToWord + "five";
              pw.println(fileInput.next(numberToWord));
              System.out.println(numberToWord);
              break;

            case '6':
              numberToWord = numberToWord + "six";
              pw.println(fileInput.next(numberToWord));
              System.out.println(numberToWord);
              break;
          }
        }
      }
    }

    pw.close();
    fileInput.close();
  }
}

抱歉，很难看！我只需要一些指导！非常感谢任何帮助。

Answer 1

每个数字都有一个数组

String nums [] = {"zero", "one", "two"};  // etc

然后测试char是否为数字，如果是则减去'0'的ascii

char c = '2';

if (c >= '0' && c <= '9') {
    int index = c - '0';
    System.out.println(nums [index]);
}

在 java 中写入文件，更改大小写和数字

Writing files in java, changing case and number

java

java-io