java int toString() 错误

Question

嘿，我正在编写一个程序来计算文本文件的单词、句子、元音、字符......等。 我想使用 toString() 连接所有类和结尾并以以下格式返回它们： {filename}: {character count}c {vowel count}v {word count}w {line count}l {sentence count }s. 我在使用 int 类时遇到了问题。 Ex (charCount.toString())'c' + .... 到目前为止，这是我的代码。 谢谢

import java.io.FileInputStream;

public class TextFileAnalyzer {

    public static void main(String[] args) {
        try {
            TextFileAnalyzer mytfa = new TextFileAnalyzer("/Users/patrickmro/Desktop/text.txt");
            System.out.println(mytfa.getCharCount());
            System.out.println(mytfa.getSentenceCount());
            System.out.println(mytfa.getLineCount());
            System.out.println(mytfa.getVowelCount());
        }
        catch (Exception e) {

        }


    }

  // You'll probably want some private fields
    private java.lang.String filePath; 
    private int sentenceCount; 
    private int wordCount; 
    private int charCount;
    private int lineCount; 
    private int vowelCount; 
    private java.lang.String textString;
  /**
   * Constructs a new TextFileAnalyzer that reads from the given file. All file
   * I/O is complete once this constructor returns.
   * @param filePath a path to the file
   * @throws Exception if any errors are generated by the Java API while reading
   *           from the file
   */
  public TextFileAnalyzer(String filePath) throws Exception {
    // This is your job...
      this.filePath = filePath; 
      charCount = 0;
      int prevChar = -1;
      FileInputStream input = new FileInputStream(filePath);
      for(int c = input.read(); c != -1 ; c = input.read()) {
          charCount++; 
          if (c == '.' && prevChar != '.') {
              sentenceCount++;
          }
          if(c == '\n') {
              lineCount++;
          }
          if(Character.isWhitespace(c) && (prevChar != -1 || !Character.isWhitespace(prevChar) )) {
              wordCount++;
          } 
          prevChar = c; 
          if(c == 'A' || c == 'E' || c == 'I'|| c == 'O' || c == 'U') {
              vowelCount++;
          }
          if(c == 'a' || c == 'e' || c == 'i'|| c == 'o' || c == 'u') {
              vowelCount++;
          }

      }

      lineCount++;
      input.close(); 
  }


  /**
   * Returns the number of single-byte characters in the file, including
   * whitespace.
   * 
   * @return the number of characters in the file
   */
   public java.lang.String getfilePath() {
     return this.filePath; 
     }

  public int getSentenceCount() {
      return  sentenceCount ; 
  }
  public int getWordCount() {
      return wordCount  ; 
  }

  public int getCharCount() {
      return charCount ; 
  }

  public int getLineCount() {
      return lineCount ;
  }

  public int getVowelCount() {
      return vowelCount;
  }
  public java.lang.String toString() {

     // {filename}: {character count}c {vowel count}v {word count}w {line count}l {sentence count}s
      return (this.getfilePath())':' + (sentenceCount.toString())'s' + (wordCount.toString())'w';

  }

}

Answer 1

更简单的一种：更改此方法如下，它会起作用（由于字符串连接，在此期间非字符串会自动转换为字符串。

public java.lang.String toString() {
   return this.getfilePath() + ":" + sentenceCount + "s" + wordCount + "w";
}

或者，将int （它是整数的原始数据类型，因此没有像toString()这样的方法）替换为Integer （它是整数的 Java 类，将原始int包装在其中，并且由于它是一个类，因此它具有像toString() ）这样的方法在你的代码中无处不在，你会很好。

例如替换：

private int sentenceCount;

和：

private Integer sentenceCount;

还将方法的返回类型从int更改为Integer 。

Answer 2

int 是 Java 中的原始类型，因此没有与之关联的方法。 但是你不需要使用toString()这应该可以正常工作return this.getfilePath() +':' + sentenceCount + 's' + wordCount + 'w';