java - 从txt文件中读取整数并存储到数组中

Question

我在仅从文本文件读取和存储整数时遇到问题。我使用的是 int 数组，所以我想在没有列表的情况下执行此操作。我收到输入不匹配异常，但我不知道应该如何纠正该问题。正在读取的文本文件还包括字符串。

  public static Integer[] readFileReturnIntegers(String filename) {
     Integer[] array = new Integer[1000];
     int i = 0;
    //connect to the file
     File file = new File(filename);
     Scanner inputFile = null;
     try {
        inputFile = new Scanner(file);
     } 
     //If file not found-error message
        catch (FileNotFoundException Exception) {
           System.out.println("File not found!");
        }
    //if connected, read file
     if(inputFile != null){         
        System.out.print("number of integers in file \"" 
              + filename + "\" = \n");
        //loop through file for integers and store in array     
        while (inputFile.hasNext()) {
           array[i] = inputFile.nextInt();
           i++;
        }
        inputFile.close();
     }
     return array;
  }

Answer 1

您可以使用类似的东西(跳过任何非整数)，并且您应该关闭您的扫描仪!

// if connected, read file
if (inputFile != null) {
  System.out.print("number of integers in file \""
      + filename + "\" = \n");
  // loop through file for integers and store in array
  try {
    while (inputFile.hasNext()) {
      if (inputFile.hasNextInt()) {
        array[i] = inputFile.nextInt();
        i++;
      } else {
        inputFile.next();
      }
    }
  } finally {
    inputFile.close();
  }
  // I think you wanted to print it.
  System.out.println(i);
  for (int v = 0; v < i; v++) {
    System.out.printf("array[%d] = %d\n", v, array[v]);
  }
}