Question

我有一个带有数字的txt文件，我必须根据给出的数字读取文件并打印星星。我该怎么办？

public class Testing
{
  public static void main(String [] args)

    throws IOException 
  {

    FileInputStream fileInputStream = new FileInputStream("numbers.txt");
    Scanner scanner = new Scanner(fileInputStream);


    double doubleNum=(scanner.nextDouble());
    int intNumb=(int) doubleNum;
    for (int i=0;i<intNumb;i++)
      while (scanner.hasNextInt())


    {
      System.out.println("*");
    }
  } 
}

Answer 1

请尝试更具体一点。什么是输入，什么是所需的输出？如果以下情况对您没有帮助，我希望我能帮助您。

FileInputStream fileInputStream = new FileInputStream("numbers.txt");
Scanner scanner = new Scanner(fileInputStream);


while (scanner.hasNextDouble()) {
        int num = Double.valueOf(scanner.nextDouble()).intValue();
        for (int i = 0; i < num; i++) {
            System.out.print("*");
        }
        System.out.println();
    }

scanner.close();

如果您需要输出与**.***类似，例如40.001

FileInputStream fileInputStream = new FileInputStream("numbers.txt");
        Scanner scanner = new Scanner(fileInputStream);

        while (scanner.hasNext()) {
            // scanner.next() gets the next token
            // replaceAll() replaces every digits with * (\d is equal to [0-9] and it needs to be escaped with \ giving \\d)
            System.out.println(scanner.next().replaceAll("\\d", "*"));
        }

        scanner.close();
        fileInputStream.close();

Answer 2

That's the file im given.

预期输出为*取决于每个数字。

根据txt文件夹打印星标

2 个答案: