Java读取数字文件并打印出来

Question

I have this code

Scanner scanner = new Scanner("hello.txt");
   while(scanner.hasNextInt()){
       int i = scanner.nextInt();
       System.out.println(i);
    }

the data values I have in a hello.txt are

1 2 3 22 33 123

but when I run the program there is no output. Is there something I am not using / line of code??

Answer 1

The Scanner constructor you are using takes a string from which to read values . It's not a filename. There are no integers in the string hello.txt so you get no output.

If you want to read from the file called hello.txt , try

Scanner scanner = new Scanner(new File("hello.txt"));

Answer 2

它应该是

Scanner scanner = new Scanner(new File("hello.txt"));