Java扫描器读取CSV文件时读取的内容不存在

Question

I have a csv file that goes like this

Mike,Smith
Scuba,Steve
John,Doe

And java code that goes like this:

Scanner file=new Scanner(new File("input.txt"));

file.useDelimiter(",");      
while (file.hasNext()){

   String s1=file.next();
   String s2=file.next();
   System.out.println(s1+" "+s2);

}
file.close();

I get as output:

Mike Smith
Scuba
Steve
John Doe

I don't understand what could possibly make this work on the first two names but not the middle one

Answer 1

This is because Smith\\nScuba becomes one token. (There's no , separating them.)

Using

file.useDelimiter(",|\n");

solves the problem.

---

If you happen to be using Java 8, I'd recommend using something like:

Files.lines(Paths.get("input.txt"))
     .forEach(line -> {
         Scanner s = new Scanner(line);
         s.useDelimiter(",");
         System.out.println(s.next() + " " + s.next());
     });