I have a little problem with input in my program...(System.in, BufferedRead

Question

I'm coding a program that takes a input like this :
Sample Input
1 11 5
2 6 7
3 13 9
12 7 16
14 3 25
19 18 22
23 13 29
24 4 28
So I wrote a code like this :
public static void main(String[] args) throws Exception{
          BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
          String input = null;
               while((input = br.readLine()) != null) {
               StringTokenizer st = new StringTokenizer(input);
               int leftX = Integer.parseInt(st.nextToken());
               int height = Integer.parseInt(st .nextToken());
               int rightX = Integer.parseInt(st.nextToken());
.... rest of the code....
But unlike I expected, the program did not pass the while loop.
When I observed in debugging mode, when "br.readLine()" has no more strings to read,
the whole program just becomes idle doing nothing, and it does not proceed further.
Is there any problem with my code there? I've been trying to figure it out for hours... Please help!!!

Answer 1

myunghajang wrote:
Why doesn't it work in a way I intended? BufferedReader returns null if there is no more string to read, and what's the problem?
It's so frustrating...The computer doesn't have a mind reading input, how is your program supposed to know you have finished typing the input?
If you put the data in a file and redirect it into your program on the command line it will work (because the file knows where its end is)
Your program could instead assume that a blank line is you end of input.