Java Scanner won't “finish” reading input

Question

I\'ve been having trouble using java\'s Scanner class. I can get it to read my input just fine, but the problem is when I want to output something. Given multiple lines of i

Answer 1

The magic of

Scanner scanner = new Scanner(System.in);
    while(scanner.hasNextLine()){ 

Is that there will never stop being input from System (unless you close the input with ctrl+d (for macs)).

To stop the loop, I suggest throw something more in the condition than just hasNextLine().

E.g.

Scanner scanner = new Scanner(System.in);   //scanner reads block of input
    int BLOCK_SIZE  =3,count=1;
    while(scanner.hasNextLine() && count++ <= BLOCK_SIZE){   //<- Use count here.
        //body of loop goes here
        String s = scanner.nextLine();
        Scanner ls = new Scanner(s);   //scanner to parse a line of input
        while(ls.hasNext()){
        //body of nested loop goes here
        ls.next();
        }
    }
    System.out.println("Fin");

}