Better way to read nextLine

Question

Working through a HackerRank tutorial, and I was wondering -- is there a better way to strip off the newline character that comes after reading in the double? It feels really manual and "hacky" to just repeat a nextLine()

import java.util.Scanner;

public class Solution {

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    int i = scan.nextInt();
    double d = scan.nextDouble();
    String b = scan.nextLine();
    String s = scan.nextLine();
}

}

Note: code works as-is, just asking if there is a less hacky way to go about this

Whoops, I should have clarified -- `String b` isn't actually being used other than for the Scanner to pass over the newline char after it reads in the preceding double. — Tyler Poland, Feb 09 '17 at 04:18

Elliott Frisch · Accepted Answer · 2017-02-09T04:39:40.767

1

Operate on lines at a time, then you don't need to worry about the nextDouble() (or nextInt()) calls leaving a trailing newline. Like,

Scanner scan = new Scanner(System.in);
int i = Integer.parseInt(scan.nextLine());
double d = Double.parseDouble(scan.nextLine());
String s = scan.nextLine();

If, you want to allow the int and double to be on the same line then you could do

Scanner scan = new Scanner(System.in);
int i = scan.nextInt();
double d = Double.parseDouble(scan.nextLine());
String s = scan.nextLine();

But without knowing your input format, that may or not be helpful. I would prefer the version most readable for the problem at hand (parsing the input).

edited Feb 09 '17 at 04:39

answered Feb 09 '17 at 04:16

Elliott Frisch

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`int i = scan.nextInt()` The integer may be on the same line as the double. `123 2.3` – donkon Feb 09 '17 at 04:18
Excellent, this is **exactly** what I was looking for. Thank you! Marking as answer. – Tyler Poland Feb 09 '17 at 04:20
@donkon In which case, you could use a `split("\\s+")` and parse it; or use a parser generator if you need a more formal grammar. – Elliott Frisch Feb 09 '17 at 04:22
@ElliottFrisch That's a lot of code. All you have to do is change the `int i =` line. The rest can stay. – donkon Feb 09 '17 at 04:23

Better way to read nextLine

1 Answers1