CODEWITHSUNDEEP
javastringfindspace
Filipp Maksimov
Filipp Maksimov

Reputation: 117

indexOf for space in string

There is a space in the string, but when I run program, it returns -1, that means there aren't spaces in the string Here's the code:

import java.util.Scanner;


public class Main {

     public static void main(String[] args) {
         Scanner scan = new Scanner(System.in);
         String s = scan.next();
         System.out.println(s.indexOf(' '));
    }

}

Upvotes: 10

Views: 56458

Answers (5)

F M
F M

Reputation: 35

Use scan.nextLine() because scan.next() will read until it encounters a white space (tab, space, enter) so it finish getting when it see space. You yourself could guess this by printing s, too! be successful!

Upvotes: 1

Balaswamy Vaddeman
Balaswamy Vaddeman

Reputation: 8530

this perfectly works fine for me.

System.out.println("one word".indexOf(' '));

This is because of Scanner next method. check this

Upvotes: 6

Peter Lawrey
Peter Lawrey

Reputation: 533492

Try

String s = scan.nextLine();

as scan.next() gets the next "word" which can't contain spaces.

Upvotes: 3

Anthales
Anthales

Reputation: 1148

Scanner reads text seperated by whitespace, which can be a line break but also a space character. This is why scan.next() will return a String with no spaces. If you need line breaks instead, use scan.nextLine()

Upvotes: 3

Mat
Mat

Reputation: 206689

Scanner.next() returns the next token in the input, and by default, tokens are whitespace separated. i.e. s is guaranteed not to contain spaces.

Maybe you meant String s = scan.nextLine();?

Upvotes: 12

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