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(' '));
}
}
5 Answers
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();?
this perfectly works fine for me.
System.out.println("one word".indexOf(' '));
This is because of Scanner next method. check this
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()
Try
String s = scan.nextLine();
as scan.next() gets the next "word" which can't contain spaces.
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!
