Java program takes input twice

Question

So below is my code. I'm trying to use the Scanner class to read an input from the console, and then print out each token on a separate line. But there's a small problem where the user has to input twice. An example of what happens is given below the code

import java.util.Scanner;

public class StringSort {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter a string: ");

        String str = scanner.nextLine();

        int i = 0;
        while (i< str.length()) {
            i++;
            System.out.println("" + scanner.next());
        }
        scanner.close();
    }
}

Example:

Enter a string: 
what is love
what is love
what
is
love

Please fix your indentation and clarify your question, what did you expect? — Elliott Frisch, Dec 12 '18 at 01:42

score 2 · Answer 1 · answered Dec 12 '18 at 01:41

To do what you want use the Scanner class to read an input from the console, and then print out each token on a separate line you can use the String::split method

String str = scanner.nextLine();
String [] arr = str.split (" ");
for (String x : arr) {
    System.out.println (x);
}

score 0 · Accepted Answer · answered Dec 12 '18 at 02:37

0

A more efficient implementation of the above code would be as follows:

    Scanner sc = new Scanner(System.in);

    while (sc.hasNext()) {
        System.out.println(sc.next());
    }

This would avoid use of extra space as done by @ScaryWombat

answered Dec 12 '18 at 02:37

paradocslover

1,737
1
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score 0 · Answer 3 · answered Dec 19 '18 at 05:29

0

Scanner should be propertly closed:

try (Scanner sc = new Scanner(System.in)) {
    while (sc.hasNext()) {
        System.out.println(sc.next());
    }
}

answered Dec 19 '18 at 05:29

oleg.cherednik

12,764
2
17
25

Java program takes input twice

3 Answers3