Why can't my 2nd If then statement match?

Question

First of all I am new to this site, but anyways, here is my problem. In my if then statement, I type in "Gen" and it works, but if I type "Launch nuke" or "launch nuke" or "Who am I?" it just ends up saying "Unknown Command" which means it doesn't match any of the statements (or whatever it's called). I tried using == as well but they both don't work. Of course I type Gen first and the Launch nuke after. Here is the code:

import java.util.Scanner;
public class testing {
    public static void main(String[] args) {

        String alpha;
        String bravo;
        String charlie;
        Scanner input = new Scanner(System.in);         
        System.out.print("Please confirm identity: ");
        alpha = input.next();

        if (alpha.equals("Gen")) {
            System.out.println("Hello General"); 
            System.out.println("Identity Confirmed");
            System.out.print("Please input command: "); 
            bravo = input.next();

            if (bravo.equals("Launch nuke")) {                          
                System.out.println("Launching Missiles"); 
            }   

            else if (bravo.equals("launch nuke")) {
                System.out.println("Launching Missiles");
            }

            else if (bravo.equals("Who am I?")) {
                System.out.print("You are the General");
            }   

            else
                System.out.print("Unknown Command");
        }

        else
            System.out.println("Access Denied");                    
    }
}

As an aside, to save you having multiple conditions to deal with case sensitivty try invoking the `toLowerCase()` method on your input `string` — Scott, Jul 16 '15 at 08:34
@Scott `String.equalsIgnoreCase()` seems a little more reasonable in this situation if you ask me. — Dragondraikk, Jul 16 '15 at 08:37

score 3 · Answer 1 · edited Jul 29 '15 at 15:20

3

You are using input.next(). It will read only one complete word for eg: "Launchnuke". The next() method will split it to string[] with space.

So try using input.nextLine(), it should work.

edited Jul 29 '15 at 15:20

Genhis

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answered Jul 16 '15 at 08:52

Naveen

366
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12

score 2 · Accepted Answer · answered Jul 16 '15 at 08:43

2

input.nextLine() instead of input.next() should fix it. Use it for both, alpha and bravo. input.next() only takes the next token into account (like "launch"), while your commands have more than one.

answered Jul 16 '15 at 08:43

dly

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score -3 · Answer 3 · answered Jul 16 '15 at 08:19

-3

Oh I don't have enough reputation.. anyway. you should type Gen first and Launch nuke or any thing to do that because your Launch nuke if statement is inside Gen if statement

answered Jul 16 '15 at 08:19

user2257636

37
8

1

you are having this problem http://stackoverflow.com/questions/19509647/scanner-doesnt-see-after-space-java – user2257636 Jul 16 '15 at 08:29

Why can't my 2nd If then statement match?

3 Answers3