(Java) Switch/Case With Enter

Question

I need help with switch, here is my part of my code that I need help with.

Scanner kb = new Scanner(System.in);
do
    {
        System.out.println("\nAt each turn, type: ");
        System.out.println("P to print");
        System.out.println("M to mix (shuffle the cards)");
        System.out.println("S to save");
        System.out.println("Q to quit");
        System.out.println("Just ENTER to play a turn");

        meun = kb.nextLine();


        switch (meun)
        {
            case ("P"):
            case ("p"):     System.out.println("\nPlayer1 cards: " + p1.toString());
//More Codes...
            case (//Would like to have an ENTER here.):

How do I just get an "enter" in the next case after P. What I want is that if the user just hit enter then the program will play another turn. I was thinking about doing String.valueOf(kb.nextLine()) but that does not work.

Thank you for your help.

Did you tried with ASCII value (13) ? – Gangaraju Mar 04 '16 at 03:09 — Gangaraju, Mar 04 '16 at 03:09

score 4 · Accepted Answer · answered Mar 04 '16 at 02:53

4

In your case, you should check for en empty string since, Just enter will actually return an empty string to Scanner.nextLine().

    switch (meun)
    {
    case "":
         // Next turn.
    }

answered Mar 04 '16 at 02:53

Codebender

14,221
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goncalopinto · Answer 2 · 2016-03-04T10:10:42.437

2

Just use an empty string, like:

case "" : System.out.println("Blah, blah, blah...");

Or change "" to KeyCodes.KEY_ENTER or just 13 should work. And change the input from a String to a char.

edited Mar 04 '16 at 10:10

answered Mar 04 '16 at 02:54

goncalopinto

433
2
8

ahe · Answer 3 · 2016-03-04T02:57:55.117

1

For console input, hitting enter sends your command to standard input and is also not a character that you could put in a switch. For your situation it's probably easiest to use another character like t to play a turn.

If you were to implement a key listener it would be possible to detect the enter key as an input, but that seems like it would be overkill for your program's needs.

EDIT: the other answerers have helpfully provided much more useful answers!

edited Mar 04 '16 at 02:57

answered Mar 04 '16 at 02:50

ahe

227
1
7

I wish that were the case. But for this program, my professor wants us to implement an enter key. – Paincakes Mar 04 '16 at 02:53
Perhaps try [this](http://stackoverflow.com/questions/18281543/java-using-scanner-enter-key-pressed). – ahe Mar 04 '16 at 02:54

(Java) Switch/Case With Enter

3 Answers3