Reading and checking multiple strings from user input

Question

Scanner in = new Scanner(System.in);   

      String err = "\nThat's not a card color!\n\n";

 System.out.print("Is your card red, green or blue? ");
    String card = in.nextLine();
        if ((!"red".equals(card))){
            System.out.print(err);
             System.exit(0);
        }

The user has to input a string that equals either 'red', 'green', or 'blue'. I have it working fine for just 'red', but how do I have it check MULTIPLE strings?

Thank you all! It is now working. Sorry I am kind of new to Java. I tried an else if before but now that the

    System.out.print(err);
    System.exit(0);

is in an else statement it is working perfectly!

Loktopus · Accepted Answer · 2014-05-03 05:08:15Z

3

Make an array of Strings you want to check and then iterate over it, like this:

boolean foundColor = false;
for(String color:new String[]{"red","green","blue"}){
    if (color.equals(card)){
        foundColor = true;
    }
}
if(!foundColor){
    System.out.print(err);
    System.exit(0);
}

edited May 3, 2014 at 5:08

answered Jan 25, 2014 at 22:18

Loktopus

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2 Comments

Njol Over a year ago

This will actually print the error regardless of the input because no string can be red, green, and blue at the same time.

Loktopus Over a year ago

@Njol You're absolutely correct. Silly mistake on my part. Just corrected it.

Njol · Accepted Answer · 2014-01-25 22:41:46Z

1

Here's a one-liner if you want to make your code more concise:

if (!Arrays.asList("red", "green", "blue").contains(card)) {
    System.out.print(err);
    System.exit(0);
}

answered Jan 25, 2014 at 22:41

Njol

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Comments

Martijn Courteaux · Accepted Answer · 2014-01-25 22:16:58Z

0

Consider:

If "red", else if "green" else if "blue", else print "wrong!"

answered Jan 25, 2014 at 22:16

Martijn Courteaux

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1 Comment

user3236283 Over a year ago

Thanks but I have already tried putting it in an 'else if' statement. Oh, so put the wrong in an else and do not include a '!' It worked! Many thanks kind sir!

Christian O. · Accepted Answer · 2014-01-25 22:17:11Z

0

what you do is to check if the card is red if its not red the input is wrong, but what you want to do is check for every color and if after all the input matches no string you print the error.

so just go like

if(card.equals("red")){
 ... do something
}
else if( card.equals("blue"){
 ... do something else
}
else
  error

answered Jan 25, 2014 at 22:17

Christian O.

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