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Thread: Returning Random Strings from an Array

  1. #1
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    Default Returning Random Strings from an Array

    I'm trying to construct a class named Card that will eventually deal and print a certain number of cards.

    I'm having trouble generating random strings from two arrays called suitArray and faceArray. Im trying to pass the arrays into the nextLine method, but it's not working. How can I make this work?

    import java.util.Random;
     
    class Card{
     
      String suit,face;
     
      String[] suitArray={"hearts","diamonds","clubs","spades"};
      String[] faceArray={"2","3","4","5","6","7","8","9","10","J","Q","K","A"};
     
     
      public Card(String s, String f){
        Random gen = new Random();
        s = suit.gen.nextLine(suitArray);
        f = face.gen.nextLine(faceArray); 
      }
    }


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Returning Random Strings from an Array

    The constructor is passed arguments and it builds an object based on those arguments, not the other way around. Also, String's don't have a gen field, nor is Random able to pick a random string from an array.

    Also, it doesn't make sense that you're generating a random suit and value when you're passing it to the constructor. Here's some partially-finished code that should help you write this to do what you want it to do:

    import java.util.Random;
     
    public class Card
    {
         String suit,face;
     
         String[] suitArray={"hearts","diamonds","clubs","spades"};
         String[] faceArray={"2","3","4","5","6","7","8","9","10","J","Q","K","A"};
     
         /**
          * Generates a card with a random suit and face
          **/
         public Card()
         {
              Random gen = new Random();
              // since we can access arrays via index, let's generate some random numbers for the indices
              suit = suitArray[gen.nextInt() % suitArray.length()];
              face = faceArray[gen.nextInt() % faceArray.length()];
         }
     
         /**
          * Creates a card given a suit and a face
          * @param suit
          * @param face
          */
         public Card(String s, String f)
         {
              // TODO: you're turn. What code should you put here so the Card is created correctly?
         }
    }

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    cfmonster (September 8th, 2009)

  4. #3
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    Default Re: Returning Random Strings from an Array

    I took your suggestion of:
    Random gen = new Random();
              // since we can access arrays via index, let's generate some random numbers for the indices
              suit = suitArray[gen.nextInt() % suitArray.length()];
              face = faceArray[gen.nextInt() % faceArray.length()];

    and modified it to:

    Random gen = new Random();
              // since we can access arrays via index, let's generate some random numbers for the indices
              suit = suitArray[gen.nextInt(4)];
              face = faceArray[gen.nextInt(13)];

    to make it work. Also got a few deal methods to work. Thanks for the help!

  5. #4
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    Default Re: Returning Random Strings from an Array

    Quote Originally Posted by cfmonster View Post
    I'm trying to construct a class named Card that will eventually deal and print a certain number of cards.

    I'm having trouble generating random strings from two arrays called suitArray and faceArray. Im trying to pass the arrays into the nextLine method, but it's not working. How can I make this work?

    import java.util.Random;
     
    class Card{
     
      String suit,face;
     
      String[] suitArray={"hearts","diamonds","clubs","spades"};
      String[] faceArray={"2","3","4","5","6","7","8","9","10","J","Q","K","A"};
     
     
      public Card(String s, String f){
        Random gen = new Random();
        s = suit.gen.nextLine(suitArray);
        f = face.gen.nextLine(faceArray); 
      }
    }

    Try the following code

     
    class Card{
     
      private static String[] faceArray={"2","3","4","5","6","7","8","9","10","J","Q","K","A"};
     
      public static void generateRandom(){	
    	  int minimum = 0;
    	  int maximum = 13;
    	  int randomNum = minimum + (int)(Math.random()* maximum);
          System.out.println(faceArray[randomNum]); 
      }
     
      public static void main(String[] args) {
    	  generateRandom();
      }
    }
    Last edited by vivekmk; September 8th, 2009 at 11:16 PM.

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