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Java 5 - Interactive Terminal & Java Poker Game

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By Ndimofor Aretas 9 min read

Interactive Terminal

  • The Scanner class is used to get user input, and it is found in the java.util package.
  • We can use the Scanner class to get user input in the following way:
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import java.util.Scanner;  // Import the Scanner class

public class MyClass {
    public static void main(String[] args) {
        Scanner myObj = new Scanner(System.in);  // Create a Scanner object
        System.out.println("Enter username");

        String userName = myObj.nextLine();  // Read user input
        System.out.println("Username is: " + userName);  // Output user input
    }
}

  • The nextLine() method is used to read Strings, and the nextInt() method is used to read integers. nextDouble() is used to read doubles.

  • In order to avoid memory leaks, we should close the Scanner object after use.

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import java.util.Scanner;  // Import the Scanner class

public class MyClass {
    public static void main(String[] args) {
        Scanner myObj = new Scanner(System.in);  // Create a Scanner object
        System.out.println("Enter username");

        String userName = myObj.nextLine();  // Read user input
        System.out.println("Username is: " + userName);  // Output user input
        myObj.close();  // Close the Scanner object
    }
}

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import java.util.Scanner;

public class Survey {
    public static void main(String[] args) {

        //*********PART A: PICKING UP THE USER'S ANSWERS*********
        System.out.println("Welcome. Thank you for taking the survey");

        Scanner scanner = new Scanner(System.in);
        int counter = 0;

        System.out.println("\nWhat is your name?");
        String name = scanner.nextLine();
        counter++;

        System.out.println("\nHow much money do you spend on coffee?");
        double coffeePrice = scanner.nextDouble();
        counter++;

        System.out.println("\nHow much money do you spend on fast food?");
        double foodPrice = scanner.nextDouble();
        counter++;


        System.out.println("\nHow many times a week do you buy coffee?");
        int coffeeAmount = scanner.nextInt();
        counter++;

        System.out.println("\nHow many times a week do you buy fast food?");
        int foodAmount = scanner.nextInt();
        counter++;

        scanner.close();

        //*********PART B: RESPONDING TO THE USER**********
        //System.out.println("Thank you <name> for answering all <counter> questions");
        System.out.println("\nThank you " + name + " for answering all " + counter + " questions");
        //System.out.println("Weekly, you spend $<totalPrice> on coffee");
        System.out.println("Weekly, you spend" + " €"+ (coffeePrice * coffeeAmount) + " on coffee");
        //System.out.println("Weekly, you spend $<totalPrice> on food");
        System.out.println("Weekly, you spend" + " €"+ (foodPrice * foodAmount) + " on food");

    }
}

The Java Poker Game

  • This game incoporates the use of functions, loops, conditionals, and the previous concepts we have learned.

The Game

  • The game is a simple poker game that runs in the terminal.
  • The game is played between the user and the computer.
  • The computer generates a random number between 1 and 13, picks a random suit, and displays the card for both the user and the computer.
  • The dealer asks the user to draw 5 cards.
  • Each time a matching card is drawn, the user or the computer gets a point.
  • The player with the most points wins the game.

The tasks

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    /** Task 1
     * create a function that returns a random card
     * Function name – randomCard
     * @return (String)
     *
     * Inside the function:
     *   1. Gets a random number between 1 and 13.
     *   2. Returns a card that matches the random number (get the String values from cards.text).
     */

      /*Task 2: Explain the rules

        >>Let's play Pokerito. Type anything when you're ready.
        |
        >>It's like Poker, but a lot simpler.
        >> (new line)
        >> • There are two players, you and the computer.
        >> • The dealer will give each player one card.
        >> • Then, the dealer will draw five cards (the river)
        >> • The player with the most river matches wins!
        >> • If the matches are equal, everyone's a winner!
        >> (new line)
        >> • Ready? Type anything if you are.
        |
        */

      /*Task 3: Present the user with a card
         println 'Here's your card:'
         <show card>
         <new line>
         println 'Here's the computer's card:'
         <show computer's card>
        */


        /** Task 4 - Draw five cards
         *
         * • print:  Now, the dealer will draw five cards. Press enter to continue.
         * • The dealer will draw a card every time the user presses enter.
         * • Before you draw a card, print the order it was drawn in:
         *      Card 1
         *      <2 new lines>
         *      <print card>
         *      Card 2
         *      <2 new lines>
         *      <print card>
         *      ...
         */

        /** Task 5 - Get the winner
         *
         * • Count your number of matches.
         * • Count the computer's number of matches.
         * • print: Your number of matches: <yourMatches>
         * • print: Computer number of matches:  <computerMatches>
         *
         * • If you have more matches, print: You win!.
         * • If the computer has more matches, print: The computer wins!
         * • If the matches are equal, print: everyone wins!.
         */

The Solution

  • Task 1:
    • Function name – randomCard that returns a String.
    • Inside the function:
      • Gets a random number between 1 and 13.
      • Return a card that matches the random number (get the String values from cards.text).
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public static String randomCard() {
    double randomNum = Math.random() * 13 + 1;
    int randomInt = (int)randomNum;

    switch (randomInt){
        case 1:
            return "   _____\n"+
                   "  |A _  |\n"+
                   "  | ( ) |\n"+
                   "  |(_'_)|\n"+
                   "  |  |  |\n"+
                   "  |____V|\n";
        case 2:
            return  "   _____\n"+
                    "  |2    |\n"+
                    "  |  o  |\n"+
                    "  |     |\n"+
                    "  |  o  |\n"+
                    "  |____Z|\n";
        case 3:
            return  "   _____\n" +
                    "  |3    |\n"+
                    "  | o o |\n"+
                    "  |     |\n"+
                    "  |  o  |\n"+
                    "  |____E|\n";
        case 4:
            return  "   _____\n" +
                    "  |4    |\n"+
                    "  | o o |\n"+
                    "  |     |\n"+
                    "  | o o |\n"+
                    "  |____h|\n";
        case 5:
            return  "   _____\n" +
                    "  |5    |\n"+
                    "  | o o |\n"+
                    "  |  o  |\n"+
                    "  | o o |\n"+
                    "  |____S|\n";
        case 6:
            return  "   _____\n" +
                    "  |6    |\n"+
                    "  | o o |\n"+
                    "  | o o |\n"+
                    "  | o o |\n"+
                    "  |____9|\n";
        case 7:
            return  "   _____\n" +
                    "  |7    |\n"+
                    "  | o o |\n"+
                    "  |o o o|\n"+
                    "  | o o |\n"+
                    "  |____L|\n";
        case 8:
            return  "   _____\n" +
                    "  |8    |\n"+
                    "  |o o o|\n"+
                    "  | o o |\n"+
                    "  |o o o|\n"+
                    "  |____8|\n";
        case 9:
            return  "   _____\n" +
                    "  |9    |\n"+
                    "  |o o o|\n"+
                    "  |o o o|\n"+
                    "  |o o o|\n"+
                    "  |____6|\n";
        case 10:
            return  "   _____\n" +
                    "  |10  o|\n"+
                    "  |o o o|\n"+
                    "  |o o o|\n"+
                    "  |o o o|\n"+
                    "  |___J |\n";
        case 11:
            return  "   _____\n" +
                    "  |J  ww|\n"+
                    "  | o {)|\n"+
                    "  |o o% |\n"+
                    "  | | % |\n"+
                    "  |__%%[|\n";
        case 12:
            return  "   _____\n" +
                    "  |Q  ww|\n"+
                    "  | o {(|\n"+
                    "  |o o%%|\n"+
                    "  | |%%%|\n"+
                    "  |_%%%O|\n";
        case 13:
            return  "   _____\n" +
                    "  |K  WW|\n"+
                    "  | o {)|\n"+
                    "  |o o%%|\n"+
                    "  | |%%%|\n"+
                    "  |_%%%>|\n";
        default:
            return "This should never happen.";
    }
}
  • Task 2:
    • Explain the rules:
      • Let’s play Pokerito. Type anything when you’re ready.
      • It’s like Poker, but a lot simpler.
      • There are two players, you and the computer.
      • The dealer will give each player one card.
      • Then, the dealer will draw five cards (the river)
      • The player with the most river matches wins!
      • If the matches are equal, everyone’s a winner!
      • Ready? Type anything if you are.
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 System.out.println("Let's play Pokerito. Type anything when you're ready.");
        scan.nextLine();
        System.out.println("It's like Poker, but a lot simpler.\n" +
                "\n" +
                "• There are two players, you and the computer.\n" +
                "• The dealer will give each player one card.\n" +
                "• Then, the dealer will draw five cards (the river)\n" +
                "• The player with the most river matches wins!\n" +
                "• If the matches are equal, everyone's a winner!\n" +
                "\n" +
                "• Ready? Type anything if you are.");
        scan.nextLine();
  • Task 3:
    • Present the user with a card
      • println ‘Here’s your card:’
      • println ‘Here’s the computer’s card:’
      • <show computer’s card>
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 String yourCard = randomCard();
        String computerCard = randomCard();

        System.out.println("Here's your card:");
        System.out.println(yourCard);
        System.out.println();
        System.out.println("Here's the computer's card:");
        System.out.println(computerCard);
  • Task 4:
    • Draw five cards
      • print: Now, the dealer will draw five cards. Press enter to continue.
      • The dealer will draw a card every time the user presses enter.
      • Before you draw a card, print the order it was drawn in:
        • Card 1
        • <2 new lines>
        • Card 2
        • <2 new lines>
        • …
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  int yourMatches = 0;
  int computerMatches =0;

 System.out.println("Now, the dealer will draw five cards. Press enter to continue.");
        scan.nextLine();

        for (int i = 1; i <= 5; i++) {
            System.out.println("Card " + i);
            System.out.println();
            System.out.println(randomCard());
            System.out.println();
            scan.nextLine();
        }
  • Task 5:
    • Get the winner
      • Count your number of matches.
      • Count the computer’s number of matches.
      • print: Your number of matches:
      • print: Computer number of matches:
      • If you have more matches, print: You win!.
      • If the computer has more matches, print: The computer wins!
      • If the matches are equal, print: everyone wins!.
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  for (int i = 1; i <= 5; i++) {
            if (yourCard.equals(randomCard())) {
                yourMatches++;
            }
            if (computerCard.equals(randomCard())) {
                computerMatches++;
            }
        }

        System.out.println("Your number of matches: " + yourMatches);
        System.out.println("Computer number of matches: " + computerMatches);

        if (yourMatches > computerMatches) {
            System.out.println("You win!");
        } else if (computerMatches > yourMatches) {
            System.out.println("The computer wins!");
        } else {
            System.out.println("Everyone wins!");
        }
Java 17, Java 5 - Interactive Terminal & Java Poker Game
java java basics interactive terminal java poker game scanner
This post is licensed under CC BY 4.0 by the author.