Chp5 Ex1, 2

Card.java

import java.util.HashMap;

public class Card {

    private String input;
    private HashMap<Integer, String> numberDictionary = new HashMap<Integer, String>();
    private HashMap<String, String> cardDictionary = new HashMap<String, String>();


    public Card(String input) {
        this.input = input;
        assignValues();
    }

    public String getDescription() {

        if (input == null) {
            return "No Input was assigned.";
        }

        String cardOutput, numberOutput;

        if (input.length() == 2) {
            cardOutput = cardDictionary.get(input.substring(1));
            numberOutput = numberDictionary.get(Integer.parseInt(input.substring(0, 1)));
        } else if (input.length() == 3) {
            cardOutput = cardDictionary.get(input.substring(2));
            numberOutput = numberDictionary.get(Integer.parseInt(input.substring(0, 2)));
        } else {
            return "Invalid Input, please try again.";
        }



        if (cardOutput == null || numberOutput == null) {
            return "Invalid Input, please try again.";
        }

        return numberOutput + " of " + cardOutput;

    }

    private void assignValues() {
        cardDictionary.put("A", "Ace");
        cardDictionary.put("J", "Jack");
        cardDictionary.put("Q", "Queen");
        cardDictionary.put("K", "King");
        cardDictionary.put("D", "Diamonds");
        cardDictionary.put("H", "Hearts");
        cardDictionary.put("S", "Spades");
        cardDictionary.put("C", "Clubs");

        numberDictionary.put(1, "One");
        numberDictionary.put(2, "Two");
        numberDictionary.put(3, "Three");
        numberDictionary.put(4, "Four");
        numberDictionary.put(5, "Five");
        numberDictionary.put(6, "Six");
        numberDictionary.put(7, "Seven");
        numberDictionary.put(8, "Eight");
        numberDictionary.put(9, "Nine");
        numberDictionary.put(10, "Ten");

    }


}

QuadraticEquation.java

public class QuadraticEquation {

    private double a, b, c;

    public QuadraticEquation(double a, double b, double c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    public double getSolution1() {
        if (Double.isNaN((-b - Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a))) {
            return 0.0;
        }
        return (-b - Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
    }

    public double getSolution2() {
        if (Double.isNaN((-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a))) {
            return 0.0;
        }
        return (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
    }

    boolean hasSolutions() {
        if (Double.isNaN(getSolution1()) && Double.isNaN(getSolution2())) {
            return false;
        }
        return true;
    }

}