Java-Arithmetic-Switch/Main.java at main · ethanKletschke/Java-Arithmetic-Switch · GitHub

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import javax.swing.JOptionPane;

public class Main {
    public static void main(String[] args) {
        int optDummy = 0;
        boolean isPresent = false;
        final int[] choices = {1, 2, 3, 4, 5};

        do {
            final String menu = """
                           Enter a number:
                           1) Addition
                           2) Subtraction
                           3) Multiplication
                           4) Division
                           5) Exit""";

            final int option = Integer.parseInt(JOptionPane.showInputDialog(menu));
            optDummy = option;

            for (int choice : choices) {
                if (option == choice) {
                    isPresent = true;
                }
            }

            switch (option) {
                case 1: {
                    try {
                        final double sum = addition();
                        JOptionPane.showMessageDialog(null, "The sum of the numbers you entered is: " + sum, "", 1);
                    } catch (Exception e) {
                        JOptionPane.showMessageDialog(null, "Oops! Try again!", "Error!", 0);
                        isPresent = false;
                    }

                    break;
                }

                case 2: {
                    try {
                        final double diff = subtraction();
                        JOptionPane.showMessageDialog(null, "The difference of the numbers is: " + diff, "", 1);
                    } catch (Exception e) {
                        JOptionPane.showMessageDialog(null, "Oops! Try again!", "Error!", 0);
                        isPresent = false;
                    }

                    break;
                }

                case 3: {
                    try {
                        final double mult = multiplication();
                        JOptionPane.showMessageDialog(null, "The difference of the numbers is: " + mult, "", 1);
                    } catch (Exception e) {
                        JOptionPane.showMessageDialog(null, "Oops! Try again!", "Error!", 0);
                        isPresent = false;
                    }

                    break;
                }

                case 4: {
                    try {
                        final double div = division();
                        JOptionPane.showMessageDialog(null, "The difference of the numbers is: " + div, "", 1);
                    } catch (Exception e) {
                        JOptionPane.showMessageDialog(null, "Oops! Try again!", "Error!", 0);
                        isPresent = false;
                    }

                    break;
                }

                case 5: {
                    JOptionPane.showMessageDialog(null, "Exiting...", "Leaving", -1);
                    closeProg(0);
                    break;
                }

                default: {
                    JOptionPane.showMessageDialog(null, "Try again.", "Error!", 0);
                }
            }
        } while (!isPresent);
    }

    private static double addition() throws Exception {
        final double n1 = Double.parseDouble(JOptionPane.showInputDialog("Enter the first number: "));
        final double n2 = Double.parseDouble(JOptionPane.showInputDialog(n1 + " entered.\nEnter the second number: "));
        final double sum = n1 + n2;
        return sum;
    }

    private static double subtraction() throws Exception {
        final double n1 = Double.parseDouble(JOptionPane.showInputDialog("Enter the first number: "));
        final double n2 = Double.parseDouble(JOptionPane.showInputDialog(n1 + " entered.\nEnter the second number: "));
        final double diff = n1 - n2;
        return diff;
    }

    private static double division() throws Exception {
        final double n1 = Double.parseDouble(JOptionPane.showInputDialog("Enter the first number: "));
        final double n2 = Double.parseDouble(JOptionPane.showInputDialog(n1 + " entered.\nEnter the second number: "));
        final double quotient = n1 / n2;
        return quotient;
    }

    private static double multiplication() throws Exception {
        final double n1 = Double.parseDouble(JOptionPane.showInputDialog("Enter the first number: "));
        final double n2 = Double.parseDouble(JOptionPane.showInputDialog(n1 + " entered.\nEnter the second number: "));
        final double mult = n1 * n2;
        return mult;
    }

    private static void closeProg(int exitCode) {
        System.exit(exitCode);
    }
}