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public static void main(String args[]) {
    String[] shape = { "Circle", "Square", "Oval", "Rectangle" };
    var selected = JOptionPane.showOptionDialog(null, "Enter the shape of your pizza", "Pizza Slices Calculator, 0, 3, null, shape, shape[0]);
    if (selected == 0) {
        string input = JOptionPane.showInputDialog("Enter the radius of circular pizza");
        double radius = Double.parseDouble(input);
        circle(radius);
    }
    if (selected == 1) { 
        string input = JOptionPane.showInputDialog("Enter the side of a squared pizza");
        double side = Double.parseDouble(input);
        slices = square(side);
        JOptionPane.showMessageDialog(null, "The max number of slices is: " + slices);
    }
    if (selected == 2) { 
        string input1 = JOptionPane.showInputDialog("Enter the major axis of oval pizza");
        double majorAxis = Double.parseDouble(input);
        string input2 = JOptionPane.showInputDialog("Enter the minor axis of oval pizza");
        double minorAxis = Double.parseDouble(input);
        oval(majorAxis, minorAxis);
    }
    if (selected == 3) {
        string input1 = JOptionPane.showInputDialog("Enter the length of rectangular pizza");
        double length = Double.parseDouble(input1);
        string input2 = JOptionPane.showInputDialog("Enter the width of rectangular pizza");
        double width = Double.parseDouble(input2);
        slices = rectangle(length, width);
        JOptionPane.showMessageDialog(null, "The max number of slices is: " + slices);
        
    }
}

public static void circle(double radius){
    double area = Math.pi * radius * radius;
    int slices = (int) Math.floor(area/40);
    JOptionPane.showMessageDialog(null, "The max number of slices is: " + slices);
}

public static int square(double radius){
    double area = side * side;
    int slices = (int) Math.floor(area/40);
    return slices
}

public static void oval(double majorAxis, double minorAxis){
    double area = Math.pi * majorAxis * minorAxis;
    int slices = (int) Math.floor(area/40);
    JOptionPane.showMessageDialog(null, "The max number of slices is: " + slices);
}

public static int rectangel(double length, double width){
    double area = length * width
    int slices = (int) Math.floor(area/40);
    return slices
}