AreaCalculator.java

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package areacalculator;
import javax.swing.*;

/**
 *
 * @author kkmungai
 */
public class AreaCalculator {
    private double area;

    /**
     * @param args the command line arguments
     */
    
    public int getChoice() {
        int choice = 0;
        while (choice <= 0 || choice > 4) {
            choice = Integer.parseInt(JOptionPane.showInputDialog("Enter \n1. Circle \n2. Rectangle \n3. Triangle \n4. Exit"));
        }
        return choice;
    } 
    
    public double getInput(String neededInput) {
        double s = Double.parseDouble(JOptionPane.showInputDialog(neededInput));
        return s;
    }
    
    private void displayResult(String output) {
        JOptionPane.showMessageDialog(null ,output);
    }
    public static void main(String[] args) {
        // TODO code application logic here
        
        AreaCalculator myDemo = new AreaCalculator();
        int choice = myDemo.getChoice();
        if (choice == 1) {
            double radius = myDemo.getInput("Enter the radius");
            myDemo.area = Math.Pi * radius * radius;
            myDemo.displayResult("The area of the Circle is : " + myDemp.area);
        } else if (choice == 2) {
            double sidA = myDemo.getInput("Enter side a");
            double sidB = myDemo.getInput("Enter side b");
            dou
        }
    }
    
}