Displays class Shapes - Java Object Oriented Design

Java examples for Object Oriented Design:Class

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Description

Displays class Shapes

Demo Code

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import java.awt.Graphics; //handle the display
import javax.swing.JPanel;

class Shapes extends JPanel
{
   private int choice; // user's choice of which shape to draw
   //from w  w  w  .ja  v a2s.c o m
   // constructor sets the user's choice
   public Shapes(int userChoice)
   {
      choice = userChoice;
   } 
   
   // draws a cascade of shapes starting from the top-left corner
   public void paintComponent(Graphics g)
   {
      super.paintComponent(g);
      
      for (int i = 0; i < 10; i++)
      {
         // pick the shape based on the user's choice
         switch (choice)
         {
            case 1: // draw rectangles
               g.drawRect(10 + i * 10, 10 + i * 10, 
                  50 + i * 10, 50 + i * 10);
               break;
            case 2: // draw ovals
               g.drawOval(10 + i * 10, 10 + i * 10, 
                  50 + i * 10, 50 + i * 10);
               break;
         } 
      } 
   } 
}

public class Main
{
   public static void main(String[] args)
   {
      // obtain user's choice
      String input = JOptionPane.showInputDialog(
         "Enter 1 to draw rectangle\n" +
         "Enter 2 to draw ovals");
      
      int choice = Integer.parseInt(input); // convert input to int
      
      // create the panel with the user's input
      Shapes panel = new Shapes(choice);
      
      JFrame application = new JFrame(); // creates a new JFrame

      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      application.add(panel); 
      application.setSize(300, 300); 
      application.setVisible(true); 
   }
}

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