Chapter 7, Problem 20PP

Program Plan Intro

Cloud of circles

Program plan:

• In a file “Cloud.java”, import necessary packages and create a class “Cloud”,
  • Declare “ArrayList” object.
  • Initialize the variable.
  • Define the constructor,
    • Create “ArrayList”.
  • Define a method “add()”,
    • Call the method “add()” .
  • Define a method “draw()”,
    • Create a loop,
      • Create object for “Ellipse2D”.
      • Call the method “draw()”,
• In a file “CloudViewer.java”, import necessary packages and create a class “CloudViewer”,
  • Define the method “main()”,
    • Create the object for “JFrame”.
    • Declare and initialize the frame width and height.
    • Set the frame size.
    • Set the frame title.
    • Set the operation on frame.
    • Create object for “JComponent”,
      • Define the method “paintComponent()”,
        • Construct an object for “Graphics2D”.
        • Construct an object for “Cloud”.
        • Construct an object for “Random”.
        • Initialize the necessary variables.
        • Create a loop,
        • • Compute “x1” value.
          • Compute “y1” value.
          • Call the method “add()”.
        • Call the method “draw()”.
        • • • Add the component to the frame.
            • Make the frame visible.