Modified version of “RectangleComponent” class Program plan: In a file “RectangleComponent.java”, Create a package. Import necessary default packages. Create a class “RectangleComponent”, Declare the necessary static variables. Declare the “Rectangle” object. Declare the necessary variables. Define the constructor, Create a rectangle. Set the x, y positions to “1”. Define the method “paintComponent()”, Call the method “paintComponent()” of super class. Create “Graphics2D” object. Call the method “draw()” to draw the rectangle. Define a method “moveRectangle ()”, Check whether the X position of rectangle is negative, If it is true, set the value to “1”. Check whether the Y position of rectangle is negative, If it is true, set the value to “1”. Check whether the maximum X position of rectangle is greater than the width, If it is true, set the value to “-1”. Check whether the maximum Y position of rectangle is greater than the width, If it is true, set the value to “-1”. Call the method “translate()” to translate the rectangle. Call the method “repaint()”. In a file “RectangleFrame.java”, Create a package. Import necessary packages. Create a class “RectangleFrame”, Declare the necessary static variables. Declare the “RectangleComponent” object. Create a class “TimerListener”, Define the method “actionPerformed()” , Call the method “moveRectangle()”. Define the constructor, Create a rectangle. Add the rectangle. Set the size. Create “ActionListener” object. Set the delay, milliseconds between the timer ticks. Call the method “start()” to start the timer. In a file “RectangleViewer.java”, Create a package. Import necessary package. Create a class “RectangleViewer”, Define the method “main()”, Create object for “RectangleFrame”. Set the title for the frame. Set the operation for the frame. Make the frame visible.

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Chapter 11, Problem 11PE

Program Plan Intro

Modified version of “RectangleComponent” class

Program plan:

In a file “RectangleComponent.java”,

Create a package.

Import necessary default packages.

Create a class “RectangleComponent”,

Declare the necessary static variables.

Declare the “Rectangle” object.

Declare the necessary variables.

Define the constructor,

Create a rectangle.

Set the x, y positions to “1”.

Define the method “paintComponent()”,

Call the method “paintComponent()” of super class.

Create “Graphics2D” object.

Call the method “draw()” to draw the rectangle.

Define a method “moveRectangle ()”,

Check whether the X position of rectangle is negative,

If it is true, set the value to “1”.

Check whether the Y position of rectangle is negative,

If it is true, set the value to “1”.

Check whether the maximum X position of rectangle is greater than the width,

If it is true, set the value to “-1”.

Check whether the maximum Y position of rectangle is greater than the width,

If it is true, set the value to “-1”.

Call the method “translate()” to translate the rectangle.

Call the method “repaint()”.

In a file “RectangleFrame.java”,

Create a package.

Import necessary packages.

Create a class “RectangleFrame”,

Declare the necessary static variables.

Declare the “RectangleComponent” object.

Create a class “TimerListener”,

Define the method “actionPerformed()” ,

Call the method “moveRectangle()”.

Define the constructor,

Create a rectangle.

Add the rectangle.

Set the size.

Create “ActionListener” object.

Set the delay, milliseconds between the timer ticks.

Call the method “start()” to start the timer.

In a file “RectangleViewer.java”,

Create a package.

Import necessary package.

Create a class “RectangleViewer”,

Define the method “main()”,

Create object for “RectangleFrame”.

Set the title for the frame.

Set the operation for the frame.

Make the frame visible.

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