Activity 6.1 - Constructing a frame with buttons using BorderLayout

Topic

In this activity we display a frame with buttons arranged using BorderLayout, which is the default layout for a JFrame.

Here is a picture of what the frame will look like.

Task

The task is to display a frame with the following attributes:

• Its top left-hand corner is to be at screen location (200, 200). (The default position of the frame would be at (0, 0), with its top left corner at the top left of the computer screen.)
• Its dimensions are to be 210 x 297, in proportion to a page of A4 paper.
• The title is to be "A4 Page".
• The frame is to have buttons at the top, bottom, left and right, corresponding to the margins of the page. The text of the buttons is to be "Top", "Bottom", "Left", "Right" respectively.

You will need to write a Java class to the following outline:

Imports

AWT and Swing.

Inheritance

Extends JFrame.

Instance variables

Four fields of type JButton to represent the buttons.

Constructor

Takes a single String argument used to set the title of the frame.

• Sets the title.
• Sets the size to 210 x 297.
• Positions the top left-hand corner of the frame at screen location (200, 200). This can be done using the method setLocation(int x, int y).
• Creates JButton instances with text "Top", "Bottom", "Left" and "Right" and assigns them to the corresponding instance variables.
• Gets the content pane of the frame.
• Adds the four buttons to the content pane, in the positions North, South, West and East.

Instructions

1. Select File|New Project Next> and create a new Java application called MyEx6_1. In the New Java Application wizard name the project MyEx6_1 and set the Project Location to C:\M257\Unit 6. Change the name of the Main Class to myex6_1.FrameDemo1Test.
   
   



2. Add a new Java class called FrameDemo1 to the project in the same package. Write the code for this class so that it meets the specification above.
3. Now complete the main class FrameDemo1Test so it will:
   • Create a new instance of FrameDemo1 with the title "A4 Page";
   • Make the new frame visible.
4. Run the project to test your code.
5. Our sample solution appears in the Solution file.