Lab 3: (4 points)

Edit the FrameTest class you submitted for Lesson 2. This time the application should declare 16 variables (two for each primitive data type) using proper syntax and naming conventions. Make them have appropriate values to match (and illustrate) their type. Specifically, do not let all of the numbers be something that can be automatically cast to the proper type - show their limit possibilities. Then use the System class to print out the names, types and respective values for one of each primitive data type and the Frame displayed to print out the names, types and respective values for the other 8 (also one of each).

Specifically one of each primitive data type will be seen in the console, and one of each will be seen in the Frame.
Copy the source onto your Unix account and compile the code there. Then on your web page give me a link to the source.

Lab 4: (4 points)

The provided code for this lab is here. The code is an application (GuessMyNumber.java) which prompts the user and allows the user to input a number.

Create a GuessMyNumber java class in Eclipse and copy the code into it. There are a couple of errors in the program which you should be able to fix easily.

First, fix these errors and run the program to see how it works. (Basically it just prompts the user for a number.)

Then edit it to solve the following problem:

Write a program to determine how many calories a person needs in a day to maintain their current weight.
A simple formula is that a person needs about 14 calories for each pound of weight.
Allow the user to input their weight in pounds.
Provide the user understandable output of how many calories a day they need to sustain their current weight.
Also tell them how much they would weigh in grams ( 1 pound = 453.59237 grams).

Format the number output so it is readable...from Course 1 Lesson 9:


NumberFormat nf = NumberFormat.getInstance();
nf.setMaximumFractionDigits(2);

Copy the source onto your Unix account and compile the code there. Then on your web page give me a link to the source.

This lab is a lot like Course 1 Lab 11 with three differences:
1. the kind of image can change (Circle or Rectangle)
2. it allows the user to draw the image and hence dynamically change the location, width and height
3. you should understand variables and types now so it should make more sense ;-)

The provided code for this lab is here. Create a ComputeFigure java class in Eclipse and copy the code into it. Open the ComputeFigure.java class in the editor. Run the program (as Java Applet).

The Applet opens with a circle drawn
and allows you to draw either a circle (actually oval) or a rectangle by

1. choosing either Circle or Rectangle
2. clicking in the pink area with the left mouse button, dragging with the mouse button held down, then releasing.



Your task for this lab is to provide the following information for the geometric figure drawn (whether it be a circle or rectangle):

1. area,
2. perimeter,
3. center point(x,y),
4. top left corner(x,y)

You may assume (for the ease of computation) that any oval drawn is really a circle.

Very Important:In the ComputeFigure.java file, there are three classes. You should NOT edit the MouseHandler or the ButtonHandler classes.

In fact, the only place you really need to edit is within the paint method of the ComputerFigure class.
Note that the code allows you to draw the rectangle and circle in the paint method - so the information/variables needed to calculate the required information is already there for you (x, y, width, height).
Finally, the information should be nicely formatted. For example output for the center point should be formatted as follows:
The center point is (45, 39) ... with, of course, the proper values for x and y



Note this would take some fancy concatenation work using drawString to get the ( , ) since Java does not have a format for ordered pairs. (As in Course 1 Lab 11).

Again, format your output numbers so that they are readable (particularly the circle)

Finally, other than the paint method, do not worry about how the code works for now. We will discuss it in class.