In-class exercise: Methods
October 3, 2008
Description
The purpose of this exercise is to give you some practice in writing methods in classes.Download StudentStats.java and
Student.java. Make sure they are both
in the same directory on your computer. Read through both files and try to
understand what is happening. Note that StudentStats.java contains a main
method and is the main program that will be run. Try to compile both files. You will
get some compiler errors. Your goal is to fix Student.java so that it is error-free.
Once you have fixed the errors, you can recompile both files and run the program
(make sure you are in the StudentStats.java window when you try to run the program).
There are five things that you will be required to do. For the first four items,
follow the getName and setName methods as examples. Note
that all of the instance variables in the class Student are declared as
private. This means that you cannot directly access these variables
from outside the class Student (for example, if you have an object of
type Student named jack you cannot write jack.major).
The methods, however, are all declared public.
Fill in the code for the getMajor method in Student.java.
Fill in the code for the setMajor method in Student.java.
Fill in the code for the getAge method in Student.java.
Fill in the code for the setAge method in Student.java.
Write the code for the increaseYear method in Student.java.
increaseYear method. Look at the code at the bottom of StudentStats.java
to see how the increaseYear method is being called (the code is
currently commented out). Note: after you write your
increaseYear method, uncomment the code at the bottom of
StudentStats.java to test your increaseYear method. Reference pp.
243-249 (4th edition) or 262-267 (5th edition) if you have any questions.
This exercise will not be graded. We will discuss it later. You are welcome to work in groups, but make sure you understand the concepts. Ask questions if you are having trouble.