Recitation 19 for CS160

Recitation R19 - Classes, Objects, Methods
Spring 2015

CS160: Foundations in Programming

The goal of this lab is:

Write a class with data and methods
Show how instance data is useful
Instantiate an array of classes
Continue to practice using file I/O

Classes, Objects, Methods

Write the following program from scratch in the following phases:

Phase 1

Create a new project in Eclipse called R19.
Import the class called Course.java.
Import the class called Student.java.
The main method in Student.java has already been completed for you.
Implement the readTranscript method to read the student's transcript from a file, as follows:
- Add a scanner to read from the file passed in.
- You will need a try-catch block for this to work.
- Here is the data file that you will read for this program: transcript.txt
- Use the nextLine() method to read each of the fields below.
- Read the first and last names and identifiers from the file, and store them in the corresponding instance variables.
- Read the number of courses from the file into an integer variable.
- Add an extra nextLine() that discards what is returned.
- Use the number of courses to allocate an array of Course objects.
- Add a for loop that reads the remaining lines of the file.
- The format is 5 lines per entry: course number, course name, semester, credit hours, and course grade.
- You must allocate a new Course object for each course, and you must put the resulting reference into the Course array.
- After reading the credit hours and course grade, add an extra nextLine() that discards what is returned.
- Store the data read from the file in the array of Course objects.
- NOTE: Even after allocating the array, you must instantiate an individual Course object (by calling the constructor) for each array element. The TA will explain why.

Phase 2

Implement the writeTranscript method to write the student transcript to the console:
```
    public void writeTranscript() { }
    
```

To write the transcript, print the student information from instance variables, then iterate the courses array, and calling toString on each Course object. After completing the loop, print the grade point average. The output for the provided file should be exactly as follows:

    Name: Chris Wilcox
    SID: 888-88-8888
    EID: sinyala

    Spring 2014, CW100, Using Google, 4.0, 3.0
    Fall 2014, CW101, Telemark Skiing, 4.0, 2.5
    Spring 2015, CW200, Whitewater Kayaking, 3.0, 4.0
    Fall 2015, CW201, Making Chai, 3.0, 4.0
    Spring 2016, CW300, Working Hard, 2.0, 2.0
    GPA: 3.125

Note: See how the student excels at important subjects!

Phase 3

Implement the gradePointAverage method to compute the grade point average of the student:
```
    public double gradePointAverage() { }
    
```
The algorithm to compute the grade point average is to accumulate the product of the course grade and credit hours for each course, then divide that number by the total number of credit hours.
This method must be called from the writeTranscript method before printing the last line of the transcript where the GPA is reported.

Submit your Student.java to the Checkin tab to get credit for this lab. Automated grading will be enabled, and your final grade will be based on your results.

Recitation R19 - Classes, Objects, Methods Spring 2015

Classes, Objects, Methods

Phase 1

Phase 2

Phase 3

Recitation R19 - Classes, Objects, Methods
Spring 2015