HW3: Bruin

Homework 3: Bruin

Assigment

This is an easy hw. You are going to write several classes.

Date.java: represents a date.
Bruin.java : represents everyone in UCLA , including employee and students.
Student.java: represents a UCLA students.
Professor.java: represents a UCLA professors.

You should use this or super to simplify your program. If your program is unnecesary long, points will be taken off.
Here are all the classes

Date.java

private int year: year of the Date
private int month: month
private int day, day.
public Date(int year, int month, int day)
public int getDay()
public int getMonth()
public int getYear()
public String toString(): return the date is yyyy/mm/dd format. Example, if the date is 1991 Mar 23, the output should be 1999/03/23.

You can have other private members.
Here is a sample test program
DateTest.java

public class DateTest {
    public static void main(String[] args) {
        Date date = new Date(2003, 1, 30);
        System.out.println(date.getYear());
        System.out.println(date.getMonth());
        System.out.println(date.getDay());
        System.out.println(date);
        
        date = new Date(2003, 11, 9);
        System.out.println(date.getYear());
        System.out.println(date.getMonth());
        System.out.println(date.getDay());
        System.out.println(date);
    }
}

Output

Bruin.java

protected String ID : 9-digit ID
protected String name: name
protected char gender : gender, M or F
protected Date birthday : Date of birth
protected Date firstDay : first day in school
public Bruin(String ID, String name, char gender, Date birthday, Date firstDay): constructor
String toString() : see the sample output for the format

You can have other private members.
BruinTest.java

public class BruinTest {
    public static void main(String[] args) {
        Date bday = new Date(1980,2,23);
        Date firstDay = new Date(2003, 9, 30);
        Bruin bruin = new Bruin("123123235", "Helen Smith", 'F', bday, firstDay);
        System.out.println(bruin);
    }
}

Output

ID: 123123235
Name: Helen Smith
Gender: F
Date of birth: 1980/02/23
In UCLA since: 2003/09/30

Student.java

The class extends Bruin. In addition to all the members given in Bruin, the class has information about all the UCLA classes that the student took and all the grades

public Student(String ID, String name, char gender, Date birthday, Date firstDay): constructor.
public void addClass(String classID, int units, String grade) : add a UCLA class with given classID, units and grade to the student's class list. e.g addClass("PIC10A", 5, "A-"). If the classID already exists in the student's class list, replace the original unit and grade by the new unit and grade.
int getTotalUnits(): get the total units

double getGPA(): return the GPA of the students. Return 0 if there is no class.Here is a function that you can use

    private double getPoints(String grade) {
        if(grade.equals("A+")) {
            return 4;
        } else if (grade.equals("A")) {
            return 4;
        } else if (grade.equals("A-")) {
            return 3.7;
        } else if(grade.equals("B+")) {
            return 3.3;
        } else if(grade.equals("B")) {
            return 3;
        } else if(grade.equals("B-")) {
            return 2.7;
        } else if(grade.equals("C+")) {
            return 2.3;
        } else if(grade.equals("C")) {
            return 2.0;
        } else if(grade.equals("C-")) {
            return 1.7;
        } else if(grade.equals("D+")) {
            return 1.3;
        } else if(grade.equals("D")) {
            return 1;
        } else {
            return 0;
        }
    }

String toString() : see the same output.

You can have as many private variables as you like.
StudentTest.java

public class StudentTest {
    public static void main(String[] args) {
        Date bday = new Date(1980,2,23);
        Date firstDay = new Date(2003, 9, 30);
        Student s = new Student("123123235", "Helen Smith", 'F', bday, firstDay);
        System.out.println("getTotalUnits(): " + s.getTotalUnits());
        System.out.println("getGPA(): " + s.getGPA());
        System.out.println();
        System.out.println(s);
        s.addClass("PIC10A", 5, "A-");
        s.addClass("PIC10B", 5, "B+");
        s.addClass("PIC20A", 5, "A");
        s.addClass("Math31A", 4, "C");
        System.out.println("getTotalUnits(): " + s.getTotalUnits());
        System.out.println("getGPA(): " + s.getGPA());
        System.out.println();
        System.out.println(s);
    }
}

Output

getTotalUnits(): 0
getGPA(): 0.0

ID: 123123235
Name: Helen Smith
Gender: F
Date of birth: 1980/02/23
In UCLA since: 2003/09/30
Class taken:
Total units: 0
GPA: 0.0

getTotalUnits(): 19
getGPA(): 3.32

ID: 123123235
Name: Helen Smith
Gender: F
Date of birth: 1980/02/23
In UCLA since: 2003/09/30
Class taken:
PIC10A  5       A-
PIC10B  5       B+
PIC20A  5       A
Math31A 4       C
Total units: 19
GPA: 3.32

StudentTest2

public class StudentTest2 {
    public static void main(String[] args) {
        Date bday = new Date(1984,2,23);
        Date firstDay = new Date(2004, 9, 30);
        Student s = new Student("144244422", "Mary Ford", 'F', bday, firstDay);
        s.addClass("PIC10A", 5, "C-");
        s.addClass("PIC10B", 5, "B");
        System.out.println(s);
        s.addClass("PIC10A", 5, "A") ; // replace the grade of PIC10A
        System.out.println(s);
    }
}

Output

ID: 144244422
Name: Mary Ford
Gender: F
Date of birth: 1984/02/23
In UCLA since: 2004/09/30
Class taken:
PIC10A  5       C-
PIC10B  5       B
Total units: 10
GPA: 2.35

ID: 144244422
Name: Mary Ford
Gender: F
Date of birth: 1984/02/23
In UCLA since: 2004/09/30
Class taken:
PIC10A  5       A
PIC10B  5       B
Total units: 10
GPA: 3.5

Professor.java

The class extends Bruin. It has the following variables:

public int position: whether the professor is assistant, associate or full time professor. It can be one of the following variables:
public static final int ASSISTANT, ASSOCIATE, FULL.
Professor(String ID, String name, char gender, Date birthday, Date firstDay, int position): constructor
public int getSalary(): return the salary of the professor. It is calculated by the following method:
1. The basic salary for assistant, associate and full time professor are 100000, 200000,300000 respectively.
2. Every year the professor get 5% raise.
3. You assume the currect date is 2004 June 1st.
4. e.g If the first day of an assistant professor is 2001 April 1st, then his currect salary is 100000*(1+0.05) to the power 3. If the first day of an assiant professor is 2001 July 10, then his currect salary is 100000*(1+0.05) to the power 2.
String toString(): see the sample output.

You can have other private variables.
ProfTest.java

public class ProfTest {
    public static void main(String[] args) {
        Date bday = new Date(1955,2,23);
        Date firstDay = new Date(1997, 10, 8);
        Professor prof  = new Professor("123123235", "Dava Johnson", 'M', bday, firstDay, Professor.ASSOCIATE);
        System.out.println(prof);
         firstDay = new Date(1997, 1,1);
        prof  = new Professor("123123235", "Dava Johnson", 'M', bday, firstDay, Professor.ASSOCIATE);
        System.out.println(prof);
    }
}

Output

ID: 123123235
Name: Dava Johnson
Gender: M
Date of birth: 1955/02/23
In UCLA since: 1997/10/08
Position: Associate Professor
Salary: 268019

ID: 123123235
Name: Dava Johnson
Gender: M
Date of birth: 1955/02/23
In UCLA since: 1997/01/01
Position: Associate Professor
Salary: 281420

Hint

To print out gpa in 2 decimal places formula, I use
```
(int)(x*100 + 0.5)/100.0
```
I use "\t" (tab) in the Student's toString() method to seperate data

What to submit

Call your source code file Date.java, Bruin.java, Student.java, Professor.java. Put this file in your submit folder. Do not place this file inside another folder within your submit folder.

Remark

All source code submitted must contain the following information at the beginning of each file:
- Your full name
- Your student ID number
- Your PIC login ID
- Your e-mail address
- Your discussion section number and TA's name
- The assignment number and description
- Honesty pledge
Properly formatted, this information should appear as follows:(Please change the Name, Student ID, PIC ID, E-mail, Discussion
```
/** Name:        Charles Li 
  * Student ID : 000 000 000   
  * PIC ID:      ccli 
  * E-mail:      ccli@math.ucla.edu 
  * Discussion:	 1A
  * Assignment:	 hw1 
  * 
  * I, Charles Li, pledge that this is my own independent work, which  
  * conforms to the guidelines of academic honesty as described in the course  
  * syllabus.  
  * 
  */
```
If you develop your program on your home computer, make sure it compiles and runs on the lab machines before you turn it in.
Please use consistent and neat indenting in all your programs.
Please comment your program.

Solution

Date.java, Bruin.java, Student.java, Professor.java