Lab10

Problem: Work Assignment

Many students in 16ss have registered for the iShamrock Software Competition.

To have a better performance in this competition, we have to organize an effective team and set milestones for the team project.

You are required to design 3 classes:

Student

Student is a class providing basic information of a student, including his or her name, role in the team, and latest deadline. This class also provides neccessary methods (getter/setter). To simplify this problem, you don't need to design the class and you can use the Student.java provided by TA.

• DO NOT MODIFY ANY CODE IN Student.

Developer

Developer is a class which extends Student. You should override setDeadline() and toString() methods in its parent class. In addtition, as the developer programs in a specific language, you should define a field named language and corresponding getter and setter in the Developer class.

Designer

Designer is a class which extends Student. You should override setDeadline() and toString() methods in its parent class.

Guideline

We use Designer as an example to illustrate some key points in this lab.

• Extends

  To implement the inheritance of class, we use keyword extends in the definition of a class. Below is an example:

public class Designer extends Student {}

• Override

  We can design a method with the same name, return value and argument list in the child class. And we usually use an annotation @Override to imply the usage. For example:

  @Override
  public String toString() {
  	return this.name + " is a " + this.role;
  }

• Class Date

  The class Date represents a specific instant in time, with millisecond precision. We create an instance of Date using the following constructor.

  Date(int year, int month, int date)

  For more information, you can click on this link.

Tasks

1. Finish the design of Developer and Designer.

2. Finish the Test.java to output the information of 5 developers, 2 designers, and a normal student.

   The information should include every field in this class. For example:

   Jun is a Developer using Java and has a deadline on 2017-01-07.

   You can use a different format or expression, but must cover all the information.

3. • Compare the results of toString() in three classes, and explain the differences.
   • Please explain your understanding on inheritance.
   • Please explain your understanding on the keywords private, public, protected and super.

Hint: toString() is a method in the class Object , which is the parent class of all the classes.

Upload & Deadline

• Task 1 and 2 should be finished on Tuesday, and uploaded to FTP no later than 11/29/2016 23:59:59 (UTC+8).
• Task 3 is a .txt file with your student number. Please upload them to FTP no later than 11/30/2016 23:59:59 (UTC+8).

Project Task: Think in Object

Please reconstruct your project based on object-oriented programming. You should take the following things into consideration:

1. what can be a class in this project, and what are the inheritance relationships between classes.
2. how to simplify your code using method.