Lab Manual Object Oriented Programming with JAVA (15ECSP203)

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Noreen Dorsey
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1 Lab Manual Object Oriented Programming with JAVA (15ECSP203)

2 Sl. No. Contents 1. Course Outcomes (COs) 2. List of Experiments 3. Introduction to Object Oriented Programming 4. Standard Operating Procedure 5. Java Tools 6 Procedure to Create and Execute Java Project in Eclipse IDE 7. Example for Experiments

3 Course Outcomes (COs) At the end of the course the student should be able to: 1. Apply Object Oriented Programming concepts to solve a given problem. 2. Apply design patterns to design a solution for a given problem. 3. Apply inheritance, polymorphism and exception handling mechanism to implement reusable, robust java programs. 4. Perform unit testing for an identified method/methods of a class/classes. 5. Implement user interface java programs for a given scenario. List of Experiments Sl. No. Category Topics for experiments to be conducted under each category Arrays, Strings and StringBuffer 1. Exercises Classes and Objects Inheritance and Polymorphism Runtime Error Management : Exception Handling Classes and Objects 2. Structured Enquiry Inheritance and Polymorphism Runtime Error Management : Exception Handling GUI Design and Event Handling 3. Open Ended Problem domain will be given to a group of students, which is based on the exercises of the laboratory course. Implementation has to be carried out in the laboratory.

4 Introduction to Object Oriented Programming The object oriented paradigm is built on the foundation laid by the structured programming concepts. The fundamental change in OOP (Object Oriented Programming) is that a program is designed around the data being operated upon rather upon the operations themselves. Data and its functions are encapsulated into a single entity. OOP facilitates creating reusable code that can eventually save a lot of work. A feature called polymorphism permits to create multiple definitions for operators and functions. Another feature called inheritance permits to derive new classes from old ones. OOP introduces many new ideas and involves a different approach to programming than the procedural programming. Benefits of object oriented programming Data security is enforced (Data Centric). Inheritance saves time (Reusability). User defined data types can be easily constructed. Large complexity in the software development can be easily managed. Standard Operating Procedure The Standard Operating Procedure (SOP) defines how the laboratory course is conducted for Object Oriented programming with JAVA lab and it is defined by the following steps. 1. The student has to come to lab with class notes and it is used as a ready reference for the concepts discussed in the class room. 2. The first activity for the student is to practice the class room programs (code) and verify the programs with different test cases. 3. All the students once complete the class room programs, they will be given an assignment and it is individual activity. This assignment test the ability of the student to apply the concepts taught in the class room. This assignment is guided assignment where the student is assisted on demand, in solving the problem. 4. The step 3 is optional and all the students are evaluated as per the category of experiments.

5 5. Evaluation procedure : The student has to first submit the written proposed solution for a given problem statement and it is verified (evaluated as per the rubrics) by the faculty then the student can type the code and demonstrate. Evaluation Students Assessment Through ISA (80%) + ESA (20%) Assessment Marks Internal Semester Assessment (80%) Exercises 40 Structured Enquiry 20 Open Ended and Course Activity * * Indicates marks from theory CIE. Semester End Assessment (20%) 20 TOTAL MARKS * Java Tools The students will be introduced to the following topics Introduction to the java environment Use of IDE (Eclipse) Defining simple classes and creating objects.

6 Procedure to Create and Execute Java Project in Eclipse IDE 1. Choose File New Java Project from the Eclipse menu bar, as in the following example : 2. The following window will be displayed. Enter the Project name and make sure the "Use Project folder as root for sources and class files" option is selected in the "Project layout" section as shown in the image below:

After returning to the New Project Wizard dialog box, click Finish to actually create the project you just described.

7 3. If you click the "Configure default..." link in the "Project Layout" area, you can make these settings your default settings for new projects. Select "Project" for the "Source and output folder" option and click "OK" button. We recommend that students configure Eclipse in this way. 4. After returning to the New Project Wizard dialog box, click Finish to actually create the project you just described. The following screen will be displayed, denoting a workspace with one project to choose from the Package Explorer: Note: If you forgot to close the Welcome screen (shown in the prior step), then you will not see the above window. To close the Welcome screen, click the X on the tab labeled

Welcome (towards the top left of the Eclipse window). Now you should see the workspace. 5. Congratulations, you have created your first Java project! But, we're only part way there.

8 Welcome (towards the top left of the Eclipse window). Now you should see the workspace. 5. Congratulations, you have created your first Java project! But, we're only part way there. Next comes putting some substance (code) into the project to make a working program! 6. We need to create a source file where we will write our program. Right click on the "HelloWorld" project in the Package Explorer tabbed pane on the left side of the screen and navigate to New Class, as in the following example: 7. Another window will be displayed. Then click in the text box labeled "Name:" and type in HelloWorld, as in the following example:

Now that we've completed the setup we can write the program. Enter the following text into the HelloWorld.java window. 9.

9 Click Finish. This step will create a new file named HelloWorld.java and add it to the project for you. It will also open a tabbed window where you can edit the HelloWorld.java source file. 8. Now that we've completed the setup we can write the program. Enter the following text into the HelloWorld.java window. 9. Go to the left Package Explorer pane. The HelloWorld folder should be opened, but if it is not, double click on folder to open it. Then, double click on the "(default package)" to

10 access thehelloworld.java file. Right click on the file and select Run As Java Application. Example for Experiments 1. Design java application to model Employee of an ABC organization. Consider types of employees as a. Manager b. Sales Person Perform the following a. Implement simple inheritance where Employee (employee ID, First Name, Last Name, Current salary) is super class, consider Manager (number of stock options) and SalesPerson (number of sales, commission rate) as subclasses. b. Define parameterized constructors in class hierarchy. c. Define methods to display status of employee (override tostring() ) and increase current payment (salary) as giving bonus by a small amount. d. Identify the different options of giving bonus (to increase current pay by small amount) and consider type of employee while giving bonus. Apply polymorphism for methods using inheritance in class hierarchy. e. Create an array of super class variables and populate array with sub class objects. Call methods using array of objects. 2. Create class Employee with name, Id, cellnum, designation, department, salary permanent (boolean) as members. Also create separate class for member name as EmpName, department as Department and salary as Salary. Members of EmpName are firstname, midname, lastname. Members of Salary are basic, dapercent, hra, pf, insurance. Members of Department are deptname,deptcode. Create an instance of Employee and initialize all its members from user input console. Access the same instance by more than one reference of Employee. Count the number of references and objects being created. [class,references,objects]. 3. Create a super class Bindu {x,y} and subclass Bindu3d {z}

11 a. include a parameterized constructor in class Bindu to initialize object. b. include a method in class Bindu to print data members of object. Override the same method in sub class and reuse the inherited method in it c. Create final static member printarr (Bindu[ ]) which print array of objects. In this method use above method to print member of individual objects of array. d. Write test class to create to array of Bindu3d type. Use the above method to print all the objects of array. 4. A bank maintains two kinds of accounts Savings account and Current account. The savings account provides simple interest, deposit and withdrawal facilities. The current account only provides deposit and withdrawal facilities. Current account holders should also maintain minimum balance. If balance falls below minimum level a service charge is imposed. Create an abstract class Account that stores customer name, account number type of account and abstract methods. From this derive the classes Curr_Account (double balance, double min_bal, double servicecharge / penalty) and and Sav_Account (double balance). Include the necessary methods in order to achieve the following: a. Define parameterized constructor in a class hierarchy. b. Allow deposit and update the balance. c. Display the balance. d. Compute interest and add to balance. e. Permit withdrawal and update the balance (check for minimum balance). f. Apply polymorphism if required for methods in class hierarchy. g. Create an array of super class / object and populate with subclass objects and call the overridden / object methods. h. Write a test program to demonstrate the above said implementations. 5. Define a interface EMPInterface (void displayemp(), void givebonus (double amount)). Define an abstract class Employee(empID, fname, lname, salary). Define a concrete class Manager (noofotockoptions), subclass of Employee and define interface methods. Perform the following

12 a. Define appropriate constructors in a class hierarchy. b. Ensure the bonus amount should not be negative and zero using exception handling mechanism (use throws and throw clauses of exception handling). c. Create array of interface reference variables and populate with manager objects. d. Write a test program to implement the above said requirements of interface implementation and exception handling. 6. Create an interface mobilephone {makeaudiocall (string ellnum), makevideocall (string cellnum), Boolean iscamerfeatured()} a. Create a subclass BudgetPhone, smartphone and implement methods appropriately. b. Create an exception class cameranotfound use it handle exception when a video call attempt is made on non camera phone. In such case audio call should be made to handle such exceptions. 7. Create window through which an account of a customer for a bank can be created and stored as objects. Also include a feature to search customer based on account number. 8. Create a window to input minor1, minor2 and assignment marks for a student and store it as object, also provide feature to display total marks of each student and number of students in each grade. 9. Write a java program to accept user name in a text box. Accept the class of the user (Faculty, student, admin etc.,) using radio buttons and the hobbies of the user using checkboxes. Display the selected options in a textarea/textbox. 10. Simulate loan application. The loans are four wheeler loan and two wheeler loan. The application has to provide functionality to calculate EMI, pay EMI and display the customer details along with his loan details till he clears the loan. The rate of interest for two wheeler loan changes from lower to higher value, the application should update the changes. Consider some collection (array) to store different loan objects. Define appropriate classes, constructors, objects and other constructs to complete the implementation.

Chapter 5 Object-Oriented Programming

Chapter 5 Object-Oriented Programming Develop code that implements tight encapsulation, loose coupling, and high cohesion Develop code that demonstrates the use of polymorphism Develop code that declares