LAB 9: INHERITANCE, ABSTRACT AND PACKAGELearning OutcomesThis Lab sheet encompasses of activities which 9A, 9B, 9C, 9D and 9E

By the end of this laboratory session, you should be able to:1. Create packages in Java program.

2. Apply keyword super in Java programs.

3. Implement overriding method in Java programs

4. Implement abstract classes in Java programs.

Hardware/Software: Computer with JDK latest version

Activity 9AActivity Outcomes: Create packages in Java programs

Procedures:Step1: Create a subdirectory test in the current directory.

Step 2: Type below program using text editor (Note Pad).

Step 3: Save your program as Class1.java in the “test” subdirectory. For example if d:\ is the

current directory, then create d:\test and save ClassOne.java in it.

Step 4: Save and compile the program.

Step 5: Open a new text editor (Note Pad).

Step 6: Type the below code and save it as PackageOne.java in the current directory

Step 7: If d: is the directory in which the Packtest1.java is present and the user-defined

package is in d:\pack1, then set the classpath as set CLASSPATH=%CLASSPATH%; D:\PACK1; in the current directory. Type the above command in the command prompt and

execute it to set the path.

Step 8: Compile and run the program.

Step 9: Observe the output from the program.

Output

Activity 9BActivity Outcomes: Apply keyword super in Java programs

Procedures:Step1: Type below program using text editor (note Pad)

Step 2: Save your program as SuperClass.java in the “bin” directory.

Step 3: Open a new text editor (Note Pad)

Step 4: Type the code and save it as SubClass.java bin directory.

Output

Activity 9CActivity Outcomes: Implement overriding method in Java programs.

Procedures:Step1: Type below program using text editor (note Pad)

Step 2: Save your program as SuperA.java in the “bin” directory.

Step 3: Open a new text editor (Note Pad)

Step 4: Type the code and save it as SubClassB.java bin directory.

Step 5: Compile and run the program.

Output

Activity 9DActivity Outcomes: Implement abstract classes in Java programs.

Procedures:Step1: Type below program using text editor (note Pad) that come with Windows Platform.

Step 2: Type the below program using text editor.

Step 3: Save the above program as Figure.java in bin directory

Step 4: Open a new text editor, type the below program and save it as Rectangle.java

Step 5: Open a notepad, type the below program and save it as Triangle.java in the same

directory

Step 6: Open text editor and type the below program as a main program

Step 7: Save the program as AbstractAreas.java

Step 8: Compile and run the program and then see the result.

Output:

Activity 9EActivity Outcomes: Implement polymorphism in Java programs.

Procedures:Step1: Copy all the code in activity 9D in different file

Step 2: Adding another constructor that retrieve both parameter as integer and a method to

calculate volume in Rectangle.class

Step 3: Do the same thing for the Triangle.class. Copy the triangle class and paste in different

file. Create another constructor with retrieve int as for both parameters.

B

c a

A b C

Next, create a method to calculate Pythagoras in Figure class. Use the below formula:

C2 = a2 + b2

After that create a method to calculate Volume of the rectangle in figure class.

Step 4: Type below code and determine the output

Step 5: Create a main class to test your program. Rewrite the below code and run it.

Output:

LAB EXERCISE 9: Inheritance, Abstract And Package

Instructions: Answer all questions. You are required to print the program codes and it’s output. In order to make sense of program listing you have written in the past it is a good

idea to being each program with the following sections./*Author:Program Title:Description:Date:Version Number:*/

Comment your code! Trust me it’s worth the extra effort.

Indent your code to increase clarity

Questions:1. Create package store. Write a class name store in that package. Think of the

attributes and methods should be for store as super class. Create a subclasses

and store in packages for store such as music store, bike store and grocery

store. Design any output that your think suitable for the classes.

2. Create an abstract Auto class with fields for the car make and price. Include get

and set methods for these fields: the setPrice() method is abstract. Create two

subclasses for individual automobile makers (for example, Ford and Chevy) and

include appropriate setPrice() methods in each subclass. Finally, write a program

that uses the Auto class and subclass to display information about different cars.

OUTPUT

CONCLUSIONEnd of this lab, student should be able to know how to create packages in Java

program and apply keyword super in Java programs. Besides that, student should

know how to implement overriding method in Java programs and implement abstract

classes in Java programs.