Assignment4-AbstractInterfacePolymorphismStudentFall2019.docx - COMP 2150 – Spring 2019 Homework 4 Abstract/Interface/Polymorphism(73 points Number of


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COMP 2150 – Spring 2019 Homework 4: Abstract/Interface/Polymorphism (73 points) Objectives: : Abstract/Interface/Polymorphism (1) (10 points) This question is about working with abstract class in Java program. Create two classes (A and B) with A has an abstract method ( void call ( )) and B extends from A. Class A has a concrete method callA ( ) that displays “concrete method callA() in A”. B is a concrete class. Your AbstractDemo program should display the following: B’s implementation of A's call( ) . concrete method callA( ) in A (2) (10 points) This question is about implementing interface methods in java programming. Create interface A1 that has two methods (void m1 ( ), void m2 ( ) ). Create another interface B1 that extends interface A1 plus a method ( void m3( ) ) of its own. Write another Class (TheClass ) to implement interface B1. Each of the above methods (m1 ( ), m2 ( ), and m3 ( ) ) displays a message about the method. For example m1( ), when invoked (aka called ) will display “ implement m1 ( ) “. Write an interfaceDemo class to display the3 messages via one object. Number of People: Individual. Feel free to ask me for help, or visit the Computer Science Learning Center ( ), or visit the Fri/Sat 9 – 10 am supplemental class @DH103 Due: (Oct 6, 2019 ) (SUNDAY) 11:59 pm Submission: Zip all your Java source files (the one with .java extension) (you can zip the entire project folder if using an IDE) into a single zip file and upload it to the proper folder in the eLearn dropbox at . Coding Style: (use the Format tool in Eclipse) . Use standard Java naming conventions for variableAndMethodNames , ClassNames , CONSTANT_NAMES . You must have comments for all your codes. Comments should focus on what and why and NOT how.
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