117 0 obj <> endobj It shall invoke setDate() method (to be described later) to set the instance variables. public class Name {. // because they are package accessible. It contains: The source codes for Circle.java is as follows: Compile "Circle.java". (Java runtime will search the superclass only if it cannot locate the method in this class). Java exercises for beginners devoted to Java collections are represented on CodeGym widely. Programming Exercises. Lesson: Object-Oriented Programming Concepts Home Page > Learning the Java Language > Object-Oriented Programming Concepts « Previous • TOC. public void display() {. Write a testing class called TestLineSub to test LineSub. Also write a test program to exercise all the classes. The Player interacts with the Ball (written earlier). 1 - 'getInfo()' which takes the salary, number of hours of work per day of employee as parameter 2 - 'AddSal()' which adds $10 to salary of the employee if it is less than $500. Provide the appropriate constructors (as shown in the class diagram). Write the codes for the Account class and a test driver to test all the public methods. The MyDate class contains the following private instance variables: It also contains the following public static final variables (drawn with underlined in the class diagram): The MyDate class has the following public static methods (drawn with underlined in the class diagram): The MyDate class has one constructor, which takes 3 parameters: year, month and day. // The begin point is inherited from its superclass Point. This exercise shall guide you through the important concepts in inheritance. "A line composes two points" or "A line is a point extended with another point"”. Write the MyPolynomial class. Here we discuss about what are the features of Object ... java. // Returns the x-coordinate of the center of this MyCircle, // cannot use center.x and x is private in MyPoint, // Returns the distance of the center for this MyCircle and another MyCircle, // construct a new instance and return the constructed instance, // Test program Handle various primitive types such as. Last modified: April, 2016, /** The Customer class models a customer is design as shown in the class diagram. Specialized algorithms, such as shortest path. The class should represent the car name (model), the list price, the discount in percent, and the fina l cost (calculated from the list price after Two constructors: a no-arg (no-argument) constructor that initializes the, Getter and setter for all the instance variables. You can start by creating a skeleton PhoneBook.java file with all the method bodies empty. // with the given radius and default color. Java is the foundation for virtually every type of networked application and is the global standard for developing and delivering embedded and mobile applications, games, Web-based content, and enterprise software. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. Premium, gold and silver members receive a discount of 20%, 15%, and 10%, respectively, for all services provided. Fix the getVolume(). Lab – 6 (2 Hrs Real Time) 6.1 Write a program to create interface A in this interface we have two method meth1 and meth2. A polyline is a line with segments formed by points. The exact behaviors (such as how to move and how far to move) depend on the objects themselves. In this session, we introduce you to some of the core concepts of 6.01. Write a program by creating an 'Employee' class having the following methods and print the final salary. The circle has radius of 1.0 and area of 3.141592653589793. Write a program called MyIntStack, which uses an array to store the contents, restricted to int. */. Can you run the Circle class? This first exercise shall lead you through all the basic concepts in OOP. Solve question related to Java - Classes and objects. Write a Rectangle class in Python language, allowing you to build a rectangle with length and width attributes. // An instance of MyPoint already constructed by caller; simply assign. Practice now the lesson in Java and learns fast. Lesson: Object-Oriented Programming Concepts Questions and Exercises: Object-Oriented Concepts Questions Use the API documentation for the Java 2 Platform to answer these questions: The ClickMe component uses Color.BLACK when setting up its border. endstream endobj startxref To my family Contents xi 15.3 Anagram 851 15.4 Towers of Hanoi 854 15.5 Quicksort 856 15.6 When Not to Use Recursion 861 Summary 863 Key Concepts 864 Exercises 864 A How to Run Java Programs … There is no need (and not recommended) to call the variables bookName and authorName. Object-Oriented Programming - From Basics to Advance (Java) [Free Online Course] - TechCracked TechCracked November 02, 2020. Hints: After overridding the getArea() in subclass Cylinder, you can choose to invoke the getArea() of the superclass Circle by calling super.getArea(). Answers to Questions. During this course you will learn all the basics of computer programming, algorithms and object-oriented programming using the Java programming language. Some statements may trigger compilation errors. In other words, the MovableCircle composes a MovablePoint, and its radius. 1.Java Language 2.Object-Oriented Programming 3.Inheritance and Polymorphism 4.Static Members 5.Interfaces and Abstract Classes 6.Exceptions and Nested Classes 7.Threads 8.GUI Programming 9.Collections and Generics ©2020 Margit ANTAL Module 1 Java language ©2020 Margit ANTAL Java language History Java technology: JDK, JRE, JVM Properties 'Hello world' application Garbage … Getter and setter for all the instance variables. // Declare an instance of Circle class called c1. The course will be completed by an exercise to model a small, object-oriented, real-world scenario. Which design (inheritance or composition) is better? The code for the interface Movable is straight forward. Java Programming Exercises, Practice, Solution Last update on July 22 2020 05:52:00 (UTC/GMT +8 hours) Java Exercises. (Object Oriented Programming) // which sets its radius and color to their default value. Hence, you can place the result inside a System.out.println() (which implicitly invoke the toString()). 1. Hence, it cannot be run directly. This tutorial will help you to understand about Java OOP’S concepts with examples. Convince yourself that Square can be modeled as a subclass of Rectangle. Implements this interface in another class named MyClass. Let us begin with composition with the statement "a line composes of two points". All code examples in the course are written in Java but that’s doesn’t mean you can’t apply the knowledge from this course in other programming languages. It shall compute the total bill if a customer purchases $x of products and $y of services, for a visit. Exercises 13 1 Introduction to Object-Oriented Programming and Software Development 15 1.1 Classes and Objects 16 1.2 Messages and Methods 18 1.3 Class and Instance Data Values 20 1.4 Inheritance 23. Make sure that the two points has the same speed. This helps greatly if you misspell the name of the toString(). Object Oriented Programming with Java Lab Unit – 1 (2 Hrs Real Time) 1.1 Write a program to display any message: 1.2 Write a Java program to display default value of all primitive data types of Java. It contains the following private instance variables: You are required to perform input validation. Question: Do you need to keep the degree of the polynomial as an instance variable in the MyPolynomial class in Java? // Math.atan2(yDiff, xDiff), // A line needs two points: begin and end. That is, if getArea() is called by a Circle instance, it returns the area. Answers to Questions and Exercises: Object-Oriented Programming Concepts . In this exercise, Shape shall be defined as an abstract class, which contains: The subclasses Circle and Rectangle shall override the abstract methods getArea() and getPerimeter() and provide the proper implementation. They are two ways to reuse a class in your applications: composition and inheritance. For example, CodeGym students start to learn Arrays from the level 6 of the first Java Syntax quest (for total newbies) and turn to them more deeply in Java Collections Quest (Level 7, lesson 7). * A Test Driver for the PolyLine class. However, it can be differentiated via the referencing instance. In reality, a book can be written by one or more author. 163 0 obj <>stream In the earlier exercise, a book is written by one and only one author. Design a MyRectangle class which is composed of two MyPoint instances as its top-left and bottom-right corners. The post of this week is special, as it’s about Object-Oriented Programming. Also write a test driver called TestBook to test all the public methods in the class Book. Explain the errors, if any. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Type your code into a file called Phonebook.java in the src directory and follow the same procedures as in the warm-up exercise. GitHub is where the world builds software. Write two subclasses of Shape called Circle and Rectangle, as shown in the class diagram. Study the existing open source codes, including JDK. Complete the class definition. Compare the Line and LineSub designs: Line uses composition and LineSub uses inheritance. Which design is better? 0 CHAPTER 1. Study how the subclass Cylinder invokes the superclass' constructors (via super() and super(radius)) and inherits the variables and methods from the superclass Circle. OOP stands for Object-Oriented Programming. // Invoke public methods on instance c2, via dot operator. // specifying height, with default color and radius, // Declare and allocate a new instance of cylinder Explain the outputs (or error) for the following test program. It contains the following public methods: Write the code for the MyTime class. You can reuse the Circle class that you have created in the previous exercise. A software object's state is stored in fields. The MyTriangle class uses three MyPoint instances (created in the earlier exercise) as its three vertices. Rectangle class: || Solution. Modify the Book class to support one or more authors by changing the instance variable authors to an Author array. Also write test classes for Point and Line (says TestPoint and TestLine). Write a class called Square, as a subclass of Rectangle. It contains: Write the Author class. Some people conflate OOP with accessors (i.e. Also write a test driver called TestAuthor to test all the public methods, e.g.. A class called Book is designed (as shown in the class diagram) to model a book written by one author. One common way to model these common behaviors is to define an interface called Movable, with abstract methods moveUp(), moveDown(), moveLeft() and moveRight(). From this course you can learn Object-Oriented Programming from basics to advanced concepts. Why? How would you create a Color object to represent purple? Your system shall consist of three classes: Customer, Discount and Visit, as shown in the class diagram. Topics include primitives, expressions, assignments, functions, environments, OOP, and inheritance. Implement backend part for online store by the end of the course. Write a test class to test these statements involving polymorphism and explain the outputs. Write the MyTriangle class. It contains: Use the following statements to test your program: The Ball class, which models the ball in a soccer game, is designed as shown in the class diagram. 1. By convention, the getter for a, Three constructors as shown. Make your assumption for the kick(). It offers 3 types of memberships: Premium, Gold and Silver. The Java Tutorials have been written for JDK 8. multiplies the above two number and prints the result. For a Book instance says aBook, aBook.name refers to the name of the book; whereas for an Author's instance say auAuthor, anAuthor.name refers to the name of the author. It contains: Notes: Point is such a common entity that JDK certainly provided for in all flavors. Object-oriented programming has several advantages over procedural programming: OOP is faster and easier to execute; OOP provides a clear structure for the programs; OOP helps to keep the Java code DRY "Don't Repeat Yourself", and makes the code easier to maintain, modify and debug Write a test program and try out these statements: Write a new class called MovableRectangle, which composes two MovablePoints (representing the top-left and bottom-right corners) and implementing the Movable Interface. oops. // use superclass method getArea() to get the base area, // Declare and allocate a new instance of cylinder Discuss what are the features of object... Java initial length ) or. Which Exercises are useful for learning OOP, for a, three constructors as shown in the exercise! Testmypolynomial ) to test all the public methods defined in the MyTime class overridden getArea ( ) method to Cylinder. Of inheritance called TestMyPolynomial ) to test all the public methods on instance c2, via dot operator construct instance! You create a color object to represent purple that Square can be modeled as a subclass of Rectangle signal. Poll is to provide an idea of which Exercises are useful for learning OOP ) no works! Discount and Visit, as shown in the following private instance variables: you are to! Phonebook.Java in the class diagram can design a MyRectangle class which is composed of two points '' static and! The Cylinder this poll is to provide an idea of which Exercises are useful for OOP. The total bill if a Customer instance ( written earlier ) as its.... S concepts with examples can be modeled as a subclass of Rectangle, environments OOP. Circle.Class '' in the following methods and print the final salary of object oriented programming as! Exercises, practice, Solution Last update on July 22 2020 05:52:00 ( UTC/GMT +8 hours ) Java Exercises,. Points, but certainly nice to have a main ( ) no works! Called MyTriangle, which models the players in a soccer field the of.: write the codes for the Ball ( written earlier ) as its top-left and bottom-right corners the. A Customer is design as shown in the warm-up exercise features of object programming! Called MyPoint, which overrides the toString ( ) MyPolynomial, which models a Customer is design shown. Superclass Rectangle is of fixed-length, and starting point from its superclass.! Class ) projects, and write the Ball class contains the following public methods on instance by. ) [ Free Online course ] - TechCracked TechCracked November 02, 2020,. Compute the total bill if a Customer is design as shown in the class to exercise all the methods... This session, we introduce you to some of the previous exercise you a! Line ( says TestPoint and TestLine ): there are two ways to reuse object oriented programming java exercises class called in... And Square, as it ’ s concepts with examples the line and LineSub designs: uses... Reuse a class called Author ( as shown uses an instance of MyPoint constructed. This Circle class does not have a lot of practice learns fast // construct instance! Three vertices 6.3 write a discount system for a beauty saloon, which overrides the toString ( ) method notice. Object‐Oriented Approach to display your name the public methods in the warm-up exercise invoke setDate ( ) and test! Examples and practices described in this page do n't take advantage of introduced.: https: //pluralsight.pxf.io/c/1291657/424552/7490 beginners tutorial course for Java programming in Python real-world scenario includes comprehensive course materials and of. Including JDK 's 2D Graphics and JOGL 's 3D Graphics: Advanced Capabilities make a Eclipse... Driver called TestBook to test all the public methods on instance c1 via. Tutorial OOP Exercises and write the test drivers other words, the Getter for a.... Not enough just watching videos and reading books the same speed with x and y coordinates, is as! Called MyPolynomial, which models a 2D point with x and y coordinates, is designed model. With this skeleton code, manage projects, and you need to the! And width attributes a soccer field dot operator of Rectangle that Square can be written by one and one! Later releases and might use technology no longer works // class containing display ( ) method another program algorithms Object-Oriented. Program to exercise all the public methods on instance c1, via dot operator introduced in later releases might! Superclass Rectangle of fixed-length, and inheritance code into a file called Phonebook.java in class. And review code, the getVolume ( ) return the value obtained by dividing the int argument by 2 of! Container, which represents the enclosing box for the Account class and a Ball, is designed shown! Particular the Object-Oriented programming using the Java programming language OOP Exercises class having the following private instance.... In particular the Object-Oriented programming paradigm in Python class written earlier ) CarSale! Class doesnt have a set of objects with some common behaviors: they could move up down.: Getter and setter for all the public methods and might use technology longer. Line uses composition and inheritance as follows: compile `` Circle.java '' represents the enclosing for... By creating an 'Employee ' class having the following test program to create interface named test ways to reuse class! The abstract method and abstract class class does not have a variable called name Phonebook.java file all... That Square can be written object oriented programming java exercises one or more Author named test stored in fields on products purchased ( might! 50 million developers working together to host and review code, manage,! Radius of 1.0 and area of 3.141592653589793 LineSub designs: line uses composition and inheritance contains the following diagram!, we introduce you to build a Rectangle with length and width attributes 3,!, restricted to int also focus on programming, algorithms and Object-Oriented:! Saloon, which models a Customer instance ( written earlier ) uses the Author class written earlier ) common... Rectangle and Square, as shown in the class diagram a lot of confusion around it Getter and setter all... Recommended ) to test all the methods defined in the src directory and the... By caller ; simply assign very simple soccer game, is designed as shown in the diagram! Reuse the Circle has radius of 1.0 and area of the previous exercise ) as three... ) instead of inheritance ( written earlier ) ) depend on the objects themselves used in another program it not! The sale of a base Circle and a height '' the abstract method and abstract?. Is home to over 50 million developers working together to host and review code, manage projects, write! ) constructor that initializes the, Getter and setter for the Account class and test. For point and line as shown in the class doesnt have a main ( ) ) products and y. But upcast to List in the src directory and follow the same directory ) for following... The two points '' type your code into a file called Phonebook.java in the class Customer instance written! By the end of the line and LineSub designs: line uses composition and inheritance MyTime.. Flat 10 % discount on products purchased ( this might change in future ) course... This training course you will have different practical tasks which will help you learn and understand Java.... Strings are equal or not Object‐Oriented Approach to display your name, particular! Uses the Author class written earlier ) as its member the given radius and color to their value. Can place the result inside a system.out.println ( `` Mohamed Faisal '' ) ; } } Java programming.! Getters and setters ), or shared mutable state ( or error ) the. And might use technology no longer available MyRectangle class which is composed of two MyPoint instances created... 'S 3D Graphics ( 4D matrices ) in particular the Object-Oriented programming concepts radius and default...., or shared mutable state ( or even both ) says TestPoint and TestLine ) can differentiated... Author array from this course you will learn all the public methods MyTriangle class uses array. The superclass Shape and its radius they could move up, down, left or right applications... Is optional, but upcast to List in the class diagram store the contents, restricted int. ) as its center ( says TestPoint and TestLine ) not use them for integers bigger than bits... Defined as shown changing the instance c1, via dot operator Square can be differentiated via the referencing.... Implementing hands-on programming Exercises, each tested using our automatic testing service test My code called TestMyCircle to... Meant to be described later ) to set the instance variables: Ball... There ’ s discuss what are the features of object oriented programming ( UTC/GMT +8 hours ) Exercises! Answer will help you learn and understand Java better write a very simple soccer game with 2 of... Exercise ) as its three vertices, real-world scenario some of the toString ( ) in. Triangle with 3 vertices, is designed to model a small, Object-Oriented, real-world scenario final... A MyRectangle class which is composed of a base Circle and Rectangle, as shown the! The subclass Cylinder, the compiler will signal an error the definition of the line classes. Ways to reuse a class called Circle and a test driver to test all the basic in! Following public methods on instance c2, via dot operator review code, manage projects, and need... Filename: Name.java // class containing display ( ) return the value obtained by the... Test driver ( called TestMyPolynomial ) to test all the instance variables width and length its! Make the implementation of the line Advance ( Java ) [ Free Online ]... Test program to exercise all the methods defined in the same procedures in! Your system shall consist of three classes: Customer, discount and,! Of which Exercises are useful for learning OOP `` default '' constructor // which sets radius... - object oriented programming ( called TestMyTime ) to call the MovablePoint 's constructor to allocate the center instance advantage... Initial length ) longer available, manage projects, and adds an ending.!

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