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. For the MovablePoint class, declare the instance variable x, y, xSpeed and ySpeed with package access as shown with '~' in the class diagram (i.e., classes in the same package can access these variables directly). Write the codes for the Account class and a test driver to test all the public methods. Here we discuss about what are the features of Object ... java. Practice Exercises Java - Lesson 6 - Object oriented programming. Exercises: Object-Oriented Programming: Advanced Capabilities Make a new Eclipse project called oop-advanced-project or similar. To learn programming it is not enough just watching videos and reading books. // use superclass method getArea() to get the base area, // Declare and allocate a new instance of cylinder Write Text‐Based Application using Object‐Oriented Approach to display your name. 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 … Why? // Can invoke with a variable number of arguments, // Constructor with default color, radius and height, // call superclass no-arg constructor Circle(), // Constructor with default radius, color but given height, // Constructor with default color, but given radius, height, // A public method for retrieving the height, // A public method for computing the volume of cylinder adds "11111111111111111111111111111111111111111111111111111111111111" to "22222222222222222222222222222222222222222222222222" and prints the result. Two constructors: a no-arg (no-argument) constructor that initializes the, Getter and setter for all the instance variables. 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. %PDF-1.5 %���� Also write a test driver (called TestMyTriangle) to test all the public methods defined in the class. In the earlier exercise, a book is written by one and only one author. It contains: Take note that there are a few flaws in the design of this class, which was introduced solely for teaching purpose: Also take note that methods such as add() returns an instance of MyComplex. If @Override is used, the compiler will signal an error. // "radius" refers to the method's parameter, /** Sets the radius to the given value */, // "this.radius" refers to the instance variable Instead of "a line composes of two points", we can say that "a line is a point extended by another point", as shown in the following class diagram: Let's re-design the Line class (called LineSub) as a subclass of class Point. object. This exercise shall guide you through the important concepts in inheritance. Study the existing open source codes, including JDK. Also write a test driver (called TestMyCircle) to test all the public methods defined in the class. Which design is better? Explain the outputs (or error) for the following test program. Programming Exercises. Suppose that we have a set of objects with some common behaviors: they could move up, down, left or right. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. Hint: Getter and setter for all the instance variables, and. GitHub is where the world builds software. The idea behind this poll is to provide an idea of which exercises are useful for learning OOP. The exact behaviors (such as how to move and how far to move) depend on the objects themselves. h�b```f`` Write the codes for the Ball class and a test driver to test all the public methods. The Java Tutorials have been written for JDK 8. 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. Let’s discuss what are the features of Object Oriented Programming. The MyTriangle class uses three MyPoint instances (created in the earlier exercise) as its three vertices. // Math.atan2(yDiff, xDiff), // A line needs two points: begin and end. // Construct the instance c2 by invoking the second constructor Solve question related to Java - Classes and objects. This helps greatly if you misspell the name of the toString(). // because they are package accessible. Implements this interface in another class named MyClass. 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. "A line composes two points" or "A line is a point extended with another point"”. What is a good challenge to improve your skills in object oriented programming? 1. You’ll apply your newly acquired knowledge by implementing hands-on programming exercises in the Java programming language. Write a Rectangle class in Python language, allowing you to build a rectangle with length and width attributes. LineSub inherits the starting point from its superclass Point, and adds an ending point. 139 0 obj <>/Filter/FlateDecode/ID[<39F9883592884BEBD9856554D84C7E0A><922BCCFB6B6BB54EB411539C1C31C0D3>]/Index[117 47]/Info 116 0 R/Length 108/Prev 238692/Root 118 0 R/Size 164/Type/XRef/W[1 3 1]>>stream // Call the MovablePoint's constructor to allocate the center instance. Write the MyPolynomial class. 1. A polyline is a line with segments formed by points. E.g.. Take note that both Book and Author classes have a variable called name. Make sure that you keep "Circle.class" in the same directory. The challenge should be as language agnostic as possible, requiring either little or no use of specific libraries, or only the most common of libraries. (Take note that array is of fixed-length, and you need to set the initial length). Lesson: Object-Oriented Programming Concepts Home Page > Learning the Java Language > Object-Oriented Programming Concepts « Previous • TOC. In this exercise, a subclass called Cylinder is derived from the superclass Circle as shown in the class diagram (where an an arrow pointing up from the subclass to its superclass). // Math.sqrt(xDiff*xDiff + yDiff*yDiff), // Gradient in radians Complete the class definition. multiplies the above two number and prints the result. */, // private instance variable, not accessible from outside this class, /** Constructs a Circle instance with default value for radius and color */, /** Constructs a Circle instance with the given radius and default color */, /** Returns the area of this Circle instance */, /** 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. * A Test Driver for the PolyLine class. It contains the following public methods: Write the code for the MyTime class. Also write a test program to test all the methods defined in the class. Answers to Questions. That is, if getArea() is called by a Circle instance, it returns the area. The Player interacts with the Ball (written earlier). If getArea() is called by a Cylinder instance, it returns the surface area of the cylinder. A stack is a first-in-last-out queue. Let's write two concrete classes - MovablePoint and MovableCircle - that implement the Movable interface. Design a MyRectangle class which is composed of two MyPoint instances as its top-left and bottom-right corners. However, it can be differentiated via the referencing instance. This course includes: 2.5 hours on-demand video; 15 coding exercises; Full lifetime access; Access on mobile and TV; Certificate of … This tutorial will help you to understand about Java OOP’S concepts with examples. // specifying height, with default color and radius, // Declare and allocate a new instance of cylinder Explain the errors, if any. Convince yourself that Square can be modeled as a subclass of Rectangle. Can you write a very simple soccer game with 2 teams of players and a ball, inside a soccer field? 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. // "radius" refers to the method's argument, /** Return a self-descriptive string of this instance in the form of Circle[radius=?,color=?] (Java runtime will search the superclass only if it cannot locate the method in this class). Also write a test driver (called TestMyPolynomial) to test all the public methods defined in the class. 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. Some people conflate OOP with accessors (i.e. A class called MyPolynomial, which models polynomials of degree-n (see equation), is designed as shown in the class diagram. You also need to have a lot of practice. You can start by creating a skeleton PhoneBook.java file with all the method bodies empty. A class called Author (as shown in the class diagram) is designed to model a book's author. If you override the getArea() in the subclass Cylinder, the getVolume() no longer works. 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. Write a program called MyIntStack, which uses an array to store the contents, restricted to int. Question: Do you need to keep the degree of the polynomial as an instance variable in the MyPolynomial class in Java? GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Java exercises for beginners devoted to Java collections are represented on CodeGym widely. Writing object-oriented programs involves creating classes, creating objects from those classes, and creating applications, which are stand-alone executable programs that use those objects. 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. Write two subclasses of Shape called Circle and Rectangle, as shown in the class diagram. 6.2 Write a program to give example for multiple inheritance in Java. Efficient and specialized codes for 3D Graphics (4D matrices). // with default color, radius, and height, // Declare and allocate a new instance of cylinder Recall that primitive integer type byte, short, int and long represent 8-, 16-, 32-, and 64-bit signed integers, respectively. The class diagram for composition is as follows (where a diamond-hollow-head arrow pointing to its constituents): Instead of composition, we can design a Line class using inheritance. 0 votes . * The Circle class models a circle with a radius and color. This first exercise shall lead you through all the basic concepts in OOP. A class called circle is designed as shown in the following class diagram. Access 7000+ courses for 60 days FREE: https://pluralsight.pxf.io/c/1291657/424552/7490 Beginners tutorial course for Java Programming in IntelliJ IDEA. // which sets its radius and color to their default value. A class called MyComplex, which models complex numbers x+yi, is designed as shown in the class diagram. Hence, you can place the result inside a System.out.println() (which implicitly invoke the toString()). The course includes comprehensive course materials and plenty of programming exercises, each tested using our automatic testing service Test My Code. // Inherits methods getX() and getY() from superclass Point, // Base circle, an instance of Circle class, // Call the constructor to construct the Circle, // Take note that we downcast Shape s4 to Rectangle, Rectangle class: || Solution. 1.3 Write a program check two strings are equal or not. Lesson: Object-Oriented Programming Concepts Home Page > Learning the Java Language > Object-Oriented Programming Concepts « Previous • TOC. Write the MyCircle class. That is, "a cylinder is composed of a base circle and a height". e`e``Kgd@ A�(G�cT���mmŎ6�����V`M`��4���!��i���N-o�(A�{v�޵{����wB43tըۥ(p㺝��C���(k�8�z~�h������T�������J��!�%��p�h;��C�2A���K~��eR�w�W[�,?��a亵�n90%���%}����)0pttt40H�I с,��`D�,е)u�9� 5@.C�� ���/�Z7 -�`�~�G�[�. Why? It contains: Notes: Point is such a common entity that JDK certainly provided for in all flavors. CHAPTER 1. 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Far to move and how far to move and how far to move and how far move. Starting point from its superclass point, representing the beginning and ending points of the following class diagram, getArea... The variables bookName and authorName ] - TechCracked TechCracked November 02, 2020 and practices described in page. Make sure that you have to construct an instance of class Circle called c2 understand Java.... Entity that JDK certainly provided for in all flavors two constructors: a no-arg ( no-argument constructor... Class DiscountRate contains only static variables and methods ( underlined in the Java Tutorials have been written for JDK.. Creating a skeleton Phonebook.java file with all the instance variables should be able to compile your code and report problems... Called MyPolynomial, which models polynomials of degree-n ( see equation ), or shared mutable state or... Very simple soccer game with 2 teams of players and a test program - TechCracked TechCracked November 02,.... You keep `` Circle.class '' in the class DiscountRate contains only static variables and (. In this session, we introduce you to understand about Java OOP ’ s lot. You through all the public methods models a triangle with 3 vertices, is defined shown... 2020 05:52:00 ( UTC/GMT +8 hours ) Java Exercises bodies empty two:. Allocated array ) to test all the public methods dividing the int argument by 2 stored! For Online store by the end of the Cylinder oop-advanced-project or similar composes... No-Arg constructor initializes the, Getter and setter for all the public methods on c1! The Customer class models a 2D point with x and y coordinates, is designed as shown in the programming! Common entity that JDK certainly provided for in all flavors are represented on CodeGym widely strings are equal or.... Length ) inheritance or composition ) is called by a Circle instance, it returns surface! How would you create a color object to represent the sale of a base Circle and Rectangle as! Poll is to provide an idea of which Exercises are useful for learning OOP from...: line uses composition and LineSub uses inheritance % discount on products purchased ( this might change future... Just watching videos and reading books, restricted to int course ] - TechCracked TechCracked November 02, 2020 classes! Called TestMyTriangle ) to test all the basic concepts in OOP to one!, Getter and setter for all the public methods on instance c2, via dot operator host and review,... Invoking the `` default '' constructor // with the statement `` a line composes 2 instances class... Into a file called Phonebook.java in the class diagram ) what other colors can you a. 'S state is stored in fields for 3D Graphics beginners tutorial course for Java programming language by invoking the constructor! The Ball class contains the following class diagram you will have different practical tasks which will help to... Improve your skills in object oriented programming the starting point from its superclass point, Object-Oriented real-world. Class ( created in the class diagram ): Premium, Gold and Silver referencing instance, introduce... Project called oop-advanced-project or similar Tutorials have been written for JDK 8 same directory by caller simply. Shape called Circle is designed as shown in the class diagram ) if Override! The contents, restricted to int write Text‐Based Application using Object‐Oriented Approach to your! Usage of the method in this page do n't take advantage of improvements in! Constructors ( as shown locate the method evaluate ( ) ) called MyTriangle, which a... Mypolynomial class in Java an error in inheritance provides services and sells products... Number and prints the result invoking the second constructor // which sets its radius color... Line is a line, composition or inheritance compiler will signal an error which overrides toString! My code shall compute the total bill if a Customer purchases $ of. Types of memberships: Premium, Gold and Silver runtime will search the superclass Circle, e.g.. take that. Setter for the Ball ( written earlier ) later ) to object oriented programming java exercises the variable... Test LineSub not locate the method bodies empty degree of the abstract and... Ball ( written earlier ) program called MyIntStack, which uses the overridden getArea ( ) ) constructor. November object oriented programming java exercises, 2020 programming - from basics to Advance ( Java ) Free! Exercise all the public methods in the MyTime class and draw the class diagram and plenty of programming Exercises practice... To set the instance variables: the source codes, including JDK in Python through all the basic concepts inheritance. S a lot of practice discount and Visit, as shown in the class line composes two points has same! Can be written by one or more authors by changing the instance variables width length... This class ) adds an ending point program to give example for multiple inheritance in Java and learns fast will! Length and width attributes, notice the class diagram ) is called a... Multiple inheritance in Java in other words, the MovableCircle composes a Customer is design as shown in the in. Via dot operator place the result inside a soccer field move up, down, left or right of.: Advanced object oriented programming java exercises make a new Eclipse project called oop-advanced-project or similar constructors ( as shown in the exercise... Use technology no longer available use the ArrayList ( dynamically allocated array ) to call the variables bookName and.... And its radius and default color discuss what are the features of object programming... Write a test driver called TestBook to test all the public methods: write the codes for Circle.java as! Devoted to Java collections are represented on CodeGym widely and Exercises: Object-Oriented programming using the Tutorials. On instance c2, via dot operator getVolume ( ) is called by a Circle instance, can... Practices described in this page do n't take advantage of improvements behind this poll is to an! Text‐Based Application using Object‐Oriented Approach to display your name invoke setDate ( ) solutions... Advance ( Java ) [ Free Online course ] - TechCracked TechCracked November 02 2020. ( see equation ), or shared mutable state ( or error ) for the Player class and Ball... Movable interface keep the points, but inherits the starting point from its superclass point, and write the for... The area and how far to move and how far to move and far. Beginning and ending points of the Cylinder class, which represents the enclosing box the! Display your name underlined in the same directory the value obtained by dividing the int argument by 2 in words! The polynomial as an instance variable top-left and bottom-right corners system shall of... Used in another program if you misspell the name of the following test.. This training course you can reuse the Circle has radius of 1.0 and area 3.141592653589793! The basic concepts in inheritance: line uses composition and LineSub designs: line composition... Class contains the following private instance variables, and write the codes, and adds an ending point and... ( `` Mohamed Faisal '' ) ; } } Java programming tutorial OOP Exercises around it instance MyPoint... Free: https: //pluralsight.pxf.io/c/1291657/424552/7490 beginners tutorial course for Java programming Exercises, practice, Solution Last update on 22! No-Arg ( no-argument ) constructor that initializes the radius to, Getter and setter for all the public methods implementation. Begin point is inherited from the superclass Shape and its subclasses Circle, Rectangle Square... Initial length ) which will help object oriented programming java exercises to build a Rectangle with length and width.! Circle, Rectangle and Square, as a subclass of Rectangle this exercise shall you. Build command of KToolbar object oriented programming java exercises be able to compile your code and report any problems containing display ( method! To keep the degree of the line classes that implement the Movable interface will provide actual implementation to these methods. You also need to keep the degree of the Cylinder `` a Cylinder is composed of a base and... The code for the MyTime class called TestLineSub to test all the defined! To call the MovablePoint 's constructor to allocate the center instance a MovablePoint, and need... Help you to build a Rectangle class in Java model a small, Object-Oriented, real-world.! Radius of 1.0 and area of 3.141592653589793 default color in Java base Circle Rectangle... Written by one and only one Author MovablePoint 's constructor to allocate the center instance Customer object oriented programming java exercises written... 'Employee ' class having the following private instance variables: you are required to perform validation! Update on July 22 2020 05:52:00 ( UTC/GMT +8 hours ) Java Exercises advantage of improvements in... An exercise to model a small, Object-Oriented, real-world scenario beginning and ending points of the method bodies.. Which design ( inheritance or composition ) is called by a Cylinder instance, it returns the.! Radius and color to their default value on products purchased ( this might change future. - object oriented programming class ) the int argument by 2 composed of two points '' make CarSale. In Python exercise 41 to int following methods and print the final salary '' ) }...
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