Java căn bản - Chapter4
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The document discusses defining programmer-defined classes in Java. It provides examples of defining a Bicycle class with data members and methods, creating multiple Bicycle objects, and using the Bicycle class in another class. It also covers concepts like visibility modifiers, constants, local variables, and passing objects to methods.
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private:
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The document discusses data abstraction and user-defined data types in C++. It explains that a data type provides a formal description of the domain, operations, and representation of values. Basic types like int and char are described, as well as user-defined types using the typedef keyword or class definitions. The class allows modeling data with attributes and defining operations on the data type through member functions.
OOP and C++Classes
C++ is computer programming language.It is very important computer programming language.C++ is easy to understand but it need a lot practice and hardworking.Classes and Objects are the most important topics in C++ and it is necessary to understand it.Similarly the use of Constructors is also very important to understand to learn C++These are descriptive and easy slides about Classes in C++.By studying these slides I strongly believe that you can clear your concepts.If you are in doubt and uncleared about Classes in C++ ,then you are at the right place.Read the whole slides and make your concepts clear.
14. Defining Classes
Defining Simple Classes
Using Own Classes and Objects
Access Modifiers
Constructors and Initializers
Defining Fields
Defining Properties, Getters and Setters
Defining Methods
Exercises: Defining and Using Own Classes
Object Oriented Programming with Java
The document discusses object-oriented programming concepts like classes, objects, inheritance, encapsulation, and composition. It provides examples of how these concepts can be implemented in Java. It explains that a class defines common attributes and behaviors of objects, while an object is an instance of a class. Inheritance allows classes to extend and override methods of parent classes. Encapsulation involves making attributes private and accessing them via getter/setter methods. Composition refers to objects having other objects as members.
ccc
Classes and objects are fundamental concepts in object-oriented programming. A class defines the data and functions that characterize objects of a certain kind, acting as a blueprint. An object is an instance of a class, which reserves and allocates memory at runtime. Classes use access specifiers like public and private to determine whether data members and methods can be accessed within or outside the class. Objects are declared as instances of a class and can access class members using the dot operator. Member functions allow manipulating object data.
Ap Power Point Chpt4
This document provides an overview of key concepts related to writing classes in Java, including:
- Defining classes to create custom objects with state (data) and behaviors (methods)
- Encapsulation and using access modifiers like public and private to control visibility
- Declaring methods, parameters, and return types
- Overloading methods by having multiple methods with the same name but different parameters
- Constructors for initializing new objects
Classes, objects and methods
The document discusses object-oriented programming concepts like classes, objects, member functions, data members, constructors, and encapsulation. It explains that a class defines the structure and behavior of objects, with data members representing attributes and member functions representing behaviors. Constructors initialize an object's data when it is created. Encapsulation protects data by making it private and only accessible through public member functions.
C++ classes
This document provides an overview of classes and objects in C++. It defines object-oriented programming as encapsulating data and functions into packages called classes. A class defines both data members (attributes) and member functions (behavior). Class members can be declared as private or public, with private only accessible within the class and public accessible outside. The document also discusses creating objects from classes, constructors, destructors, and accessing class members. Examples are provided of defining a Circle class to represent geometric circles and a Time class to represent time values.
Oop objects_classes
The document discusses objects and classes in object-oriented programming, explaining that classes define templates for objects with data fields and methods, objects are instances of classes that contain state in their data fields and behavior through methods, and constructors are used to initialize objects when they are created from a class.
Chapter 2
The document provides an overview of key concepts in the C# programming language including variables and data types, arrays, conditional logic, loops, methods, parameters, and delegates. It discusses basic syntax, operators, and how to perform common tasks like type conversions and working with dates and strings. The goal is to give readers enough information to get started with C# as well as refer back to for language details while working through ASP.NET examples.
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Java căn bản - Chapter4
- 1. Chapter 4 Defining Your Own Classes Part 1
- 4. First Example: Using the Bicycle Class class BicycleRegistration { public static void main ( String [] args ) { Bicycle bike1, bike2; String owner1, owner2; bike1 = new Bicycle ( ) ; //Create and assign values to bike1 bike1.setOwnerName ( "Adam Smith" ) ; bike2 = new Bicycle ( ) ; //Create and assign values to bike2 bike2.setOwnerName ( "Ben Jones" ) ; owner1 = bike1.getOwnerName ( ) ; //Output the information owner2 = bike2.getOwnerName ( ) ; System.out.println ( owner1 + " owns a bicycle." ) ; System.out.println ( owner2 + " also owns a bicycle." ) ; } }
- 5. The Definition of the Bicycle Class class Bicycle { // Data Member private String ownerName; //Constructor: Initialzes the data member public void Bicycle ( ) { ownerName = "Unknown" ; } //Returns the name of this bicycle's owner public String getOwnerName ( ) { return ownerName; } //Assigns the name of this bicycle's owner public void setOwnerName ( String name ) { ownerName = name; } }
- 7. The Program Structure and Source Files There are two source files. Each class definition is stored in a separate file. To run the program: 1. javac Bicycle.java (compile) 2. javac BicycleRegistration.java (compile) 3. java BicycleRegistration (run) BicycleRegistration Bicycle BicycleRegistration.java Bicycle.java
- 8. Class Diagram for Bicycle Method Listing We list the name and the data type of an argument passed to the method. Bicycle setOwnerName(String) Bicycle( ) getOwnerName( )
- 9. Template for Class Definition class { } Import Statements Class Comment Class Name Data Members Methods (incl. Constructor)
- 13. Second Example: Using Bicycle and Account class SecondMain { //This sample program uses both the Bicycle and Account classes public static void main ( String [] args ) { Bicycle bike; Account acct; String myName = "Jon Java" ; bike = new Bicycle ( ) ; bike.setOwnerName ( myName ) ; acct = new Account ( ) ; acct.setOwnerName ( myName ) ; acct.setInitialBalance ( 250.00 ) ; acct.add ( 25.00 ) ; acct.deduct ( 50 ) ; //Output some information System.out.println ( bike.getOwnerName () + " owns a bicycle and" ) ; System.out.println ( "has $ " + acct.getCurrentBalance () + " left in the bank" ) ; } }
- 14. The Account Class class Account { private String ownerName; private double balance; public Account ( ) { ownerName = "Unassigned" ; balance = 0.0; } public void add ( double amt ) { balance = balance + amt; } public void deduct ( double amt ) { balance = balance - amt; } public double getCurrentBalance ( ) { return balance; } public String getOwnerName ( ) { return ownerName; } public void setInitialBalance ( double bal ) { balance = bal; } public void setOwnerName ( String name ) { ownerName = name; } } Page 1 Page 2
- 15. The Program Structure for SecondMain To run the program: 1. javac Bicycle.java (compile) 2. javac Account.java (compile) 2. javac SecondMain.java (compile) 3. java SecondMain (run) Note: You only need to compile the class once. Recompile only when you made changes in the code. SecondMain Bicycle SecondMain.java Bicycle.java Account.java Account
- 19. Passing a Student Object
- 25. Diagram Notation for Visibility public – plus symbol (+) private – minus symbol (-)
- 27. A Sample Use of Constants class Dice { private static final int MAX_NUMBER = 6; private static final int MIN_NUMBER = 1; private static final int NO_NUMBER = 0; private int number; public Dice ( ) { number = NO_NUMBER; } //Rolls the dice public void roll ( ) { number = ( int ) ( Math.floor ( Math.random () * ( MAX_NUMBER - MIN_NUMBER + 1 )) + MIN_NUMBER ) ; } //Returns the number on this dice public int getNumber ( ) { return number; } }
- 30. Sample Matching class MusicCD { private String artist; private String title; private String id; public MusicCD ( String name1, String name2 ) { String ident; artist = name1; title = name2; ident = artist.substring ( 0,2 ) + "-" + title.substring ( 0,9 ) ; id = ident; } ... }
- 35. Required Classes input computation output LoanCalculator Loan JOptionPane PrintStream