tailieunhanh - Chapter 3 Using Classes and Objects

In object-oriented programming, a class is a construct that is used to create instances of itself – referred to as class instances, class objects, instance objects or simply objects. A class defines constituent members which enable its instances to have state and behavior.[1] Data field members (member variables or instance variables) enable a class instance to maintain state. Other kinds of members, especially methods, enable the behavior of class instances. Classes define the type of their instances.[2]. | Chapter 3 Using Classes and Objects © 2004 Pearson Addison-Wesley. All rights reserved 3- Using Classes and Objects We can create more interesting programs using predefined classes and related objects Chapter 3 focuses on: object creation and object references the String class and its methods the Java standard class library the Random and Math classes formatting output enumerated types wrapper classes graphical components and containers labels and images © 2004 Pearson Addison-Wesley. All rights reserved 3- Outline Creating Objects The String Class Packages Formatting Output Enumerated Types Wrapper Classes Components and Containers Images © 2004 Pearson Addison-Wesley. All rights reserved 3- Creating Objects A variable holds either a primitive type or a reference to an object A class name can be used as a type to declare an object reference variable String title; No object is created with this declaration An object reference variable holds the address of an object The . | Chapter 3 Using Classes and Objects © 2004 Pearson Addison-Wesley. All rights reserved 3- Using Classes and Objects We can create more interesting programs using predefined classes and related objects Chapter 3 focuses on: object creation and object references the String class and its methods the Java standard class library the Random and Math classes formatting output enumerated types wrapper classes graphical components and containers labels and images © 2004 Pearson Addison-Wesley. All rights reserved 3- Outline Creating Objects The String Class Packages Formatting Output Enumerated Types Wrapper Classes Components and Containers Images © 2004 Pearson Addison-Wesley. All rights reserved 3- Creating Objects A variable holds either a primitive type or a reference to an object A class name can be used as a type to declare an object reference variable String title; No object is created with this declaration An object reference variable holds the address of an object The object itself must be created separately © 2004 Pearson Addison-Wesley. All rights reserved 3- Creating Objects Generally, we use the new operator to create an object title = new String ("Java Software Solutions"); This calls the String constructor, which is a special method that sets up the object Creating an object is called instantiation An object is an instance of a particular class © 2004 Pearson Addison-Wesley. All rights reserved 3- Invoking Methods We've seen that once an object has been instantiated, we can use the dot operator to invoke its methods count = () A method may return a value, which can be used in an assignment or expression A method invocation can be thought of as asking an object to perform a service © 2004 Pearson Addison-Wesley. All rights reserved 3- References Note that a primitive variable contains the value itself, but an object variable contains the address of the object An object reference can be thought of as a pointer to the .

• Kỹ thuật lập trình
• Object class and
• Building object class
• algorithm programming
• object oriented programming
• component Access
• Using Classes
• Lecture Object Oriented programming
• Bài giảng Lập trình hướng đối tượng
• Class collection
• Class set
• Class hierarchy
• Class – Object – Method
• Bài giảng Class – Object – Method
• Lớp – Đối tượng – Phương thức
• Thuộc tính truy cập
• Hàm dựng Constructor
• Nạp chồng override
• Date class
• Creating specialDate class
• Modify access specifier
• Class compatibility
• Object Oriented modeling
• Eliminate irrelevant classes
• Class & Object Diagrams Software Design Methodology
• Class & Object Diagrams
• Classes versus objects
• Multiple inheritance
• Multiplicity symbols
• Association role names
• Overriding member functions of base class
• Overriding member functions
• Base class
• Class Building
• Data abstraction
• Message passing
• Class member declaration
• Object Oriented Programing
• Lecture Object Oriented Programing
• Programming languages
• Class string
• Class character
• Concatenating strings
• Declaring class variables
• Variables of classes
• Member functions
• Function inside class body
• Function outside class body
• Abstract class
• Concrete concept
• Pure virtual functions
• Java programming language
• Bài giảng ngôn ngữ lập trình Java
• Designing and writing a class
• Writing constructors
• instance and class members
• The object class
• More on class
• Enum types
• The class path
• Documentation comments for class
• Declaring member variables
• Objects presents Class
• The this keyword
• Object Oriented Data Modeling
• Data Modeling
• UML Language
• Object Modeling Example
• Tranform Class Diagram to Relational Database Schema
• Data hierarchy
• Class file
• Object serialization
• Object Oriented Programming with Java
• Instance data values
• Class data value
• Software development
• Lập trình hướng đối tượng
• Static class data
• Derived class constructors
• Class association
• Object association
• Hierarchy of inheritance
• Direct base class
• Indirect base class
• The Object Flow Graph
• State Diagrams
• The eLib Program
• Interaction Diagrams
• Object Diagram
• Class Diagram