Oracle программирование языке java

Lesson: Object-Oriented Programming Concepts

If you’ve never used an object-oriented programming language before, you’ll need to learn a few basic concepts before you can begin writing any code. This lesson will introduce you to objects, classes, inheritance, interfaces, and packages. Each discussion focuses on how these concepts relate to the real world, while simultaneously providing an introduction to the syntax of the Java programming language.

What Is an Object?

An object is a software bundle of related state and behavior. Software objects are often used to model the real-world objects that you find in everyday life. This lesson explains how state and behavior are represented within an object, introduces the concept of data encapsulation, and explains the benefits of designing your software in this manner.

What Is a Class?

A class is a blueprint or prototype from which objects are created. This section defines a class that models the state and behavior of a real-world object. It intentionally focuses on the basics, showing how even a simple class can cleanly model state and behavior.

What Is Inheritance?

Inheritance provides a powerful and natural mechanism for organizing and structuring your software. This section explains how classes inherit state and behavior from their superclasses, and explains how to derive one class from another using the simple syntax provided by the Java programming language.

What Is an Interface?

An interface is a contract between a class and the outside world. When a class implements an interface, it promises to provide the behavior published by that interface. This section defines a simple interface and explains the necessary changes for any class that implements it.

What Is a Package?

A package is a namespace for organizing classes and interfaces in a logical manner. Placing your code into packages makes large software projects easier to manage. This section explains why this is useful, and introduces you to the Application Programming Interface (API) provided by the Java platform.

Questions and Exercises: Object-Oriented Programming Concepts

Use the questions and exercises presented in this section to test your understanding of objects, classes, inheritance, interfaces, and packages.

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Oracle программирование языке java

The Java Tutorials have been written for JDK 8. Examples and practices described in this page don’t take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.

The Java Tutorials are practical guides for programmers who want to use the Java programming language to create applications. They include hundreds of complete, working examples, and dozens of lessons. Groups of related lessons are organized into «trails».

Trails Covering the Basics

• Getting Started — An introduction to Java technology and lessons on installing Java development software and using it to create a simple program.
• Learning the Java Language — Lessons describing the essential concepts and features of the Java Programming Language.
• Essential Java Classes — Lessons on exceptions, basic input/output, concurrency, regular expressions, and the platform environment.
• Collections — Lessons on using and extending the Java Collections Framework.
• Date-Time APIs — How to use the java.time pages to write date and time code.
• Deployment — How to package applications and applets using JAR files, and deploy them using Java Web Start and Java Plug-in.
• Preparation for Java Programming Language Certification — List of available training and tutorial resources.

Creating Graphical User Interfaces

• Creating a GUI with Swing — A comprehensive introduction to GUI creation on the Java platform.
• Creating a JavaFX GUI — A collection of JavaFX tutorials.

Specialized Trails and Lessons

These trails and lessons are only available as web pages.

• Custom Networking — An introduction to the Java platform’s powerful networking features.
• The Extension Mechanism — How to make custom APIs available to all applications running on the Java platform.
• Full-Screen Exclusive Mode API — How to write applications that more fully utilize the user’s graphics hardware.
• Generics — An enhancement to the type system that supports operations on objects of various types while providing compile-time type safety. Note that this lesson is for advanced users. The Java Language trail contains a Generics lesson that is suitable for beginners.
• Internationalization — An introduction to designing software so that it can be easily adapted (localized) to various languages and regions.
• JavaBeans — The Java platform’s component technology.
• JAXB — Introduces the Java architecture for XML Binding (JAXB) technology.
• JAXP — Introduces the Java API for XML Processing (JAXP) technology.
• JDBC Database Access — Introduces an API for connectivity between the Java applications and a wide range of databases and data sources.
• JMX— Java Management Extensions provides a standard way of managing resources such as applications, devices, and services.
• JNDI— Java Naming and Directory Interface enables accessing the Naming and Directory Service such as DNS and LDAP.
• Reflection — An API that represents («reflects») the classes, interfaces, and objects in the current Java Virtual Machine.
• RMI — The Remote Method Invocation API allows an object to invoke methods of an object running on another Java Virtual Machine.
• Security — Java platform features that help protect applications from malicious software.
• Sockets Direct Protocol — How to enable the Sockets Direct Protocol to take advantage of InfiniBand.
• Sound — An API for playing sound data from applications.
• 2D Graphics — How to display and print 2D graphics in applications.

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Trail: Learning the Java Language

This trail covers the fundamentals of programming in the Java programming language.

Object-Oriented Programming Concepts teaches you the core concepts behind object-oriented programming: objects, messages, classes, and inheritance. This lesson ends by showing you how these concepts translate into code. Feel free to skip this lesson if you are already familiar with object-oriented programming.

Language Basics describes the traditional features of the language, including variables, arrays, data types, operators, and control flow.

Classes and Objects describes how to write the classes from which objects are created, and how to create and use the objects.

Annotations are a form of metadata and provide information for the compiler. This lesson describes where and how to use annotations in a program effectively.

Interfaces and Inheritance describes interfaces—what they are, why you would want to write one, and how to write one. This section also describes the way in which you can derive one class from another. That is, how a subclass can inherit fields and methods from a superclass. You will learn that all classes are derived from the Object class, and how to modify the methods that a subclass inherits from superclasses.

Numbers and Strings This lesson describes how to use Number and String objects The lesson also shows you how to format data for output.

Generics are a powerful feature of the Java programming language. They improve the type safety of your code, making more of your bugs detectable at compile time.

Packages are a feature of the Java programming language that help you to organize and structure your classes and their relationships to one another.

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Oracle программирование языке java

Oracle. Программирование на языке Java.

Авторы — Мартин К. Соломон, Нирва Мориссо-Леруа, Джули Басу

Главная тема книги Мартина Соломона, Нирвы Мориссо-Леруа и Джули Басу «Oracle: Программирование на языке Java» — разработка приложений баз данных на основе компонентов Java с использованием Enterprise JavaBeans (EJBs), CORBA и JavaServer Pages (JSPs). В частности, вы научитесь разрабатывать, внедрять и настраивать многоуровневые приложения БД с помощью реализаций JDBC и SQLJ. Несмотря на то что прикладные программы, здесь представленные, были созданы для работы в базах данных Oracle версий 8.хх и выше, с небольшими изменениями их можно использовать в любой основанной на SQL, т.е. «чистой» реляционной или объектно-реляционной системе управления БД (DBMS — Database Management System).

Это именно та книга, которая позволит быстро и эффективно строить масштабируемые Интернет-приложения с использованием Java и Oracle. В первой части рассматривается стиль программирования на основе компонентов — очень эффективный метод написания модульных и удобных в обслуживании приложений, а также дается общий обзор процесса разработки приложений с помощью компонентов EJB, CORBA и JSP. В трех следующих частях подробно рассказано о EJB, CORBA и JSP. В начале каждой части дано краткое общее представление о том или ином компоненте, затем рассматриваются более частные вопросы программирования.

Книга написана отлично, и переходить от главы к главе очень просто, к тому же теория поясняется многочисленными примерами. Взятые из современной практики, они показывают, как с помощью компонентов Java грамотно разрабатывать приложения баз данных уровня предприятия в пошаговом режиме.

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