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The Java Technology

Talk about Java technology seems to be everywhere, but what exactly is it?

The following sections explain how Java technology is both a programming language and a platform, and provide an overview of what this technology can do for you


Java Technology

Java technology is both a programming language and a platform.


The Java Programming Language

The Java programming language is a high-level language that can be characterized by all of the following buzzwords:

πŸ‘‰πŸ» SimpleπŸ‘‰πŸ» Architecture Neutral
πŸ‘‰πŸ» Object orientedπŸ‘‰πŸ» Distributed
πŸ‘‰πŸ» MultithreadedπŸ‘‰πŸ» Dynamic
πŸ‘‰πŸ» Architecture neutralπŸ‘‰πŸ» Portable
πŸ‘‰πŸ» High performanceπŸ‘‰πŸ» Robust
πŸ‘‰πŸ» Secure

Each of the preceding buzzwords is explained in The Java Language Environment , a white paper written by James Gosling and Henry McGilton in May 1996.


The Java Platform

A platform is the hardware or software environment in which a program runs.Most platforms can be described as a combination of the operating system and underlying hardware. The Java platform differs from most other platforms in that it's a software-only platform that runs on top of other hardware-based platforms.

The Java platform has two Components:

  • The Java Virtual Machine
  • The Java Application Programming Interface (API)

The Java Virtual Machine is the base for the Java platform and is ported onto various hardware-based platforms.

The Java Application Programming Interface( API ) is a large collection of ready-made software components that provide many useful capabilities. It is grouped into libraries of related classes and interfaces; these libraries are known as packages.


What Can Java Technology Do?

The general-purpose, high-level Java programming language is a powerful software platform. Every full implementation of the Java platform gives you the following features:

  • Development Tools: The development tools provide everything you'll need for compiling, running, monitoring, debugging, and documenting your applications. As a new developer, the main tools required are the javac compiler, the java launcher, and the javadoc documentation tool.

  • Application Programming Interface (API): The API provides the core functionality of the Java programming language. It offers a wide array of useful classes ready for use in applications. It spans everything from basic objects, to networking and security, to XML generation and database access, and more.

  • Deployment Technologies: The JDK software provides standard mechanisms such as the Java Web Start software and Java Plug-In software for deploying applications to end users.

  • User Interface Toolkits: The JavaFX, Swing, and Java 2D toolkits make it possible to create sophisticated Graphical User Interfaces (GUIs).

  • Integration Libraries: Integration libraries such as the Java IDL API, JDBC API, Java Naming and Directory Interface (JNDI) API, Java RMI, and Java Remote Method Invocation over Internet Inter-ORB Protocol Technology (Java RMI-IIOP Technology) enable database access and manipulation of remote objects.

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Key Features of the Java LanguageJava is simpler than most other languages that are used to create server applications because of its consistent enforcement of the object model.Chaining Constructor using SuperIf a subclass constructor invokes a constructor of its superclass either explicitly or implicitly there will be a whole chain of constructors called all the way back to the constructor of Object.Multilevel Inheritance in JavaMultilevel Inheritance is said to have taken place when a child class inherits from a parent class and then child class becomes the parent class for another class.Interface Inheritance JavaAn Interface declaration consists of modifiers the keyword interface the interface name a comma separated list of parent interfaces and the interface body.Inheritance in JavaA class that is derived from another class is called a subclass. The class from which the subclass is derived is called a superclass. This process of inheriting properties from another class is called Inheritance.White Spaces in JavaWhite Space is a character in Java. A character satisfies to be a White Space if and only if it is a Unicode space character.Serialization and Deserialization JavaTo serialize an object means to convert its state to a byte stream so that the byte stream can be reverted back into a copy of the object.Implementations in Collection FrameworkImplementations are the data objects used to store collections, which implement the interfaces described in the Interfaces section.Package javax.servlet.http Class Cookie MethodA cookies value can uniquely identify a client so cookies are commonly used for session management.

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