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Java Web Start: Launch Applications with Java 2 Technology


How to Download Java 2.0




Java is one of the most popular and widely used programming languages in the world. It is a general-purpose, object-oriented, platform-independent, and secure language that can run on any operating system that supports the Java Virtual Machine (JVM). Java is used for developing desktop, web, mobile, and embedded applications.


Java 2.0 is a major release of the Java platform that was launched in December 1998 by Sun Microsystems (now Oracle). It introduced many new features and enhancements to the language and the libraries, such as inner classes, collections framework, reflection, swing, RMI, JDBC, servlets, JSP, and EJB.




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In this article, we will explain what is Java 2.0, what are its features, benefits, disadvantages, and alternatives. We will also show you how to download and install Java 2.0 on your computer, how to verify the installation, and how to uninstall it if needed.


What is Java 2.0?




Java 2.0 is the second version of the Java platform that was released in December 1998 by Sun Microsystems (now Oracle). It was also known as JDK (Java Development Kit) 1.2 or J2SE (Java 2 Standard Edition). It was a major update that added many new features and improvements to the language and the libraries.


Features of Java 2.0




Some of the main features of Java 2.0 are:


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  • Inner classes: Inner classes are classes that are defined inside another class or interface. They can access the members of the enclosing class or interface and can have different access modifiers than the outer class or interface.



  • Collections framework: Collections framework is a set of interfaces and classes that provide a unified way of storing and manipulating groups of objects. It includes interfaces such as Collection, List, Set, Map, Queue, etc., and classes such as ArrayList, LinkedList, HashSet, HashMap, PriorityQueue, etc.



  • Reflection: Reflection is a feature that allows a program to inspect and manipulate its own structure and behavior at runtime. It can be used to create objects dynamically, invoke methods, access fields, modify annotations, etc.



  • Swing: Swing is a graphical user interface (GUI) toolkit that provides a rich set of components for creating desktop applications. It is based on the Abstract Window Toolkit (AWT) but provides more features and flexibility than AWT. It includes components such as buttons, labels, text fields, menus, tables, trees, dialogs, etc.



  • RMI: RMI (Remote Method Invocation) is a mechanism that allows a Java program to invoke methods on an object that resides in another JVM (Java Virtual Machine) on a different machine. It uses object serialization and TCP/IP protocols to communicate between JVMs.



  • JDBC: JDBC (Java Database Connectivity) is an API (Application Programming Interface) that allows a Java program to connect to various types of databases and execute SQL statements. It provides a uniform way of accessing different kinds of data sources such as relational databases, spreadsheets, flat files, etc.



  • Servlets: Servlets are Java classes that run on a web server and handle HTTP requests from clients. They can generate dynamic web content such as HTML pages, images, etc., based on the request parameters and data from databases or other sources.



  • JSP: JSP (Java Server Pages) are files that contain a mixture of HTML and Java code that are processed by a web server and converted into servlets. They can use the same features as servlets to generate dynamic web content, but they are easier to write and maintain.



  • EJB: EJB (Enterprise JavaBeans) are server-side components that encapsulate the business logic and data of an enterprise application. They can be accessed by clients using various protocols such as RMI, CORBA, HTTP, etc. They provide services such as transaction management, security, concurrency, persistence, etc.



Benefits of Java 2.0




Some of the benefits of Java 2.0 are:


  • Portability: Java 2.0 is platform-independent, meaning that it can run on any operating system that supports the JVM. This makes it easy to develop and deploy applications across different environments without worrying about compatibility issues.



  • Performance: Java 2.0 is faster and more efficient than the previous versions of Java. It has improved the performance of the JVM, the garbage collector, the compiler, and the libraries. It also supports native methods, which are methods written in other languages such as C or C++ that can be invoked from Java code.



  • Scalability: Java 2.0 is scalable, meaning that it can handle large and complex applications with ease. It supports distributed computing, which allows a program to run on multiple machines and communicate with each other. It also supports multithreading, which allows a program to execute multiple tasks concurrently.



  • Reliability: Java 2.0 is reliable, meaning that it can handle errors and exceptions gracefully without crashing or corrupting the data. It has a robust exception handling mechanism, which allows a program to catch and handle errors at runtime. It also has a strong type system, which prevents type mismatch errors at compile time.



  • Security: Java 2.0 is secure, meaning that it can protect the data and the code from unauthorized access or modification. It has a sandbox model, which restricts the access of untrusted code to the system resources. It also has a security manager, which enforces a set of security policies on the code.



  • Modularity: Java 2.0 is modular, meaning that it can be divided into smaller and reusable units of code. It supports packages, which are groups of related classes and interfaces that can be imported and used by other classes. It also supports jar files, which are compressed files that contain one or more packages and other resources.



Disadvantages of Java 2.0




Some of the disadvantages of Java 2.0 are:


  • Complexity: Java 2.0 is complex, meaning that it has many features and concepts that can be difficult to learn and master. It requires a lot of coding and debugging to create and maintain applications. It also has some limitations and drawbacks such as verbosity, memory consumption, lack of multiple inheritance, etc.



  • Compatibility: Java 2.0 is not fully compatible with the previous versions of Java, meaning that some features and libraries may not work or behave differently in Java 2.0. This can cause problems when migrating or integrating applications from different versions of Java.



  • Availability: Java 2.0 is not widely available, meaning that it may not be supported by some browsers, devices, or platforms. This can limit the reach and accessibility of applications developed in Java 2.0.



Alternatives to Java 2.0




Some of the alternatives to Java 2.0 are:


  • C#: C# is a general-purpose, object-oriented, platform-independent language that was developed by Microsoft as part of the .NET framework. It has many similarities with Java but also some differences such as properties, delegates, events, generics, LINQ, etc.



  • Python: Python is a general-purpose, interpreted, high-level language that supports multiple paradigms such as object-oriented, functional, procedural, etc. It has a simple and expressive syntax that makes it easy to read and write code. It also has a large and rich set of libraries for various domains such as web development, data science, machine learning, etc.



Ruby: Ruby is a general-purpose, interpreted, high-level language that supports m


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