Java course in Chandigarh

1. Java course in Chandigarh Excellence Technology is one of the top Certified Software Development and Industrial Training Company in Chandigarh and Mohali. Students who have interest in programming languages like Java or .Net. For that Students Excellence provides Full Stack Development course in Chandigarh. Java is a widely used object- oriented programming language. Excellence Technology offer Java course in Chandigarh With 100% job placement.

2. Java Java is a widely used object-oriented programming language and software platform that runs on billions of devices, including notebook computers, mobile devices, gaming consoles, medical devices and many others. The rules and syntax of Java are based on the C and C++ languages. Java is the official language for Android mobile app development. In fact, the Android operating system itself is written in Java. Even though Kotlin has recently become an alternative to using Java for Android development, Kotlin still uses the Java Virtual Machine and can interact with Java code. Java Technology and Its Uses Java is a programming language and computing platform first released by Sun Microsystems in 1995. It has evolved from humble beginnings to power a large share of today's digital world, by providing the reliable platform upon which many services and applications are built. While most modern Java applications combine the Java runtime and application together, there are still many applications and even some websites that will not function unless you have a desktop

3. Java installed. Java.com, this website, is intended for consumers who may still require Java for their desktop applications – specifically applications targeting Java 8. Developers as well as users that would like to learn Java programming should visit the dev.java website instead and business users should visit oracle.com/java for information. more Programming Languages There are four platforms of the Java programming language: Java Platform, Standard Edition (Java SE) Java Platform, Enterprise Edition (Java EE) Java Platform, Micro Edition (Java ME) Java FX. All Java platforms consist of a Java Virtual Machine (VM) and an application programming interface (API). The Java Virtual Machine is a program, for a particular hardware and software platform, that

4. runs Java applications. An API is a collection of software components that you can use to create other software components or applications. Each Java platform provides a virtual machine and an API, and this allows applications written for that platform to run on any compatible system with all the advantages of the Java programming language: platform-independence, power, stability, ease-of-development, and security. Java SE When most people think of the Java programming language, they think of the Java SE API. Java SE's API provides the core functionality of the Java programming language. It defines everything from the basic types and objects of the Java programming language to high-level classes that are used for networking, security, database access, graphical user interface (GUI) development, and XML parsing. In addition to the core API, the Java SE platform consists of a virtual machine, development tools, deployment technologies, and other class libraries and toolkits commonly used in Java applications. Java EE The Java EE platform is built on top of the Java SE platform. The Java EE platform provides an API and runtime environment for developing and running large-scale, multi-tiered, scalable, reliable, and secure network applications. Java ME The Java ME platform provides an API and a small-footprint virtual machine for running Java programming language applications on small devices, like mobile phones. The API is a subset of the Java SE API, along with special class libraries useful for small device application development. Java ME applications are often clients of Java EE application services.

5. Java Platform and Java Community Process Java Standard Edition and Java Enterprise Edition are heavily used worldwide. Together, they are used in various kinds of solutions like web applications, applications servers, big data technologies and so on. Both editions are composed of a large number of modules and it wouldn't be possible to provide a thorough explanation of the whole platform. Therefore, I'm going to briefly address its most important pieces. Java Standard Edition (Java SE) The Java Standard Edition (Java SE) is the minimum requirement to run a Java application. This edition provides a solid basis to the Java Enterprise Edition, and as such I will start by defining some of its components: Java Virtual Machine (JVM) Java Class Library (JCL) Java Runtime Environment (JRE) Java Development Kit (JDK) Java Virtual Machine (JVM) The Java Virtual Machine (JVM) is responsible for supporting the execution of Java applications. This is the piece of the

6. platform everywhere true for Java. Each particular host operating system (Windows, Linux, Mac OS, etc) needs its own implementation of the JVM, otherwise it wouldn't be possible to run Java applications. that makes the statement write once, run Let's take as an example an arbitrary application that needs to read files from the hosting system. If this application didn't run on an engine like the JVM, like IO operations, it would be necessary to write a different program to every single system targeted. This would make the release process slower and it would become harder to support and share this application. that abstracts tasks One important concept to bare in mind is that the JVM is, before everything, a specification. Being a specification allows different vendors to create their own implementation of the JVM. Wikipedia has an up to date article that lists open source and proprietary JVMs, but the most important and used ones are: Open JDK (which is open source), J9 from IBM and Oracle JVM (both proprietary). Java Class Library (JCL) The Java Class Library is a set of standard libraries that is available to any application running on the JVM. This set of libraries is composed of classes that allow programs to handle commons tasks like: network communication, collection

7. manipulation, file operations, user interface creation, etc. This standard library is also known as the Java Standard Edition API. As of version 8 of Java, there were more than 4 thousand classes available to the applications running on the JVM. This makes a typical installation of Java consume a large size on disk. Java Runtime Environment (JRE) The Java Runtime Environment (JRE) is a set of tools that provide an environment where Java applications can run effectively. Whenever a user wants to run a Java program, they must choose a vendor and install one of the versions available for their specific environment architecture (Linux x86, Linux x64, Mac OS X, Windows x64, etc). Installing it gives them access to a set of files and programs. There typical JRE installation. The first one is the java executable file. This file is responsible for bootstrapping the JVM that will run the application. The second one is the rt.jar file. This file contains all the runtime classes that comprises the JCL. are two files that are worth noting on a

8. Java Development Kit (JDK) The Java Development Kit (JDK) is an extension of the JRE. Alongside with the files and tools provided by the JRE, the JDK includes compilers and tools (like JavaDoc, and Java Debugger) to create Java programs. For this reason, whenever one wants to develop a Java application, they need to install a JDK. Nowadays, tools distributed by the JDK, that focus on compiling and basic source code debugging, are often not directly used by developers. Usually Java developers rely on third party tools (like Apache Maven or Gradle) to automate compile, build, and distribution processes. And they also rely on their IDEs (Integrated Development Environments) to build and debug projects on a development environment. Nevertheless, it is important to note that there are very important tools that help developers on finding and solving bugs, in production and on development stages, that are available on the JDK. JVisualVM is one of these tools. Developers use it to visually monitor, troubleshoot, and profile Java applications. Java Enterprise Edition (Java EE) The Java Enterprise Edition (Java EE) was created to extend the Java SE by adding a set of specifications that define capabilities commonly used by enterprise applications. The latest version of this edition contains over 40 specifications that help developers to create applications that communicate services, convert object-oriented relationship model, handle conversations and so on. through data web entity to transactional

9. One great advantage of having an enterprise edition defined as specifications, is that different vendors can develop their own application servers to support it. This leads to a richer environment where companies can choose the best vendor to support their operations (i.e. they avoid vendor lock-in), and allows open-source and commercial versions of these specifications to be developed and used in a highly compatible way. Java Enterprise Edition Vendors At the time of writing there are 8 different vendors that certified their Java EE implementation. Among these vendors, two of them are free and open-source: GlassFish Server Open Source Edition and WildFly. Oracle, the creator of GlassFish, and Red Hat, the creator of WildFly, also provide proprietary and paid versions of these application servers. Oracle WebLogic Server is the version supported by Oracle and JBoss Enterprise Application Platform is the version supported by Red Hat. One may wonder why companies like Oracle and Red Hat make available two versions of their applications servers: one open-source and free and the other paid and proprietary. The biggest differences between these versions are that the paid ones usually have more performance and better support. Vendors invest a lot to make these versions run smoothly and to solve any issues that might occur as fast as possible. Java Enterprise Edition Features As already stated, Java EE comes with a lot (more than 40) features based on JSRs. These features help companies to handle common needs like persistence, security, web interfaces, state validation and so on. The following list

10. enumerates some of the most important and used features of Java EE: Java accessing, persisting and managing data between Java objects and a relational database Java Server Faces (JSF)—a specification for building component-based user interfaces for web applications Java Server Pages (JSP)—a technology that helps software developers create dynamically generated web pages based on HTML Java API for RESTful Web Services (JAX-RS)—a spec that provides support in creating RESTful web services Enterprise Java Beans (EJB)—a developing components that encapsulates business logic of an application Context and Dependency Inject (CDI)—a technology that allows developers to apply inversion of control on Java applications Persistence API (JPA)—a specification for specification for Java Community Process (JCP) The Java Community Process (JCP) is the process that formalizes and standardizes Java technologies. Interested parties, like developers and companies, cooperate in this process to evolve the platform. Enhancements to any Java technology or introduction of new ones occur through Java Specification Requests (JSRs). A description of the proposed specification The target platform Why the need for a new specification And technologies that the specification relied on After submitting this specification request, members of the Executive Committee (EC) analyzed it to decide if the request deserved attention or not. Since it was approved by the EC, Mark Hadley and Paul Sandoz—former employees of Sun Microsystems—were assigned as Specification Leads and

11. kept working on it with the help of Expert Group members and Contributors. All the different roles and the workflow involved to release any JSR, like the example the JCP program and are governed by the EC. above, are defined in Java Community Process Membership To officially participate in any stage of a JSR or process in the JCP, an organization or individual has to sign a Java Specification Participation Agreement (JSPA), a Associate Membership Agreement (AMA) or a Partner Membership Agreement (PMA). Any entity (human or organization) that signs one of these agreements gets categorized as one of the three types of JCP Membership available: Associate Member, Partner Member or Full Member. Each of these types qualify members to act on different roles in the process. The JCP provides a very detailed explanation of how different kind of subjects (individuals, non-profit organizations or commercial organizations) become members and how they can contribute. But basically, the following rules apply: Associate Members can be Contributors to JSRs' Expert Groups, attend JCP Member events and vote in the annual Executive Committee elections for two Associate seats. Partner Members can serve on the Executive Committee, attend to JCP Member events and vote in the annual Executive Committee elections. Full Members can work on the Executive Committee, vote in the annual Executive Committee elections, work as Contributors to JSRs and lead these specifications. Java Specification Requests (JSR)

12. A Java Specification Request is the document that starts an enhancement on the Java platform. Whenever a member of the JCP program sees an opportunity to improve the platform, they create a JSR describing the opportunity and submit it for revision. The JSR then passes through a series of stages until it gets released or discarded. The following list enumerates the stages from the creation of a JSR to its release: Write a JSR Submit a JSR JSR Review EG formation Early Draft Review Public Review Proposed Final Draft Final Ballot Advantages of Java Language- Java is easy to learn. Java was designed to be easy to use and is therefore easy to write, compile, debug, and learn than languages. Java is object-oriented. This allows you to create modular programs and reusable code. Java is platform-independent. One of the most significant advantages of Java is its ability to move easily from one computer system to another. The ability to run the same program on many different systems is crucial to World Wide Web software. other programming

13. Java succeeds at this by being platform- independent at both the source and binary levels. Disadvantages of Java Language- Performance Java programs take much longer time to run compared to C/C++. Memory Since Java Programs run on top of Java Virtual Machine, it consumes more memory. Cost Since memory and processing requirements higher, hardware cost increases. Low level programming There is no support for low level programming in Java, like pointers are missing. Garbage collection There is no control over garbage collection in Java. That is programmer does not have any right to control the garbage collection. Java does not provide functions like delete(),free(). No Unsigned Types Unlike C/C++, Java does not support unsigned int, unsigned char etc. Beside all above disadvantages, Java is one of the most used language in the software industry.

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