![Java is a high-level programming language was originally
developed by Sun Microsystems, which was initiated by James
Gosling and released in 1995 as core component of Sun
Microsystemss Java platform (Java 1.0 [J2SE]).
Initially they called it oak "after seeing an oak tree
But after some time, it was renamed to Java based on the name
of coffee
With the advancement of Java and its widespread popularity,
multiple configurations were built to suite various types of
platforms.
Ex:1) J2EE for Enterprise Applications,
2)J2ME for Mobile Applications.](https://image.slidesharecdn.com/chap1-240607183047-997b86e0/85/Introduction-to-Core-Java-feature-and-its-characteristics-2-320.jpg)
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Introduction to Core Java feature and its characteristics
- 2. Java is a high-level programming language was originally developed by Sun Microsystems, which was initiated by James Gosling and released in 1995 as core component of Sun Microsystemss Java platform (Java 1.0 [J2SE]). Initially they called it oak "after seeing an oak tree But after some time, it was renamed to Java based on the name of coffee With the advancement of Java and its widespread popularity, multiple configurations were built to suite various types of platforms. Ex:1) J2EE for Enterprise Applications, 2)J2ME for Mobile Applications.
- 3. Java comes in two variants- A)Java Runtime Engine(jre) B)Java Software Development Kit(jdk) JRE is essentially runtime environment consisting of bytecode interpreter,JVM ands set of basic libraries to support Java Language feature The Java SDK is further bundled into two separate packages I)Java 2Standard Edition(J2SE)supports most of the features and libraries required to build a full feature Java application 2)Java2Enterprise edition(J2EE)provides advance feature like native interface,Java Server Page etc.
- 4. JAVA IS Simple similar to C/C++ Scalable i.e easy to integrate Object oriented i.e able to program real life complexities Strongly typed language i.e it clearly distinguishes between the compile time errors that must be detected at compile time and those that occurs at runtime
- 5. Java is both COMPILED as well as INTERPRETED i.e Java compiled Java Byte Code(an intermediate code) run on interpreter execute a program
- 6. Java is guaranteed to be Write Once, Run Anywhere
- 7. Basic features of java(Buzzwords) Object Oriented : In java everything is an Object. Java can be easily extended since it is based on the Object model. Platform independent: Unlike many other programming languages including C and C++ when Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual Machine (JVM) on whichever platform it is being run. Simple :Java is designed to be easy to learn. If you understand the basic concept of OOP java would be easy to master. Secure : With Javas secure feature it enables to develop virus-free, tamper-free systems. Authentication techniques are based on public-key encryption.
- 8. Architectural- neutral :Java compiler generates an architecture-neutral object file format which makes the compiled code to be executable on many processors, with the presence Java runtime system. Portable :being architectural neutral and having no implementation dependent aspects of the specification makes Java portable. Compiler and Java is written in ANSI C with a clean portability boundary. Robust :Java makes an effort to eliminate error prone situations by emphasizing mainly on compile time error checking and runtime checking. Multi-threaded : With Javas multi-threaded feature it is possible to write programs that can do many tasks simultaneously. This design feature allows developers to construct smoothly running interactive applications.
- 9. Interpreted :Java byte code is translated on the fly to native machine instructions and is not stored anywhere. The development process is more rapid and analytical since the linking is an incremental and light weight process. High Performance: With the use of Just-In-Time compilers Java enables high performance. Distributed :Java is designed for the distributed environment of the internet. Dynamic : Java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time
- 10. For remembering Basic features is OPSSAPRMIHDD
- 11. History of java James Gosling initiated the Java language project in June 1991 for use in one of his many set-top box projects. The language, initially called Oak after an oak tree that stood outside Gosling's office, also went by the name Green and ended up later renamed as Java, from a list of random words. Sun released the first public implementation as Java 1.0 in 1995. It promised Write Once, Run Anywhere (WORA), providing no-cost run- times on popular platforms. On 13 November 2006, Sun released much of Java as free and open source software under the terms of the GNU General Public License (GPL). On 8 May 2007 Sun finished the process, making all of Java's core code free and open-source, aside from a small portion of code to which Sun did not hold the copyright.
- 12. JAVA VIRTUAL MACHINE CONCEPT Java compiler Java interpreter for window Java interpreter for macintosh Java interpreter for linux Java program Byte code Java is machine independent and Architectural neutral
- 13. Java program compiled And converted into Byte code interpreter Machine instruction
- 14. Java is machine independent and architectural neutral Java interpreter is a part of java runtime environment Program in java run time environment ,which is used to interpret byte code , is called java virtual machine(JVM). The java compiler reads java language source files , translates the source into java byte codes and places the bye codes into class file Any machine for which java interpreter is available can execute this byte code
- 15. Layers of interactions for java programs Real machine Operating system Java virtual machine Java object framework(API) compiler interpreter User Application Program users
- 16. The JVM includes: A)Byte Code Loader: will pick up the byte code file(.class) ->this byte code is then verified to ensure that it can execute correctly without violating any of Javas rule or security consideration. Any byte code file failing is rejected at this point B)Java Interpreter:It translates the byte code files into executable instructions for the type of computer hardware and operating system the local computer is using The java object framework(java API) acts as the intermediary between the users programs and the virtual machine which in turn acts as the intermediary between the operating system and the java object framework. Validated Byte code