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Java Features or Buzz Words:
1. Simple
2. Secure
3.Portable
4.Object-oriented
5.Robust
6.Multithreaded
7.Architecture-neutral
8.Interpreted
9.High performance
10.Distributed
11.Dynamic
We discuss about these words how java supported.
Simple: java is simple to write program and easy to learn if you understand the basics of OOP. Because it was acquire some object oriented features from C/C++ languages.
Secure: Java is secured programming language with its secure features and it enables to develop threat/virus free systems. Java is intended to work in networked and distributed environments by providing security. All the references to memory are symbolic references, meaning that the user is not aware where in the memory program is present, it totally depends on the JVM and Machine on which the program is running. Java is strongly typed language which means that variables should be declared and variables should not change types.
Portable: Java is portable because its architectural neutral and having no implementation of dependent aspects of the specification.
Architectural- Neutral: Java compiler generates an object file format which is executable on many processors, with java runtime. This makes java is Architectural Neutral.
Object oriented: Java is a pure object oriented programming language. In java everything is represented in an object form. Java can be easily extended since it is based on object model.
Robust: Java provides checking for possible problems at two levels, one at compile time and the other at the run time, so programmers are highly reliable and eliminate situations that are error-prone compared to other programming languages like c/c++. Java provides powerful and robust exception handling mechanism which to deal with both checked and unchecked exceptions.
Multithreaded: Before answering what is multithreading, let me explain you what ‘thread’ is. Simply, a thread is a program’s path of execution. In your problems, when multiple events or actions need to occur at the same time, how you will handle it? For example, a program is not capable of drawing pictures when you keep pressing keys of the keyboard. The program gives its full attention to receiving the keyboard input and doesn’t draw the picture properly. The best solution to this problem is the execution of two or more sections of a program at the same time and this technique is known as multithreading.
It is an ability to execute more than one program concurrently or simultaneously. Java is inherently multi-threaded, for example garbage collection subsystem runs as alow-priority thread. A single Java program can have many different threads executing independently and continuously, for example, different Java applets on the same web page can run together with getting equal time from the processor. Because multithreaded applications share data and all threads of an application exists in the same data space therefore to maintaining reliability is sometime difficult. To making easy the use of threads Java offers features for synchronization between threads.
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.
Distributed: Java is designed for the distributed environment of the internet.
High Performance: As we know in Java we have to first compile the program, then execute it using Java
Interpreter. In general, interpreters are slow, because an interpreter executes programs instruction by instruction while Java is a fast-interpreted language. Java has also been designed so that the run-time system can optimize their performance by compiling byte code to native machine code on the fly (execute immediately after compilation).
This is called “just in time” (JIT) compilation.
Platform Independent: Java is Platform independent. The meaning of platform here may be confusing for you but actually this word is poorly defined. In the computer industry it typically means some combination of hardware and system software but here you can understand it as your operating system. Java is compiled to an intermediate form called Java byte-code or simply byte code. A Java program never really executes immediately after compilation on the host machine. Rather, this special program called the Java interpreter or Java Virtual Machine reads the byte code, translates it into the corresponding host machine instructions and then executes the machine instruction. A Java program can run on any computer system for which a JVM (Java Virtual Machine) and some library routines have been installed. The second important part which makes Java portable is the elimination of hardware architecture dependent constructs. For example, Integers are always four bytes long and floating-point variables follow the IEEE 754.You don’t need to worry that the interpretation of your integer is going to change if you move from one hardware to another hardware like Pentium to a PowerPC. You can develop the Java program on any computer system and the execution of that program is possible on any other computer system loaded with JVM. Java is a rich programming language.
