Java Application Development

Java - The Reason Behind Its Never Ending Demand

Agenda

•Introduction•Features•Why it is

popular•Conclusion

Introduction

James Gosling developed Java at Sun Microsystems which was later subsidized by the Oracle Corporation. Java is a programming language; it was released in the year 1995.

Most programming languages are platform dependent that is they run on a particular environment say Windows XP, Vista, and UNIX etc.

Why It Is Popular

If a program has been written in a certain programming language in a Windows XP environment, the same program will not run in a MAC OS.

This created a credible hindrance in encoding high level programs, as they had to be coded for different platforms individually, which required a lot of man power, time and funds.

How To Deal With Java

To deal with such a glitch, Java was developed. It is completely platform independent and Java programs can run on any machine as long as the Java Virtual machine (JVM) is installed in it.

JVM is the interface used to make Java platform independent. As long as a machine has JVM installed in it, it is capable of running any Java program. Java is an object oriented programming language.

Conti…

Most of its syntax is similar to that

of the C and C++ programming languages. The class libraries and compilers of Java had been created and developed by Sun Microsystems as well along with the introduction of this programming language in 1995.

Feature Of Java As discussed above, one of the basic and most important features of

Java is its portability.

This property is achieved because, when the programs written in Java are compiled, they do not get converted into machine code. Instead they are converted into Java byte code.

This feature is unique to Java and acts as a building block towards

Java's portability property.

Conti..

Memory management is another feature of Java that has helped in popularizing this programming language.

The garbage collector in Java is responsible for managing memory. The garbage collector runs automatically and does not need any explicit command.

How It Works?

The byte code is compiled into machine code during run time by the Just In Time compiler or JIT.

his byte code is then interpreted by the JVM. The program is run on a Java Runtime Environment (JRE). JRE is used for Java applications and applets.

A Series Of Activities

Java provides a series of activities including, threading, networking and even graphical features via applets.

Java programs are very slow due to the fact that they are first converted into byte code and then into machine code.

They also require a lot of storage memory space. The speed of Java programs has been increased to great lengths with the use of JIT.

Conti..

A few platforms have microcontrollers in their hardware systems. These microcontrollers are capable of running a Java program without the presence of an interface. That is they do not require JVM in order to run programs written in Java.

Conclusion

Objects are created with every Java program as it is an object

oriented programming language, the garbage collector frees the memory from objects which are not required or which will not be required. In order to check whether an object is required or not its recent references are checked.

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