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Basic Introduction of Java, History and Features of Java

Basic Introduction of Java – QuantaInfotech.com

Introduction of JAVA
  • Java is a popular and powerful language. Although it is a very simple language.
  • It is an object-oriented programming language (OOP) with a built-in API(Application Programming Interface) that can handle GUI.
  • Much of the syntax of Java is similar to C and C++, major difference is java doesn’t have pointers.
  • Using Java we can create Android Application, Web Applications, Windows Applications
History of Java
  • Java was developed by James Gosling, who is known as the father of Java, in 1995 at Sun Microsystems (which is now a subsidiary of Oracle Corporation).
  • Initially designed for small, embedded systems in electronic appliances like set-top boxes
  • Currently, Java is used in internet programming, mobile devices, games, e-business solutions, etc.
  • Firstly, it was called “Greentalk” by James Gosling, and the file extension was .gt.
  • After that, it was called Oak and was developed as a part of the Green project.
  • Why Oak? Oak is a symbol of strength and chosen as a national tree of many countries like the U.S.A., France, Germany, Romania, etc
  • In 1995, Oak was renamed as “Java” because it was already a trademark by Oak Technologies.
  • Java is an island of Indonesia where the first coffee was produced (called java coffee). Java name was chosen by James Gosling while having coffee near his office.

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Features
  • High level Language – It is high level language similar to C and C++ but has many unique features.
  • Java BytecodeBytecode in java is an intermediate code generated by the compiler such as javac, executed by JVM.
  • JAVA Virtual Machine (JVM)JVM acts asan interpreter for the Bytecode, which takes bytecodes as input and execute.Java source code

Java Virtual Machine (JVM)

  • A Java virtual machine is a virtual machine that enables a computer to run Java programs.
  • Java Bytecode execute on a virtual machine
  • Most programming languages compile the source code directly into machine code, the difference with java is that is uses bytecode, an intermediate code.
  • JVM is responsible for allocating the necessary memory needed by the Java program.
  • The JVM performs following operation:
    • Loads code
    • Verifies code
    • Executes code
    • Provides runtime environment
Features of Java
  • Platform Independent
  • Object Oriented
  • Both compiler and interpreter
  • Java is Robust
  • Security Features
  • Java is multithread
  • Automatic Memory Management
Difference between Java and C++
  • Multiple Inheritance Not Allowed –
  • Common Parent – All classes are single rooted. The class object is parent of all classes in java.
  • All Codes inside ClassAlso Global declaration outside of Class not allowed.
  • go toinstead of go to, break and continue supported
  • Pointers – No pointers in java
  • Automatic Variable InitialisationAll variable automatically initialized, except local variable.

Chapter 1 – Basic Introduction of Java

 


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