Awesome quotes

●"If friendship is ur weakest point :: then u r the strongest prsn in the world ".....¿♧□♤♡♢...!
●"If u want to be happy.....¿☆♡ then start by making other's happy"

THE JAVA LANGUAGE AND ITS EVOLUTION

Features (or) aspects	C language	C++ language	Java
Successor of	BCPL	C	C &C++
Pointers	supports	supports	Not support
Storage classes: auto, extern	support	support	Not support
template	Not support	support	Not support
DMA functions	malloc(), calloc(),    realloc(),  free()	new, delete	Garbage collectors
destructor	Not support	support	Not support
Database connectivity	Not support	Not support	support
Exception handler	Not support	support	support

 

                                                                                                UNIT-1

Chapter 1

Java lineage

  ü Java is related to c++.

  ü Java is directly inherited from c and c++.

  ü Most of the characters, characteristics were inherited from both c and c++.

  ü Java derives its syntax from c.

  ü Most of the oops features in java is derived from c++.

Creation of java

v  In 1991 James Gosling and his team to contribute hard work for developing the Java.

v  Java programming language was designed at Sun Micro systems.

v  The initial version of java nearly took 18 months for its implementation.

v  The initial version of java is called as Oak.

v  In 1995 Oak was renamed to java.

v  After 1995 java was recognized by the computer users.

v  Most of the java features were derived from c and c++. 

How java changed internet

      Most of the internet applications like web-browsers are developed with the help of java script language.

Ø Java script follows java features.

Ø In a network two categories of objects are transmitted in between server and our personal computers (clients), which provide static and dynamic information.

Ex:  If we want to check our mail id’s (or) any other social networks, initially we have to login.

Ø Java programs are very important for internet due to the following reasons

a.  Security

b.  Portable

             a)   Security:

      Java programs will provide more secure than others.

ü Suppose every time that we want to download a normal app from the browsers from any point they will get viral infection (virus).

ü Java will provide firewall features for detecting the virus.

ü As firewall is software.

ü By providing the firewalls we can maintain security for the following areas.

                                                       i.   Credit card details

                                                     ii.   Bank account balance.

                                                  iii.   Passwords

                                                  iv.   By searching the contents of our computer local files etc.,

ü We ever we use a java compactable web-browsers, you can safely download without fear of viral –infections.

               b)   Portability:

     It is another important feature from java programming language.

ü Portable means or transfer.

ü Now a day’s most of the people that they are using computers with several operating systems; computers are connected to internet for various reasons.

ü Once we can write java program, that program can run in computers, operating systems with or without small modifications. This feature is refers to portable.

Ø Java applet programs are used for internet purpose.

Applet

An applet is a special kind of java program i.e., is designed to transmit over the internet network and automatically executed by the java compactable web-browsers.

 Ex:  Images, sound files, video files.

                                                                                            Or

An applet is a special kind of java program that will react to user input and dynamically change.

Byte code

  v Most of the Java programs provide both security and portability.

  v The output of Java compiler is not executable code rather than it is Byte code.

  v Byte code is highly optimized set of instructions that are designed to be executed by    Java Virtual Machines (or) Java Runtime Machines (JVM).

  v JVM is an interpreter for Byte code.

  v Java programs are interpreted by the JVM that helps to solve the major problems           associated with downloaded programs over the internet.

  v Translating Java programs into Byte code makes it easy to run a program in several       environments.

  v When a program is compiled to an intermediate form and then interpreted  by JVM,     it runs slower than the compiled to executable code because Byte code has been             highly optimized, the use of Byte code enables the JVM to execute programs much       faster than the others.

  v Java programs are executed by JVM, such programs will provide more secure.

  v Sun Micro systems Hotspot technology for compilation process, Hotspot technology     will provides JIT (Just In Time) compilers for Byte code.

  v JIT stands for Just In Time.

  v JIT compiler is a part of JVM, which is used to compile the select portion of Byte        code into executable code.

Java Buzz Words

    Java contains several functions or Buzz words such as

1.  Simple

2.  Secure

3.  Portable

4.  Object Oriented

5.  Robust

6.  Multithread

7.  Distributed

8.  Interpreted and High performance

9.  Dynamic

   1)   Simple:

      ü It is a first feature from Java.

       ü Java was designed to be easy for programmers to learn and use effectively.

       ü By using the C syntaxes and C++ structures Java was designed.

        ü If we know about oops features, simply we can write a Java program.

      2)   Secure:

          ü Java programs will provide more secure than the others.

           ü ­­Suppose every time we want to download a normal app from the                            browsers at any point the device will get viral infection (virus).

           ü Java will provide “Firewall” feature for detecting the virus.

           ü Firewall provides the communication in between network application and over computer.

           ü Firewall is software.

           ü By providing the Firewall we can maintain security for the following                   areas;

                       a.  Credit card details

                       b. Bank Account Balance

                       c.  Passwords

                       d. By searching the contents of our computer local file systems etc.,

 ü  Whenever we use a Java compatible web Browsers, we can safely download without fear of viral infections.

   3)   Portability:

             ü It is another important feature from Java programming language.

            ü Portable means move or transfer.

            ü Now a days, most of the people are using computers with several           operating systems, computers are connected to internet for various reasons.

            ü Once we write a Java program, that program can run in any computers,            operating systems with (or) without small modifications. This feature is                          refers to portable.

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