Introduction To Java
What is Java?
Ans: Java is
a high-level programming language originally developed by Sun microsystem but
currently owned by Oracle.
Why we should learn java / Features of Java?
Ans:
1. Platform
independent (WORA= Write Once Run Anywhere)
2. Object
Oriented
3. Support
web-based application
4. Robust
(Strong Language)
5. Secure
6. multi-threaded
What does platform independent means?
Why C/C++ is not platform independent?
Ans: Because if
you write any code or program using the Windows Operating System with the help of
C/C++ then it will run only on the windows operating system. It will not run-on Linux
Operating System.
And
if you write the same program on Linux operating system then it will run only
on Linux and not in windows. That’s why C/C++ is not platform-independent.
Why JAVA is platform independent?
Ans: But java
is an exception in this case because here you have a layer between java and
windows operating system which is called JVM (Java
Virtual Machine). Now, whenever you make a java
program in this place if you want to run it then you will take the help of JVM to
run it. So, whenever you want to run this program in Linux operating system.
It will run because you are taking the help of the JVM here.
Whenever
we make a java program it has an extension (.java). And when we compile that java program, then
the compiler will convert it into a byte code.
And
when this byte code is executed (JVM), It can be executed in windows. We can run
the same program on Linux with the help of JVM.
And
we can run that program in mac os with the help of JVM. That’s why java is
called platform independent.
History Of Java.
Why was java actually created?
Ans: When
C/C++ were all these programming languages, there was a big problem od C/C++. The
problem is that C++ was not user-friendly and not platform-independent which is
the main problem.
That’s
why if you create a program on the windows operating system, you cannot run it on Linux
or Mac OS. For which Sun Micro System took up a project called green project.
Their
aim was to create a platform of independent language. In 1990 there were many people
join in this plan, and one of them who contributed the most his name is James Gosling. For that reason, he
is also called the father of java.
First
of all, its name was OCK programming language. Then its name was changed to java programming
language. And
java was publicly released in 1995.
Required Software:
1. JDK
(Java Development Kit)
The
java development kit (JDK) is a software development environment used for
developing java applications and applets. It includes the java Runtime Environment
(JRE), an interpreter/loader (java), a compiler (javac), an archiver (jar), a
documentation generation (Javadoc), and other tools needed in java development.
2. IDE (Netbeans/Eclipse/JDeveloper)
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