Java is a programming language. It was first developed by James Gosling at Sun Microsystems, which is now a part of Oracle Corporation. It was released in 1995 as a part of Sun Microsystems' Java platform. The language has developed much of its syntax from C and C++.

1. By
javawithease

2.  Java was originally designed by Sun
Microsystems Inc.
 Work Started on 1991
 First Version was released on 1995 named
Java 1.0
 James Gosling is known as father of Java, he
was the Vice President of Sun Microsystem till 2010
 Recently Sun Microsystems is taken over by
Oracle Incorporation

3. Java
J2SE J2EE
Java
Card
J2ME

7. certifications for Java technologies:
* Java Platform, Standard Edition (Java SE)
o Sun Certified Java Associate
o Sun Certified Java Programmer
o Sun Certified Java Developer
* Java Platform, Enterprise Edition (Java EE)
o Sun Certified Web Component Developer
o Sun Certified Business Component Developer
o Sun Certified Developer for Java Web Services
o Sun Certified Enterprise Architect
* Java Platform, Micro Edition (Java ME)
o Sun Certified Mobile Application Developer

10.  Java is a Programming Language
 Java is a Development Environment
 Java is an Application Environment
 Java is a Deployment Environment

11.  Simple to program
 Platform Independent
 Portable
 Robust and Secure
 Speedup the Development
 Based on OOPs
 Multithreaded

12. There are four tools that make Java as Java
 JVM (Java Virtual Machine)
 JRE (Java Runtime Environment)
 Garbage Collection
 JVM tools interface

13. JVM is an imaginary machine which works like an
emulator at the runtime. All the JVM code stores in
.class file which is generated after compilation. The
codes inside .class file is known as Bytecodes and
these Bytecodes is the language of JVM
a.java compiler
a.class
Windows
UNIX/LINUX
Mac
JVM

14. JRE Contains:
 Class Loader
 Bytecodes Verifier
 Interpreter/JIT Compiler
 Runtime
 Hardware

15. a.java
a.class
comp
iler
Load
from
Hard
disk,
network
module
Class
loader
Bytecodes
verifier
Hardware
Interpreter
Runtime

16. In c, C++ we were responsible for
the de-allocation of memory.
This was a difficult exercise at
times , because we do not
always know in advance
when memory should be released.
The Java Programming language removes your from
the responsibility of de-allocating memory. It provide a
system level thread that tracks each memory
allocation.
Advantage: Save data from Memory Leaks

17. public class HelloWorld
{
private String message=“Welcome in Java Programming”;
public String sayHello()
{
System.out.println(message);
return message;
}
public static void main(String[] args)
{
HelloWorld hello=new HelloWorld();
hello.sayHello();
}
}
Output:
Welcome in Java Programming