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1. We Believe in The Power of Single Idea

2. • Java is a programming language and a platform.
• Java is a high level, robust, secured and object-
oriented programming language.
What is Java

3. • Platform: Any hardware or software environment in
which a program runs, is known as a platform. Since
Java has its own runtime environment (JRE) and API,
it is called platform.
What is Platform

4. • Java was developed by James Ghosling, Patrick
Naughton, Mike Sheridan at Sun Microsystems Inc. in
1991
• Originally designed for small, embedded
systems in electronic appliances like set-top
boxes.
• Firstly, it was called "Greentalk" by James
Gosling and file extension was .gt.
Creation of Java

5. • After that, it was called Oak and was developed
as a part of the Green project.
• Why "Oak" name
• Oak is a symbol of strength and choosen as a
national tree of many countries like U.S.A.,
France, Germany, Romania etc.
• In 1995, Oak was renamed as "Java" because it
was already a trademark by Oak Technologies.
Creation of Java

6. Java is an island of Indonesia where first coffee
was produced (called java coffee).
Creation of Java

7. • java development kit contains tools needed to
develop the Java programs.
JAVA DEVELOPMENT KIT

8. • The Java Developer’s Kit contains a variety of tools and
Java development information
• Interpreter
• Compiler
• Applet Viewer
• Debugger
• Class File Disassembler
• Header and Stub File Generator
• Documentation Generator
JAVA DEVELOPMENT KIT

9. • PATH OF JDK
• C:Program FilesJavajdk1.8.0_141bin
JAVA DEVELOPER KIT

10. • The Java Runtime Environment (JRE), also known as
Java Runtime, is part of the Java Development Kit (JDK)
• it consists of the Java Virtual Machine (JVM), core
classes, and supporting files.
JRE

11. JRE

13. Byte Code

14. JVM (Java Virtual Machine) is an abstract machine. It
provides runtime environment in which java byte code can
be executed. The JVM performs following operation:
• Load code
• Verify Code
• Execute code
• Provide runtime environment
JVM

16. Internal Detail Of JVM

17. Classloader:
• Class loader is a subsystem of JVM that is used
to load files.

18. Class Loader
• Bootstrap Class Loader – JRE/lib/rt.jar
• Extension Class Loader – JRE/lib/ext
• Application ClassLoader – CLASSPATH
environment variable, -classpath or -cp
option, Class-Path attribute of Manifest inside
JAR file.

19. Class(Method) Area
• Class(Method) Area stores per-class structures
such as the runtime constant pool, field and
method data, the code for methods.

20. Heap
• It is the runtime data area in which objects are
allocated.

21. Stack
• Java Stack stores frames. It holds local variables and
partial results, Each thread has a private JVM stack

22. Program Counter Register
• PC (program counter) register. It contains the
address of the Java virtual machine instruction
currently being executed.

23. Native Method Stack
• It contains all the native methods used in the
application.

24. Execution Engine
• 1.A virtual processor
• 2.Interpreter
• 3) Just-In-Time(JIT) compile

26. Example
• Cloth Manufacturing Process
Cotton assume its source code

27. cotton to yarn(Source Code To Byte Code)
Source Code Byte Code

28. Yarn To Cloth
yarn send to particular environment (cloth factory) where
its Convert Into cloth

29. • Cotton Source Code
• Yarn  Byte Code
• Cloth Factory  JVM
• Labour,Electricity Is JRE

31. Thank you!
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