Java as Object Oriented Programming Language

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HOPE FOUNDATION’S
INTERNATIONAL INSTITUTE OF INFORMATION TECHNOLOGY, (I²IT)
www.isquareit.edu.in
+91 20 22933441 / 2

Hope Foundation’s International Institute of Information Technology, I²IT, P-14 Rajiv Gandhi Infotech Park, Hinjawadi, Pune - 411 057
Tel - +91 20 22933441 / 2 / 3 | Website - www.isquareit.edu.in ; Email - info@isquareit.edu.in
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Java as Object Oriented
Programming Language-
Overview
- Ms. Shilpa Jadhao

History of JAVA Language…
• Java language developed by company Sun
Microsystems and the creator is James
Gosling.(sun->Stanford university network)
• Group of 4 students at Stanford university
• Problem : create one remote control which
can access all electronics appliances.
• Contacted James, given name Green,
launched in 1992.
• Vinod Ghosala was one of them 4 (Indian)
• Based on concept of remote, decided to have
platform independent language.. Developed
language OAK then renamed it as JAVA.

• Oak is a symbol of strength and chosen 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.
• The suggested names for the languages were "dynamic", "revolutionary", "Silk",
"jolt", "DNA" “JAVA”etc.
• Java is an island of Indonesia where first coffee was produced (called java
coffee).
• In 1995, Time magazine called Java one of the Ten Best Products of 1995.
• JDK 1.0 released in(January 23, 1996).
• SUN microsystems is now (2010)acquired by Oracle.
• Punch line of JAVA : JAVA is everywhere!
"Write once, run anywhere" (WORA)
"write once, run everywhere" (WORE)
History of JAVA Language

Versions of Java
1. Java SE ( core java) standard edition
2. Java EE (enterprise edition ) advanced
3. Java ME(micro edition for mobiles ) but now android
is used , java used in android.
• And many more.
• Base is java SE
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Introduction to JDK JRE JVM
• Do your computer understands high level language?
• Compiler and Interpreter
• The Compiler of java called as javac converts source code into a
Intermediate file known as Bytecode file.
• The Bytecode file is unique for all types of OS.
• The Interpreter of java (java) converts Bytecode into the
specific OS compatible machine code . This code will vary
according to OS.
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Write source code
Compilation done by
JavaC (compiler)
JDK (java development kit)
I/p
O/p
Bytecode
I/p
JVM (Java
Virtual Machine)
= interpreter
Final
O/p
Figure 1: Program execution flow in Java

•Java Runtime Environment(JRE) :- is part of the
Java Development Kit (JDK). It contains a set of
libraries and tools for developing Java application.
•Java Virtual Machine (JVM)
JVM is set of programs developed by sun Micro System
and supplied as a part of the JDK for reading line by
line line of byte code and it converts into a native
understanding form of operating system.
JRE and JVM

Figure 2: Java Runtime Environment (JRE)[1]
Figure 3: Java Development Kit (JDK)[1]

Linking in C
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Figure 4: Linking in C programming

Linking in Java
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Figure 5: Linking in Java programming

Hello I am JVM !
I Provide runtime environment
to execute bytecode.
Hello I am JDK !
I am physically exists and contains
Java tools, JVM, JRE
Hello I am JRE !
I am the collection of set libraries and
different tools

Features of JAVA
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Figure 6: Features of Java [1]

JVM Architecture…
• Heap: Heap is a part of JVM memory
where objects are allocated. JVM
creates a Class object for each .class
file.
• Stack: it is used for storing temporary
variables.
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• The class loader reads the .class file
and save the byte code in
the method area.
• Method Area: There is only one
method area in a JVM which is
shared among all the classes. This
holds the class level information of
each .class file.
Figure 7: JVM Architecture [2]

PC Registers: This keeps the track of which instruction has been executed
and which one is going to be executed. Since instructions are executed by
threads, each thread has a separate PC register.
Native Method stack: A native method can access the runtime data
areas of the virtual machine.
Native Method interface: It enables java code to call or be called by native
applications. Native applications are programs that are specific to the
hardware and OS of a system.
Garbage collection: A class instance is explicitly created by the java code
and after use it is automatically destroyed by garbage collection for memory
management.
JVM Architecture

[1] https://www.javatpoint.com
[2] https://www.santhoshreddymandadi.com
References

THANK YOU
For further information please contact
Prof. Shilpa Jadhao
Department of Computer Engineering
Hope Foundation’s International Institute of Information Technology, I²IT
Hinjawadi, Pune – 411 057
Phone - +91 20 22933441
www.isquareit.edu.in | shilpaj@isquareit.edu.in
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Java as Object Oriented Programming Language

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