Java introduction with jvm architecture

1. JAVA
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2. ▪ Java is a general-purpose, concurrent, class-based,
object-oriented computer programming language that is
specifically designed to have as few implementation
dependencies as possible. It is intended to let application
developers "write once run anywhere" (WORA) meaning
that code that runs on one platform does not need to be
recompiled to run on another.
▪ Platform ?!
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OS PROCESSOR+ PLATFORM
Ex: Windows + Intel called Wintel
JAVA?

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1
c
c
c
JAVA C COMPILER
2
BYTE CODE
0101001
01100100
3
Loader
Byte
Code
verifier
Execution
JIT
JVM
4
.Class file.Java file
Final Output
Source code
JVM Architecture

4. Advantage
▪ The Java language has both compiled and interpreted. Instead of
translating Java programs into machine language, the Java compiler
generates Java byte code.
▪ Java is easy to learn.
▪ Java is object-oriented.
▪ Java is platform-independent.
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5. Features
▪ Simple
▪ Secure
▪ Portable
▪ Object-oriented
▪ Robust
▪ Multithreaded
▪ Architecture-neutral
▪ Interpreted
▪ High performance
▪ Distributed
▪ Dynamic
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6. JDK,JRE
▪ JRE = JVM+lib
▪ JDK=JRE + Development tools
▪ Therefore JDK={JVM+lib}+Development tools
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