Transcript
WELCOME
JVM
MIDHUN SUDHAKARmidhusudhakaran@gmail.comMidhun.sudhakar.73@facebook.com twitter.com/midhunopusin.linkedin.com/pub/midhunsudhakar/86/a65/
a9b/Phonenumber
9995586182
Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
CONTENTWHAT IS VIRTUALIZATIONWHAT IS JVMHOW IT WORKSCOMPARISON ON JVM,JRE,JDKDIFFERENCE BETWEEN JVM AND JIT
WHAT IS JVM
A Java virtual machine is a virtual machine that can execute Java byte code.
HOW IT WORKS
Lets first look atCompile and linking process in c
a1.c
a2.c
a3.c
main(){
F1();F2();
}
F1(){}
F2(){}
a1.c
a2.c
a3.c
main(){
F1();F2();
}
F1(){}
F2(){}
main(){
F1();F2();
}
F1(){}
F2(){}
COMPILER
main(){
F1();F2();
}
F1(){}
F2(){}
COMPILER
a1.obj
a2.obj
a2.obj
Object files contain machine code
main(){
F1();F2();
}
F1(){}
F2(){}
COMPILER
a1.obj
a2.obj
a2.obj
LINKER aa1.exe
a1.exe
RAM
a1.exe
RAM
Lets look at theCompile and linking process in JAVA
a1.java
a2.java
a3.java
main(){
F1();F2();
}
F1(){}
F2(){}
main(){
F1();F2();
}
F1(){}
F2(){}
COMPILER
Main(){
F1();F2();
}
F1(){}
F2(){}
COMPILER
a1.class
a2.class
a2.class
.class files contain byte code
main(){
F1();F2();
}
F1(){}
F2(){}
COMPILER
a1.class
a2.class
a2.class
Unlike C no linking is done
a1.class
a2.class
a3.class
RAM
JVM
JAVA ARCHITECTURE
a1.class
RAM
JVM
JAVA ARCHITECTURE
a2.class
a3.class
CLASS LOADER
RAM
JVM
JAVA ARCHITECTURE
CLASS LOADER
a1.class
a2.class
a3.class
a1.class
RAM
JVM
JAVA ARCHITECTURE
a2.class
a3.class
CLASS LOADER
BYTECODE VERIFIER
a1.class
RAM
JVM
JIT converts BYTE CODE into machine code
a2.class
a3.class
CLASS LOADER
BYTECODE VERIFIER
EXECUTIONENGINE
JIT CODE GENERATOR
COMPARISON ON JVM,JRE,JDK
JVMJVMJVM
JREJDK
JRE
DIFFERENCE BETWEEN JVM,JIT
IS JAVA A COMPILED OR AN INTERPRETED?
JAVA is both compiled and interpreted
THANK YOU
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