Advanced java training in bangalore
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The document outlines the workings of the Java Virtual Machine (JVM), detailing the components involved in writing, compiling, and executing Java programs. It explains the process of class loading, memory management, and execution flow, emphasizing the JVM's role in converting bytecode to machine code. Additionally, it discusses the architecture of the JVM, including its subsystems and functionalities such as code verification and garbage collection.
![[1] Once we write a program , we have to save with
the class name.java.
[2] Once we execute a program .java file converts
into .class file
[3] JVM convert the .class file into machine code.
[4] JVM divide the memory into stack and memory
memory.](https://image.slidesharecdn.com/advanced-java-training-in-bangalore-170428065836/85/Advanced-java-training-in-bangalore-6-320.jpg)
![[4] Then JVM call the class loader , class loader go
back to the main class and find the all stack
members and load into heap memory.
[5] Again control go back java course in bangalore
to the JVM , it loads the all static members
into stack.
[6] Then it try to identifies the main method and
start the execution.](https://image.slidesharecdn.com/advanced-java-training-in-bangalore-170428065836/85/Advanced-java-training-in-bangalore-7-320.jpg)
![[7] If main method is not there , then it will
through the error and execution will stop.
[8] Once execution done JVM call garbage
collector to clear the memory.](https://image.slidesharecdn.com/advanced-java-training-in-bangalore-170428065836/85/Advanced-java-training-in-bangalore-8-320.jpg)
![[1] Classloader:
Classloader www.aspendailynews.comis a
subsystem of JVM which is used to load the
class files into the memory.
Best core java training in bangalore
[2] Class Area(Method Area):
Class Area stores per-class structures such as
the runtime constant pool, fields and
methods, code for methods.](https://image.slidesharecdn.com/advanced-java-training-in-bangalore-170428065836/85/Advanced-java-training-in-bangalore-13-320.jpg)
![[3] Stack:
Java Stack stores frames.It holds local variables
and partial results, and plays a part in method
invocation and return.
[4] Native Method Stack:
Native Method Stack contains all the native
methods used in the application.
[5] Heap:
Heap is the runtime data area in which objects
are allocated and stored.](https://image.slidesharecdn.com/advanced-java-training-in-bangalore-170428065836/85/Advanced-java-training-in-bangalore-14-320.jpg)
![[6] Program Counter Register:
PC (program counter) register contains the address
of the Java virtual machine instruction currently
being executed.
[7] Execution Engine :
Execution Engine contains
i) A virtual processor
ii) Interpreter: Read bytecode stream then execute
the instructions.
iii) Just-In-Time(JIT) compiler: It is used to improve
the performance.](https://image.slidesharecdn.com/advanced-java-training-in-bangalore-170428065836/85/Advanced-java-training-in-bangalore-15-320.jpg)
Advanced java training in bangalore
- 1. Working of Java Virtual Machine (JVM ) in Java ...
- 2. To write and execute a program we need the following : 1) Editor – To type a program into, for example notepad, notepad++ etc. 2) Compiler – To convert high level language program into machine code Advanced Java Training in Bangalore
- 3. 3) Linker – To combine different program files reference in your main program together. 4) Loader – To load the files from the secondary storage device like Hard Disk, Flash Drive , CD into RAM for execution. The loading is automatically done when we execute our code. 5) Execution – Actual execution of the program which is handled by OS(Operating System) & processor.
- 5. Java Training Center Bangalore
- 6. [1] Once we write a program , we have to save with the class name.java. [2] Once we execute a program .java file converts into .class file [3] JVM convert the .class file into machine code. [4] JVM divide the memory into stack and memory memory.
- 7. [4] Then JVM call the class loader , class loader go back to the main class and find the all stack members and load into heap memory. [5] Again control go back java course in bangalore to the JVM , it loads the all static members into stack. [6] Then it try to identifies the main method and start the execution.
- 8. [7] If main method is not there , then it will through the error and execution will stop. [8] Once execution done JVM call garbage collector to clear the memory.
- 10. What is JVM ? JVM is known as Java Virtual Machine. It is the engine that executes the Java Code. It converts bytecode into machines code. Java/j2ee classes bangalore
- 11. 1) Java compiler produces code for a Virtual Machine. 2) JVM compiled java code into bytecode. This bytecode gets interpreted on machines 3) Between host system and Java Bytecode is an intermediate language. 4) JVM is responsible for allocating a memory space.
- 13. [1] Classloader: Classloader www.aspendailynews.comis a subsystem of JVM which is used to load the class files into the memory. Best core java training in bangalore [2] Class Area(Method Area): Class Area stores per-class structures such as the runtime constant pool, fields and methods, code for methods.
- 14. [3] Stack: Java Stack stores frames.It holds local variables and partial results, and plays a part in method invocation and return. [4] Native Method Stack: Native Method Stack contains all the native methods used in the application. [5] Heap: Heap is the runtime data area in which objects are allocated and stored.
- 15. [6] Program Counter Register: PC (program counter) register contains the address of the Java virtual machine instruction currently being executed. [7] Execution Engine : Execution Engine contains i) A virtual processor ii) Interpreter: Read bytecode stream then execute the instructions. iii) Just-In-Time(JIT) compiler: It is used to improve the performance.
- 16. Working of JVM:
- 17. The JVM performs following works : Advanced java training in bangalore 1) Loads the java code 2) Verifies the code 3) Executes the code 4) Provides runtime environment
- 18. Java is both compiled and interpreted language :
- 19. Compiler : A compiler is a program which converts a program from one level of language to another. Example conversion of C++ program into machine code. java/j2ee classes bangalore The java compiler convert high level java code into bytecode .
- 20. Interpreter : A interpreter is a program which converts a program at one level to another programming language at the same level. In Java , the JVM converts the bytecode into the native machine code
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