JVM plays an important role in execution of java program

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Presentation Transcript

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How JVM plays an important in the execution of Java program Presented By Infocampus

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To write a program we need- 1 Editor – To type a program into for example notepadnotepad++ etc. 2 Compiler – To convert high level language program into machine code 3 Linker – To combine different program files reference in your main program together. Infocampus software Training Institute

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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 OSOperating System processor.

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Java Code Compilation execution Best Core Java Training in Bangalore

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1 Once we write a program we have to save with the class name.java. 2Once we execute a program .java file converts into .class file 3JVM convert the .class file into machine code. 4JVM divide the memory into stack and memory memory. 5Then JVM call the class loader class loader go back to the main class and find the all stack members and load into heap memory.

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5Again control go back to the JVM it loads the all static members into stack. 6Then it try to identifies the main method and start the execution. 7If main method is not there then it will through the error and execution will stop. 8Once execution done JVM call garbage collector to clear the memory. Java Course in Bangalore

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What is JVM JVM stands for Java Virtual Machine. It is the engine that executes the java code. It converts byte code to machine code Infocampus Software Training institute

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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 source Bytecode is an intermediate language. 4 JVM is responsible for allocating a memory space.

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Working of JVM The JVM performs following works : 1Loads the java code 2Verifies the code 3Executes the code 4Provides runtime environment Java Training Center Bangalore

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Java is both Compiled Interpreted Language

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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. The java compiler converts high level java code into bytecode .

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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 Advance Java Training in Bangalore

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Architecture Of Java Virtual Machine

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1 Classloader: Classloader is a subsystem of JVM which is used to load the class files into the memory. 2 Class AreaMethod Area: Class Area stores per-class structures such as the runtime constant pool fields and methods code for methods. Java/j2ee classes bangalore

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3 Stack: Java Stack stores frames.It holds local variables and partial results and plays a part in method invocation and return. Each thread has a private JVM stack created at the same time as thread. 4 Native Method Stack: Native Method Stack contains all the native methods used in the application.

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5 Heap: Heap is the runtime data area in which objects are allocated and stored. 6 Program Counter Register: PC program counter register contains the address of the Java virtual machine instruction currently being executed. Infocampus software Training Institute

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7 Execution Engine : Execution Engine contains : i A virtual processor ii Interpreter: Read bytecode stream then execute the instructions. iii Just-In-TimeJIT compiler: It is used to improve the performance.JIT compiles parts of the byte code that have similar functionality at the same time and hence reduces the amount of time needed for compilation.

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Call 9738001024 Enquire at : http://www.infocampus.co.in/java-training- bangalore.html

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