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Internal Details of Java

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we are going to learn, what happens while compiling and running the java program. Moreover, we will see some question based on the program.

What happens at compile time?

At compile time, java file is compiled by Java Compiler (It does not interact with OS) and converts the java code into bytecode.

compilation of simple java program 

What happens at Run time?

At runtime, following steps are performed:
what happens at runtime when simple java program runs
Classloader: is the subsystem of JVM(Java virtual m/c) that is used to load class files.
Bytecode Verifier: checks the code fragments for illegal code that can violate access right to objects.
Interpreter: read bytecode stream then execute the instructions.


The path is required to be set for using tools such as javac, java etc.

If you are saving the java source file inside the jdk/bin directory, path is not required to be set because all the tools will be available in the current directory.

But If you are having your java file outside the jdk/bin folder, it is necessary to set path of JDK.

There are 2 ways to set java path:

  1. 1.temporary
  2. 2.permanent
  3. 1) How to set Temporary Path of JDK in Windows

    To set the temporary path of JDK, you need to follow following steps:

    • Open command prompt
    • copy the path of jdk/bin directory
    • write in command prompt: set path=copied_path.
    • IN next post, will come up with permanent method.


By Manoj Pandey on   2 years ago
Nice article Ankita

How to set path

By Mayank Tripathi on   2 years ago
You can also set path in environmental variables:

Right click on MyComputer Icon
Select the Properties from the menu list
It will open System window 
Click on Advanced system settings
Click on Environment Variables, under System Variables, find PATH, and click on it.
In the Edit windows, modify PATH by adding the location of the class to the value for PATH. If you do not have the item PATH, you may select to add a new variable and add PATH as the name and the location of the class as the value.
Close the window.

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