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:
To set the temporary path of JDK, you need to follow following steps:
set path=C:\Program Files\Java\jdk1.8.0_171\bin
Let's see it in the figure given below:
For setting the permanent path of JDK, you need to follow these steps:
Go to MyComputer properties -> advanced tab -> environment variables -> new tab of user variable -> write path in variable name -> write path of bin folder in variable value -> ok -> ok -> ok
At compile time, java file is compiled by Java Compiler (It does not interact with OS) and converts the java code into bytecode.
At runtime, following steps are performed:
Classloader: is the subsystem of JVM 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.
Yes, if the class is not public. It is explained in the figure given below:
To Compile: Javac Hard.java
To Execute: Java Simple
Yes, like the figure given below illustrates: