How to add things permenantly to the class path?

Greetings
guys, I 'm using morena package(doesnot matter what it is), and when i need to execute my application i have to use things like this:
java -cp examples\examples.jar;javatwain.jar -Xmx128M -Xbootclasspath/p:javatwain_license.jar RunExample
please, is there any simple tutorial to understand this line and what it does exactly, and how can I run my application simply by using (java runexample). I know that things needed to be added to the classpath, and others to variables path; but how, what, and why etc...
simply i cannot understand this all.

the PATH is used by the operating system to determine where to look for files when no directory is give.
It has nothing at all to do with Java, it just tells the operating system where it can find your java and javac (and others) when you type "java MyClass" (for example) on the command prompt.
Anything not on the path can still be used by the operating system as long as you tell it exactly where to look.
the CLASSPATH is used internally by Java to determine where it can find classes.
It can contain directories and jar-files (PATH can contain only directories). The operating system does nothing with it (except telling java what it is when asked).
Any class that can't be found on the classpath doesn't exist as far as java is concerned.
So they perform similar roles but in a quite different context.

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How to add things permenantly to the class path?

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