Just fancy asking some questions which i have never really thought about

I just fancied asking some basic questions which i have never really thought about, but suppose i should know.
The first one is:
A java program is executed through the main method
public static void main(String[] args)So this method is passed a String array but i never pass the array to it, so who does?
And secondly, you can have variables of type int and variables of type Integer. What is the difference?
thanks

I'll take a stab with some overly-simplistic answers. Corrections most welcome.
A java program is executed through the main method
public static void main(String[] args)So this method is passed a String array but i never pass the array to it, so who does?The OS passes the parameters to the JVM and the JVM calls the main method with the parameters from the OS.
And secondly, you can have variables of type int and variables of type Integer. What is the difference?Integer is a wrapper class for the primitive int type. It allows you to use int-type concepts in places where an Object is required. But don't over-use these as there is a memory and performance overhead that must be taken into consideration.

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Just fancy asking some questions which i have never really thought about

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