Welcome to the Ranch, harsh sahay.
When you create an inner class MyInner inside MyOuter, the
Java compiler will indeed generate a class file named MyOuter$MyInner.class for the inner class. By the way, how did you get the output in the bottom half of your code - did you run
javap or a similar tool?
I guess the compiler is smart enough to see that the constructor of your class MyInner contains no code and therefore you don't see it when you decompile the class. Try adding some code in there (for example just a simple
System.out.println("hello");) and then you'll see the constructor when you decompile it.
About paramMyOuter: Each instance of a non-static inner class has a reference to the instance of the outer class that it was created in. The paramMyOuter is how the compiler passes this internally to the inner class. When you make class MyInner static, I think this will disappear.
(I've closed the copy in the other forum, let's answer the question in this forum).