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if we create a main method in a static nested class then run a program by the command Outerclass$Innerclass why?

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The static variable can be used to refer the common property of all objects (that is not unique for each object) e.g. company name of employees,college name of students etc. The static variable gets memory only once in class area at the time of class loading.
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What is interesting here is that when we compile a file that contains an inner class, we actually end up with two class files and not one. Because of the fact that the inner class is technically a separate class, a separate class file will be created for it as well -- which can see with the “OuterClass$InnerClass.class”...
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What is interesting here is that when we compile a file that contains an inner class, we actually end up with two class files and not one. Because of the fact that the inner class is technically a separate class, a separate class file will be created for it as well – which can see with the “OuterClass$InnerClass.class” class file. The dollar sign is used to separate the inner class name from the outer class name. But, we will not be allowed to run the command above, because an inner class can not have any static members at all – and that includes “public static void main()”. This is because we would not be able to access the instance variables of the outer class from within a static context of the inner class. And, if there were a static method inside the “inner class” it wouldn’t even be an inner class – it would technically have to be declared with the static modifier and therefore it would be a static nested class. So, this means that the only way that we can access an inner class is by creating an actual instance of the outer class. And this also means that we can only access the inner class at runtime when we already have an instance of the outer class that we can use to access the inner class. read less
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After compilation the CLASSfile for inner class iis Outerclass$Innerclass
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