What does int.class mean

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A primitive becoming an Object

For primitives, there are Class objects available as constants named TYPE in the corresponding wrapper classes — i.e. int.class is changed to java.lang.Integer.TYPE . For other types, the compiler creates a private member variable in the class being compiled to hold the Class object, and generates code to initialize that member using Class.forName() .

Found some discussion

And a nice discussion here and your example also covered in this link.

A few words from there :

how can a Class be a primitive? Let’s confuse things a bit more. We can access the Class object representing a defined class by coding, say:

Equation.class // returns the Equation Class object

But, we can also say:

int.class

obtain a Class object whose name is “int”. Note we have not sent the getClass() method to an object; we have used the reserved word for a built-in primitive type (int) and, using dot notation, accessed its class “field.” And this returns a Class object!

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