Beginner - class & main method question

Question

Hello, I am still really new to OOP and Java. I came across an example in the book I am using that threw me for a loop.
ex.
class MyClass {
public static void main(String [] args) {
int x = 42;
MyClass y = new MyClass();
int z = y.go(x);
int go(int arg) {
arg = arg * 2;
return arg;
what I am confused about is the creation of a new class that contains the main method (MyClass y = new MyClass()), wouldn't this create a new class that also has a main method? Or is this the kind of code I will never encounter outside an example in a book and shouldn't worry about it :-)
Thanks

Answer 1

Since the main method is static, it would be invoked through MyClass.main(...). Note that this is not actually creating an object, just calling a static method.
Creating an object is an entirely different story. MyClass mc = new MyClass(); instantiates a new object of the class MyClass. You couldn't do mc.main(...) because main is static. You can call things such as mc's go() method because they are not static and thus belong to objects of that class, rather than the class itself.
...Or something. That all made sense in my head, but if it didn't make sense to you just tell me.