No, not directly; however, it is possible for a method to contain a local inner class, and of course that inner class can contain methods. This StackOverflow question gives some examples of that. In your case, however, you probably just want to call countdown from inside main; you don't actually need its entire definition to be inside main.
What is the difference between method name and method body?
methodName - It is an identifier that is used to refer to the particular method in a program. method body - It includes the programming statements that are used to perform some tasks. The method body is enclosed inside the curly braces { }. In the above example, the name of the method is adddNumbers (). And, the return type is int.
Why does a method have a unique name?
Typically, a method has a unique name within its class. However, a method might have the same name as other methods due to method overloading. The Java programming language supports overloading methods, and Java can distinguish between methods with different method signatures.
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Method types and properties are orthogonal and can be composed (almost) The exact definition of these method types can be found at riehle java report or even private methods, because they are used only from inside the class
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