Concept of function:
A function is an independent block of code defined in a class to implement a certain function. In Java, functions are also called methods. The main purpose of functions is to improve code reusability. Functions are all run in stack memory, and the running function is on the top of the stack.
Function format:
修饰符 返回值类型 函数 名 （ [ 参数类型1 参数名1,参数类型2 参数名2.... ] ）{ // [ ] 里面表示可选项，即参数不是必须的 执行语句... return 返回值； //返回值的类型必须与返回值类型一致 }
Description:
Modifier: It can be an access modifier or It is said to be function modifiers (abstract, final, static, synchronized), or a combination of the two.
Return value type: The data type used to limit the function return value.
Parameter type: used to limit the data type passed when calling the function.
Parameter name: It is a variable used to receive the data passed when calling the method.
return: Used to receive methods and return values of the specified type from the function.
Return value: This value will be returned to the caller of the function.
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