javase 复习大纲（javase 复习大纲）.docVIP

javase 复习大纲（javase 复习大纲） Basic knowledge: Knowledge of variables, processes, controls, etc. that are familiar with the C language ============================================================== ============================================================== Object-oriented： 1. package Class: A concept derived from the abstraction of a class of things object A concrete thing Constructor There is no return value The method name is the same as the class name There can be multiple The default constructor that generates no arguments, no method body, no return value Once you have defined, the compiler will no longer generate the default constructor Generating a class object is one of the constructors that can and can only call one of them Static: Any member of the static modifier is a static member Static members belong to the class Non static can access static Static; non access; non static Only non private static members in a class can be accessed through the class name Private static members can not be accessed through object names This: The non static method defaults to a this pointer This represents the object that is calling the method Final: Decorated class This class cannot be inherited Modification method The method can be inherited, but not overridden Modify attributes Indicates that the property can and can only be assigned a value There are two ways, and you can only choose one of them Initialization of simultaneous display of 1. definitions 2. initializes in the constructor Modify local variables (rarely used) Function overloading The return value of the same name cannot be used as a basis for overloading the function 2. succession Definition Subclasses inherit members of the parent class Attention problems Non private members can inherit from the quilt class Rewrite： The 1. overwrite method must be the same as the overridden method The method name, parameter list, and return value 2. override methods cannot access less than overridden methods 3. polymorphism D