TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 102

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 102', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Objective-C objects have these attributes Class An object type. An object whose type is MyClass is said to be an instance of MyClass. Fields Data members of an object. An object has its own copies of the fields declared by its class or its ancestor classes. Fields are also referred to as instance variables. I prefer the term fields for several reasons instance variables is redundant since there are no class variables it is ambiguous since it could mean variables that are instances just variables would be more ambiguous and fields is shorter. An alternative term is ivars. Methods Functions provided by an object. An object responds to methods declared by its class or ancestor classes. A few special objects class objects acquire their fields and methods differently. Section describes class objects. Objective-C objects are implemented so that They exist in dynamically allocated memory. They can t be declared on the stack or passed by value to other scopes. They are referred to only by pointers. When someone says of an Objective-C variable c is an instance of C you should understand that to mean that c is a pointer to an object of type C. Classes Classes are types in Objective-C. The interface of a class specifies the structure of its instances the implementation provides its code. The interface and implementation of a class are separate usually in different files. Categories add to an existing class without subclassing it they also have separate interface and implementation. Protocols are pure interface declarations. Classes declare the following attributes Parent class The class whose methods and fields will be inherited by the new class being declared. Class name The name of the class being declared. Fields Data members of each instance of the class. Instance methods Functions associated with instances of the class. Class methods Functions associated with the class itself. Because Objective-C makes calling class methods syntactically identical to calling .

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