TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 103

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 103', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Lines 7 8. Define methods with the same signature syntax as in the header follow each method definition with the code in braces. For more information on writing the code see Section . Line 9. No semicolon after the @end keyword. Inheritance and Subtyping Inheritance and subtyping are the fundamental object-oriented features inheritance lets you declare how one type differs from another and subtyping lets you substitute one kind of object for another when their types are compatible. A class s interface may declare that it is based on another class @interface MyClass Parent This is described by saying MyClass is a subclass of Parent and has the following runtime effects MyClass responds to any class method that Parent responds to. Instances of MyClass have all the fields that instances of Parent have. Instances of MyClass respond to any instance methods that instances of Parent respond to. These effects are summarized by saying MyClass inherits Parent s fields and methods. These properties imply that inheritance is transitive any subclass of MyClass also inherits from Parent. Declaring a class and specifying a parent also has these effects at compile time You can refer to inherited methods and fields. You can assign variables declared as MyClass to variables declared as Parent. This is described by saying MyClass is a subtype of Parent. Subtyping is also transitive. For example any subclass of MyClass is a subtype of Parent. You can t redeclare fields in a subclass either identically or with a different type. Unlike C this holds even if the inherited field was declared private. A subclass can replace or override an inherited method with a different version. You do this by providing a new implementation for the method when you write the subclass. At runtime instances of the subclass will execute the new code in the overriding method instead of the code of the inherited method. By definition the overriding method has the same name as the inherited one it .

• Kỹ thuật lập trình
• Thủ thuật lập trình
• hướng dẫn lập trình
• tài liệu lập trình
• học lập trình
• Java C Scrip SQL
• kỹ thuật lập trình
• kỹ năng lập trình
• bí quyết lập trình
• phương pháp lập trình
• tư liệu lập trình
• kĩ thuật lập trình
• kĩ năng lập trình
• AutoIT