Chapeter 4 Classes and Interfaces Item 20: Prefer class hierarchies to tagged classes tagged classes are verbose, error-prone, and inefficient. Occasionally you may run across a class whose instances come in two or more flavors and contain a tag field...
Chapter 3 System Programming Concepts 3.1 System Calls [Concept] A system call is a controlled entry point into the kernel, allowing a process to request that the kernel perform some action on the process’s behalf. [How] How a system call...
Chapeter 4 Classes and Interfaces Item 19: Use interfaces only to define types When a class implements an interface, the interface serves as a type that can be used to refer to instances of the class. 1.constant interface: fails this...
Chapeter 4 Classes and Interfaces Item 18: Prefer interfaces to abstract classes 1.Existing classes can be easily retrofitted to implement a new interface. 2.Interfaces are ideal for defining mixins. 3.Interfaces allow the construction of nonhierarchical type frameworks. 4.Interfaces enable safe,...
Chapeter 4 Classes and Interfaces Item 17: Design and document for inheritance or else prohibit it 1.the class must document its self-use of overridable methods. 2.a class may have to provide hooks into its internal workings in the form of...