design patterns elements of reusable object oriented software book pdf

Object-oriented design is mainly about the concept of design, software architecture, system design, detailed design, application design mode, user interface

For the design of object-oriented software systems, improving system reusability while supporting maintainability is a crucial issue, how to Improve the maintainability and reusability of a software system at the same time is one of the core issues that need to be addressed in object-

adapts to the law of human cognition process and is the symbol of object-oriented design. Interface Isolation principle (Interface-segregation Principle). "Multiple dedicated interfaces are better than a single common interface. "This principle is the natural result of a single duty principle for interface design. An

Javascript OOP design Pattern Object-oriented programming When we first wrote the JS code, it was written like this. function CheckName () { //verify name } function Checkemail () { //verify mailbox } function Checkpassword () { //Verify password } This way can cause serious pollution of global variables, and then transiti

in Iofile.However, virtual inheritance is not commonly used because: 1. Virtual inheritance increases the cost of space and time. 2. Virtual inheritance can be very complex (writing costs) because the virtual base class, either indirectly or directly inherited, must assume the initialization of these bases, regardless of how many layers of inheritance are. Please rememberMultiple inheritance is more complex than single inheritance. It can lead to new ambiguity and the need for

reasons such as the need to modify the original code of the software, may introduce errors in the old code, or we will have to refactor the entire functionality, and the original code needs to be tested again. This has a special impact on our entire system, which also fully shows the coupling of the system if too high, will greatly increase the later expansion, maintenance. In order to solve this problem, people have summed up the principle of opening and closing. The fundamental solution to th

The opening and closing principle is the first cornerstone of object-oriented reusable design, and it is the most important object-oriented design principle. The opening and closing pri

); parent.goSchool(); parent.pay(); parent.getBook(); parent.goHome(); }}? Usually the beginning of the school report is very happy, because after all, just finished years, received a lot of lucky money, but also waiting to go to school flowers quickly. But Xiao Ming too much love, too little money, rather die than report, to Xiao Ming himself to the school report too difficult, Xiao Ming's parents had to replace Xiao Ming to register. Instead of Xiao Ming to enrol

coupling degree, reducing The effect of class changes on other classes.The principle of synthetic multiplexing is to use some existing objects in a new object to make them part of the new object through association relationships (including combinatorial relationships and aggregation relationships), and the new object to invoke the method of the existing

The so-called design principles or design patterns are nothing more than those created on the premise of object-oriented. The premise of object-oriented is abstraction. The three featur

First, we need to know what the mode is: In short: while people constantly discover problems and find solutions to problems in their own environments, discovering different problems actually involves a common nature. These essence is what we call models. Therefore, the model is representative. In the Object-Oriented field, the earliest modeling method research was published in 1995 by Gang of Four (gof, Eri

break the packaging of the program, the client sees the method should not be seen, no custom interface for the client. Therefore, the interface needs to be reconstructed according to the principle of interface isolation and the principle of single responsibility, and some of these methods are encapsulated in different small interfaces, ensuring that each interface is convenient to use and assumes a single role, each of which contains only one client (such as a module or class) that is required

I entered school in September and graduated in July. It ended my pleasant and rich college life at the Software Institute. This series is a review of the four-year study of professional courses, see: http://blog.csdn.net/xiaowei_cqu/article/details/7747205 Object-Oriented Programming This is the first lesson in programming. I was also the first time in this course to get started with programming languages a

Object-oriented analysis is a process of acquiring and understanding user's needs, analyzing the problem domain, confirming and establishing the conceptual model of problem area. and object-oriented design (OOD) is from the perspective of computer technology, the analysis of

Seven design principles of object-oriented1. Opening and closing principle2, the Richter replacement principle3. Single Duty principle4. Interface Isolation principle5. Dependency Inversion principle6. Dimitri Principle7. Combination/The principle of aggregation multiplexingKnowledge Point CorrelationLearning object-oriented