parking lot design java

This week the teacher according to the traditional teaching method: the classroom teaching method to the fifth chapter succession carries on the key explanation, through the teacher's explanation, I learned a lot of knowledge, especially some details, this is oneself in the self-study process not to notice. This week, the teacher slowed down the progress, I feel that the effect of learning is much better than the previous weeks, may also be many years

The technology and tools involved: Java,springmvc,ibatis,freemarker,mysql,mongdb,memcached,ehcache,maven.A website can not be said to be the first to design a perfect structure to consider all situations, a mature architecture is the change in demand, traffic increases to change.Basic architecture:Web server: Ngnix+apache doing load balancingTechnical framework: Freemarker+springmvc+ibatis (Myibatis) +memca

PackageShipeiqidemo;/** A common design pattern in Java: Adapter * Source: A subclass to implement the interface, then you have to implement the interface of all the abstract methods, sometimes the abstract method * a lot, but do not need to implement all, so at this time define an abstract class to implement this interface, and then through the subclass to inher

, this time the most intuitive approach is:On the inside of the payment write n many if...else If...else, judge the user's scene, calculate the user payment amount according to the scene.This design clearly violates the opening and shutting principle. Opening and closing principle of "closed" refers to the modification is closed, but if there are several more algorithms, then you must modify the payment class again.In this way, you can use the policy

(The second layer of the decorator, equivalent to the decorator_first above)Package decorator; public class Chilli extends condiment { Humburger humburger; Public chilli (Humburger humburger) { This.humburger = Humburger; } @Override public String getName () { return humburger.getname () + "add Pepper"; } @Override public Double GetPrice () { return humburger.getpr

After reading this article on the Internet, the author uses a simple language to compare the 32 Java models, which is very helpful.Good stuff has to be transferredCreation Mode 1. Factory-try to catch up with mm. The chicken wings of McDonald's and the chicken wings of KFC are what mm loves. Although the taste is different, whether you take mm to McDonald's or KFC, just say "four chicken wings" to the waiter. McDonald's and KFC are factory for chicken

Createwasher () {return NewProductA2 (); } //Create a Class B product PublicProductB2 Createicebox () {return NewProductB2 (); } } PS Summary:1 Simple Factory mode: only one product interface (one product) a factory class that returns an instance of the corresponding product according to the given parameters2 Factory mode: Only one product interface (one product) multiple factory classes, each returning their own product instance benefits compared to the simple factory model: In

complex, there are many properties, and these properties are references to other objects, which may include a lot of object references. By encapsulating these complexities, you can use the build mode.Recommended Link: http://www.cnblogs.com/cbf4life/archive/2010/01/14/1647710.html4. Façade modeThis pattern feels like a replica of the service layer. For example DAO we define a lot of persistence methods, we

Based on asp, jsp, java, vb and other computer science Graduation Design Questions Daquan, jspvb I found a lot and found it was a part of it. Many of them were incomplete. Then I sorted them through the network. If I was interested, I could leave my mailbox to send them. I have not found a place where I can upload objects.Paste two images. One is 36 pages in the

(2) Implement functionality in a delegate class, referencing the same name method of the delegate class in the method of the proxy class(3) When an external class invokes a method of a delegate class, it directly points to an instance of the proxy class, which is the meaning of the proxy: masking.Proxy Mode Scenario Description:(1) When we want to hide a class, we can give it a proxy class(2) When a class needs different callers to provide different call permissions, you can use the proxy class

： Why are their properties private? What are the benefits of this design? Employeeadd an parameterless constructor for the class, call its parameter constructor, set name to 雇员1 salary, 3000 and hireday for the month and day 2017年3月5日 . (Paste code) EmployeeAdd an additional parameter constructor to the class, with only name and Salary,hideday as the current date. (Paste code) (1) Private only allows access within the class and c

same parent class).(2) The decorator holds a reference to a decorated person.(3) The adorner accepts all client requests, and these requests are eventually returned to the decorated person (see Wayne Chart).(4) Dynamically adding properties to an object at run time without changing the structure of the object. The greatest advantage of using the decorator pattern is that it is very well developed, and the flexibility is better than direct inheritance by using different decorative classes to mak

Single case Mode A single case pattern is used very frequently in programming, designed to provide only one object in a program (guaranteed to be constructed only once), such as log objects written to logs, and Windows Task Manager implementation (only one can be opened). Here we mainly introduce the implementation of Java for the single example mode (including a Hungry man and lazy). Implement Here, using the log class as an example, the log object

Builder Pattern is a design pattern that creates shapes, and uses multiple simple objects to build a complex object step-by-step.Main Solution: The main solution in the software system, sometimes facing the creation of "a complex object", which is usually made up of the sub-objects of the various parts with a certain algorithm, because of the change in demand, the various parts of this complex object often face drastic changes, But the algorithms that

(Singleton2.class) { if(Instance = =NULL) {instance=NewSingleton2 (); } } } returninstance; } }Output: PackageCom.sun.singleton; Public classMain { Public Static voidMain (string[] args) {//instantiate two times for comparison testing//a hungry man typeSingleton s1=singleton.getinstance (); Singleton S2=singleton.getinstance (); if(s1==12) {System.out.println ("A hungry man type is the same instance"); }Else{System.out.println ("A hungry man type is

The responsibility chain (Chain of responsibility) pattern is an object's behavior pattern. In the mode of responsibility chain, many objects are connected by each object's reference to their house to form a chain. The request is passed on this chain until an object on the chain decides to process the request. The client who issued the request does not know which object on the chain ultimately handles the request, which allows the system to dynamically rearrange and distribute responsibilities w

the Mediator object (mediator), the network structure of the system can be transformed into an intermediary-centric star structure, as shown in the following figure. In this star structure, the coworker object no longer interacts with another object by direct contact, and instead interacts with another object through the Mediator object. The existence of mediator object ensures the stability of object structure, that is, the structure of the system does not cause a

We usually use the myabtis when not often need to use map to pass parameters, is generally the following steps: public List But if you need to put a lot of fields, and each property name is very long, it is very difficult to get, here can use the Java reflection method to automatically assemble the map, the following is the implementation of the blogger: public class Test {//Implement eff

large quantities, hit 80 percent");returnStandardprice *0.7; }}Then there is the context class:/** * @Description responsible for interacting with specific strategies, specific algorithms and direct client separation. * @author Ni SHENGWU * */ Public class Context { PrivateStrategy strategy;//through the construction method to inject the specific strategy, if using spring, you can directly use @resource to inject the Public Context(Strategy strategy) {Super(); This. strategy = strategy;

) {One single = new single (); }13 re Turn single;14 }15}Below we explain that lazy thread is unsafe, usually we recommend writing a hungry man, because it is thread-safe.When multi-threaded access to lazy-type, because of the lazy way of the common data in the operation of multiple statements.Two threads, line Cheng and line Cheng call the GetInstance method at the same time, when thread 1 executes the If judgment, single is empty, there is no time to execute a s