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1.1 complex bonus Calculation
1.2 simplified bonus Calculation System
1.3 Non-use mode solution
1.4 What's the problem?
Decorator (decorator) 1 Scenario problem 1.1 complex bonus Calculation
Consider a practical application: how to implement flexible bonus calculation.Bonus calculation is a relatively complex function, especially for the calculation of bonuses for bus
If we forget the root user's password in the production environment, there are two methods under Linux, the first one is single-user mode, which is similar to the security mode of Windows when the system starts.The method is to restart Linux first, (the restart command has reboot, LINT6, Shutdown-r now.) The shutdown command has init0, Pweroff).Edit GrubThen go to the next stepEnter the LS command, and then
Core role:-guarantees that a class has only one instance and provides a global access point to access the instanceThe manager of the computer, once created a task manager, then to create or original.One, single case mode: a hungry man type.A hungry man: regardless of how many objects you create are the same objectSecond, lazy-type: with delayed loading. Join the synchronization, the call efficiency is low.Three, double detection lock: Due to compiler
Before the tutorial begins, we need to understand the two key keys to entering DFU-the power and home keys, which are located at the top of the iphone and below the screen, as shown below.
Normal restoration of Law I.
1, turn your iphone off.
2, at the same time press and hold the switch machine keys and home keys.
3, when you see the white Apple logo, please release the Switch machine k
Msgprocessor=Newmsgprocessor (); Msgprocessor.setmsg (str); MSGPROCESSOR.SETFC (FC); String result=msgprocessor.process (); SYSTEM.OUT.PRINTLN (result); } }It's a bit of a chain of responsibility to write here. Ha haThe previous image first:Create Htmlfilter,sensitivefilter instantiation Filterchain, and pass MSG and Filterchain instantiation objects into Msgprocessor construct Msgprocessor, Call the Msgprocessor.process method, which is actually called the Filtercha
fish swim quickly. So you can define an interface iswim, and then just use Slowswim,generalswim, Quickswim three classes to implement this Iswim interface respectively. Slowswim,generalswim,quickswim these three classes are called behavior families. How to use this strategy mode? Or, according to the fish above, define an abstract fish class, in which fish has a iswim field, which is passed through the construction method. Now there's a fake with a w
Document directory
1.1 data export application framework
1.2 Basic Framework knowledge
I 've been doing Java for ten years. Recently, I decided to keep up with the trend and write something on my blog. Even if I had to sort out and summarize my knowledge, I also want to continue communicating with my friends.Write down the content of the design pattern, namely, the 23 GoF pattern. First, start with the factory method pattern that everyone is most familiar with. This is the simplest and man
Cocos2D-Android-1 source code explanation: 1. Cocos2D
/** Copyright (C) 2007 The Android Open Source Project ** Licensed under the Apache License, Version 2.0 (the "License "); * you may not use this file before t in compliance with the License. * You may obtain a copy of the License ** http://www.apache.org/licenses/L
_ instance; /// /// Helper, not involved in real construction /// Private Static Object _ lockhelper = New Object (); /// /// In this case, attributes are used and parameter passing is not supported. /// You can change attributes to methods to support parameter passing. /// Public Static Singleton1 instance{ Get { // A single thread does not need to use double check If (_ Instance = Null ){ // Use lock to avoid Multi
1. Mode:
The simple Factory mode is the class creation mode, also called the Static Factory Method mode.
It is determined by a factory object to create a product instance.
2. Three roles:
1. Creator role: create a product object u
The opening crap .Today we are working together to learn the memory allocation of the JVM, the main purpose is to lay the foundation for our Android memory optimization.have been thinking in what way to present this knowledge point can make us easy to understand, the final decision to use the method is: schematic + source code Analysis .Welcome to my personal blog: Senduo ' s blogWe would like to be able to write code in the normal time, we can know t
This. Instance =NewSingleton (name)}return This. Instance}//TestConst A = singleton.getinstance (' a ')//to get an instance through getinstanceConst B = singleton.getinstance (' B ') Console.log (a= = = B)Because JavaScript is a non-class language, and the global object in JS conforms to the singleton mode two conditions. Many times we use the global object as a singleton pattern.var obj = {}The practice of the frame layerOne way to implemen
The idea for implementing the singleton mode is:
1. A class can return a reference to an object (always the same) and a method to obtain the instance (it must be a static method, usually using the getInstance name );
2. When we call this method, if the reference held by the class is not null, this reference is returned, if the reference of the class persistence is null, create an instance of the class and a
1. Theoretical Model
This theoretical model is very simple, just a unit of work is completed, followed by the unconditional execution of the next unit of work. Every workflow system directly implements this mode, which is an important cornerstone for workflow operation.
2. Application
This mode is clear, but it is most widely used.What is interesting is that
Definition(From
1. the decorator pattern attaches additional responsibilities to an object dynamically.2. decorators provide a flexible alternative to subclassing for extending functionality.
1. dynamically add some additional responsibilities to an object.
2. For the added function, the decorator mode is more flexible than the subclass generation
functionCreatedb () {3 return NewDbmysql ();4 }5 }6 7 classSqlitefactoryImplementsfactory{8 Public functionCreatedb () {9 return Newdbsqlite ();Ten } One}3) The client can call the factory$fact=new mysqlfactory (); $db=$fact>createdb (); $db$conn();4) What do we do when we add the Oracle connection method? Only need to add factory and method on it, no need to modify factory.1
What is a singleton mode: ensure that only one instance object exists for a class and provides a global access point;Application Environment: when only one object, one instance, is neededFor example: WinForm can only create one form at a time, only when one instance object is neededCode: Public classsingleton{//Determine whether the instantiation of a class is unique through a static private variablePrivate StaticSingleton MYINSTANCD;PrivateSingleton
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