ibb talk

* @author Liuyazhuang * */public class Projectassistant ex Tends employer {public projectassistant (String name) { setName (name); Employers = null;//Project assistant, indicating that there is no subordinate, public void Add (Employer employer) { } public void Delete ( Employer employer) { }}Composite Package Com.lyz.design.composite;import java.util.arraylist;/** * Define composite Class Projectmanager class * @author Liuyazhuang * * /public class

clutter of the object code that needs to be cast. 2. Use generics to easily find and resolve bugs at compile time Third, the use of rewriting the simple version ArrayListUse generic code as follows:? 123456789101112131415161718192021222324252627282930313233 package javaBasic.generic;/*** 简易版ArrayList*/class ArrListT>{private T obj; public T getObj(){return obj;}public void add(T obj){this.obj = obj;}}public class TestArrayList{public static void main(String[] args){Arr

! "); } else { rh.handlerequest (request);}}} Package com.lyz.design.cor;/** * Concretehandler * @author Liuyazhuang * */public class Tlrequesthandle implements Request Handle { RequestHandle RH; Public Tlrequesthandle (RequestHandle RH) { THIS.RH = RH; } public void HandleRequest (Request request) { if (Request instanceof Leaverequest) { System.out.println ("to leave, Project leader approval! "); else { rh.handlerequest

First, UML diagramSecond, the conceptappearance mode: provides a consistent interface for a set of interfaces in a subsystem that defines a high-level interface that makes this subsystem easier to use.Third, the descriptionQ: When is the appearance mode used?A: divided into three stages :(1) First of all, in the early stages of design , it is necessary to consciously separate the different two layers.(2) Second, in the development phase , subsystems tend to become more and more complex because o

complex business scenarios.Methods of Cyclicbarrier:1. Await () Use this method to cause the current thread to block at the fence point and wait for all threads.2. Await (long timeout, timeunit unit) increases the timeout parameter, and waits for a timeout to throw an exception.3. Getnumberwaiting () returns the number of participants currently waiting at the fence. This method is primarily used for debugging and assertions.4. Getparties () This method can get the number of threads specified in

of T1, because D1 is uninitialized in time, so the default constructor is called when overloaded, and the output of this was is;(b) When creating a T2 object (with parameters), follow these steps:4, executes the constructor of the D1 class Date, because D1 is not initialized in time, so the default constructor is called when overloaded, and the output is the is date.5, executes the constructor of the D2 class date, according to time time (int a):d 2 (a), found that D2 has been initialized to D2

After learning the bubble sort, you will find that this algorithm is constantly comparing exchange. Simple and direct, obviously gives a kind of tedious feeling. Is there any better algorithm? Of course it is, no, it sucks.:-PThis article describes a better-bubbling sorting algorithm: simple selection sortingSee " Choice " The two words estimate also guessed twos. Yes, the idea of this algorithm is that I choose to swap it for the position of the most suitable digit .In doing so, we have greatly

resolve it.When Performance Monitor shows a memory leak, and BoundsChecker cannot detect it, there are two possible: the first, a sporadic memory leak occurred. When you make sure that you use Performance Monitor and use BoundsChecker, the program runs in a consistent environment and operation method. Second, an implicit memory leak occurs. At this point you need to re-examine the design of the program, and then carefully study the performance Monitor recorded counter value of the change graph,

); "[Object Object]"It is clear that this method does not accurately judge that a person is an instance of the person class, but can only be judged with the instanceof operator, as follows:Console.log (person instanceof person);//Output is true3. Determine the native JSON object:var Isnativejson = window. JSON Object.prototype.toString.call (JSON); Console.log (Isnativejson);//The output is "[Object JSON]" indicating that the JSON is native, otherwise not;Note: the Object.prototype.toString ()

is more complex because: Need to handle different node types, very cumbersome A multiple comparison operation is required to move the node down Need to move up to split the 4-node node There are a number of scenarios for splitting 4-node nodes 2-3 Find trees are more complex to implement, and in some cases the balancing operation after insertion may result in reduced efficiency. The improved red-black tree based on the 2-3 find tree is not only more efficient, but also

following notation is only to differentiate semantics), then the identifier STR has the double semantics: first, the type is char* The const address constant whose value is equal to the address of the first element in the array, that is, Str is equivalent to (char* const) str[0]; second is the syntax object that represents the entire str[] array. in sizeof (str), the meaning of STR is str[], so the size of the entire array is returned (this size is determined in the previous array definition),

control.Advantages:(1) The decoration function of the class is removed from the class, so that the original class can be simplified.(2) effectively distinguish the core functions of the class from the decoration function, and can remove the repetitive decoration logic in the related class.Iv. implementation of C + +(1) Conponent is the Concretecomponent class: Here is the person class#ifndef person_h#define person_h#include (2) Decorator and Concretedecorator: Here is finery and its subclasses#

First, UML diagramSecond, the conceptSingleton mode: guarantees that a class has only one instance and provides a global access point to access him. [DP]Usually we can have a global variable that makes an object accessible, but it doesn't prevent you from instantiating multiple objects. One of the best ways is to have the class itself responsible for protecting its only instance. This class ensures that no other instance can be created, and that he can provide a way to access the instance.Third,

instance */#include Run as follows:You can see that the program will enter relevant content in the corresponding file every 10s. And using PS, you can see that the process is running in the background.Enter the command in the terminal:ps-ef|grep daemonThe results appear as follows:Little TricksTail Command: Writes the file to standard output starting at the specified point. Using the-f option of the tail command makes it easy to see the log files that are being changed, TAIL-F filename will dis

file can beThe important thing is to get the nr==line problem fixed.Because awk supports (nr==23| | NR==25)Like this, it can be a lot of choiceThen the line number file with TR and sed after processing can be complete () in the middle of the type of a line of textJust copy the past to awk.I've done an experiment, I'm sure I've got it done.But the code is in the history after the shutdown.I'm too lazy to turn over.Just summed up so much, not much to say, ready to wash and sleepThis article comes

two is also clear, session cookie for a session, sessions end The cookie disappears, and the persistent cookie is just a piece of text (usually encrypted) that exists on the client's hard drive, and may be subject to cookie spoofing and cross-site scripting attacks against cookies, which are not as secure as session cookies.Usually the session cookie is not used across windows, and when you open a new browser window into the same page, the system will give you a new SessionID, so that the purpo

the teaching video, the book or the website is not the same, not the same as two results, you wrong or your also right, learn to analyze problems, learn to understand each command, how to perform these, understand him than you remember how to use better.5. Ask a question, this is the distress of all asked questions, especially recommended to read the wisdom of the question before the book. Resources to find their own. (Map source online)650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02

# Group:rootuser::rw-group::r--other::r--...3. Modify the permissions of a file, such as: Modify Linuxprobe.txt and Install.txt permissions[Email protected] tmp]# chmod 733 linuxprobe.txt[Email protected] tmp]# chmod 573 install.txt[Email protected] tmp]# ls-lTotal 8-r-xrwx-wx. 1 root root 0 Mar 3 04:40 install.txt-rwx-wx-wx. 1 root root 0 Mar 3 04:41 linuxprobe.txt-rw-r--r--. 1 root root 4361 Mar 3 04:41 permissions.txt......4. Restore Legacy Permissions1) CD to the directory where the Permissi

difficult to manage connections without a robust connection pooling mechanism.Therefore, it is necessary to build a robust, manageable pool of connections.PS: About connection pool content, refer to from http://www.importnew.com/8179.htmlThreads thread pool, connection connection poolthreads : The smallest unit of a program execution flow, an entity in a process, a relatively independent, scheduled execution unit, is the basic unit of the system's independent dispatch and dispatch;Multithread

, retrieval, storage and management, and the design and implementation of the basic methods of geospatial information analysis. This paper introduces the basic of GIS algorithm, coordinate transformation algorithm, data transformation and organization algorithm, space measure algorithm, index algorithm, interpolation algorithm and so on, which basically covers some fundamental GIS algorithms that we use daily. Of course, it would be better to pick up our calculus and linear algebra again before