practical artificial intelligence programming with java source code

The java. util package contains a series of important collection classes. This article will start with analyzing the source code, thoroughly studying the internal structure of a collection class, and traversing the source code implementation of the iteration mode of the set.

In multithreaded programming, the creation thread can inherit thread directly or implement the Runnable interface. However, there is a flaw in all 2 ways that the execution results cannot be obtained after the task has been completed.If you need to get execution results, you must do so by sharing variables or by using thread communication, which can be cumbersome to use. And since Java 1.5, callable and fut

Run: For (iterator it = O. getsons (). iterator (); it. hasnext ();){ R = (knowledgenode) it. Next (); It. Remove (); // if it is changed to O. getsons (). Remove (r);, the concurrentmodificationexception will be thrown. } An exception occurred. It turned out to be an iterator synchronization problem. The Remove Method of the set used for calling. It is best to use the iterator method. For example, it is no problem to delete the current element using the remove () method of iterator itself. ----

In Java programming or interview often encounter = =, equals () comparison. I looked at the source code, the actual programming summary.1. = == = In Java is the address that compares two objects in the JVM. Better understand. Look

Portal-Basic Java Web Application Development Framework (portal-basic for short) is a fully functional, high-performance full-stack web application development framework, built-in stable and efficient MVC infrastructure and Dao framework (with built-in support for hibernate, mybatis, and JDBC ), integrates basic web application components such as Action interception, form bean/Dao bean/spring bean assembly, internationalization, file upload/download,

? This may be a good idea, because it makes it easier for you to write code, but you overlook an important problem-performance! Just take my unit, my unit is a provincial-level data-intensive Banking Network Center, the peak per second client request concurrency of more than 100, if the request for each client to create a new thread, the CPU time and memory will be amazing, if the use of a thread pool with 200 threads, That would save a lot of system

On the Baidu encyclopedia to find a paragraph definition orm words:Object Relational Mappings (English:Object Relational Mapping, ShortORM, oro/rm, orO/R mapping), is a program technology that enables the conversion of data between different types of systems in an object-oriented programming language. In effect, it actually creates a "virtual object database" that can be used in a programming language. Then

This article describes a Python-based batch conversion method that implements Java source code from ANSI to UTF-8. Share to everyone for your reference. Specific as follows: Like with eclipse of the great gods, may accidentally code becomes ANSI code, need to convert to Utf

congruential (Congruential method) is a very common method of generating random numbers, which is used in many programming languages, the most obvious is Java, and Java.util.Random class is one of the congruence method--linear with congruential (Linear Congruential method), in addition to the multiply with congruential (multiplicative congruential method) and mixed with congruential (Mixed congruential met

Source code analysis of ORM framework: Introduction: Java JDBC, ormframework If you have found an ORM definition on Baidu Encyclopedia: Object relationship ing (English: Object Relational Mapping, ORM for short, or O/RM, or O/R mapping ), it is a program technology used to convert data of different types of systems in object-oriented

iterator are used to check that the Modcount in the replica and list are consistent, assuming inconsistencies and throwing an iterator exception.It is important to note that the for each syntax in Java. After compiling, it is the iterator that is used.For example, the following part of the source Code demo sample:Private class Itr implements IteratorArrayListThi

This article mainly introduces the python implementation of JAVA source code from ANSI to UTF-8 batch conversion method, involves Python for file operations and encoding conversion related skills, A friend of the need can refer to the example of this article describes the python implementation of JAVA

Java =, equals (), hashCode () Source Code AnalysisComparison of = and equals () is often encountered in java programming or interviews. I looked at the source code and summarized it wi

I. Overview of HashMap HashMap is an asynchronous implementation based on the map interface of a hash table. This implementation provides all the optional mapping operations and allows NULL values and NULL keys to be used. This class does not guarantee the order of mappings, especially if it does not guarantee that the order is immutable. II. data structure of HashMapIn the Java programming language, the m

build: Drag-and-drop quick custom build form with rich elements, rich text, upload controls, drop-down boxes, and more -main Attachment structure: Provides an example of a main table and a schedule module (generated by this code generator) -Organizational structure: Unlimited levels, corporate or departmental management -. Employee Management: and organization Department management, can be bound to login system users, authorization data permissions -

the existing class. Instead of changing the form of an existing class, take the form of an existing class and add new code to it. This magical approach is called inheritance, and the compiler can do most of the work. Inheritance is one of the cornerstones of object-oriented programming, and the next section will do the necessary parsing.In terms of composition and inheritance, the syntax and behavior are m

: --- see Java programming ideas-page 489 Emphasize again:The default Object. equals () is only the address of the Object, so a new User (3) is not equal to another new User (3 ). Therefore, if you want to use your own class as the key of HashMap, you must reload both hashCode () and equals (). The following code works properly: Class User {// id number protected

environment.2. Multiple threads share a resource. such as servlets are not thread-safe. The same instance variable is manipulated in its service method, and if multiple threads are accessing it at the same time, there is a thread-safety issue because multiple threads share the variable.3. Perform non-atomic operations on threads.Third, the understanding of JAVAPPerhaps we rarely use the JAVAP tool, because there are a lot of good anti-compilation tools now, but I am here to introduce this tool

Java programming Nashorn instance code, javanashorn instance This article focuses on Nashorn programming in Java. What is Nashorn? Nashorn, pronounced "nass-horn", is the name of a tank in Germany during World War II, and is also the next-generation javascript Engine of

Java Excel File Import DatabaseSource code Servlet Container: Tomcat (or other)Database: Oracle (or other)Framework: JSP + struts1.2Supports data such as volume, Data, date, and clob. Procedure:1. Download the resource and decompress it to get three files: excelimpdatabase Project/test.xls file for testing/ 文readreadme.txt/database table create source