Java

If the object of a class is finite and fixed, such as the seasonal class, it has only 4 objects, such as a finite and fixed class, which we have in Javais called an enumeration class.The enumeration class is new to Java 5, which uses the enum

For this code, a lot of netizens are full of questions, first there are many, not careful, did not write the pair class, to compile.Certainly compiled, the pair class is on the first two pages of the other code.And here, the features of generics are

A simple Java thread pool can be obtained from executors.newfixedthreadpool (int n). This method returns a thread pool with a thread capacity of N. Then execute execution of the executorservice.Now gives an example.Package

 Lin Bingwen Evankaka Original works. Reprint please specify the source Http://blog.csdn.net/evankakaThis article will mainly explain the use of the collection in Java and the difference, mainly on the list, Set, map of the principle, the use of

1. Basic concepts of abstract classesA. Many objects with the same characteristics can be abstracted as a class, and many classes with the same characteristics and behaviors can be abstracted as an abstract classB. Classes declared with the abstract

Composite definition: Organize objects in a tree-shaped structure to achieve a "partial-overall" hierarchy, making the client consistent with the use of individual objects and composite objects.Composite is easier to understand, think of composite

These days reading, began to see the Java inside the class, began to think back to see, you can read, the results see the time to monitor there is also no read.In other words, I write Java code has a problem, it may be written in C + + and C written

Download the GitHub Demo sample code for this series of articles in the following ways:git clone https://github.com/davenkin/gradle-learning.gitGradle's most frequently used plugin is Java plugin. Like other plugin, Java plugin is nothing special,

Exceptions: Program exception events that occur due to hardware device problems, software design errors, and so on during operation.There is no perfect program in the world. There are always various problems in the procedure. Therefore, it is

/**** @Title: Convertmap* @Description: Using generic Map-to-bean* First, the type of the incoming entity bean is instantiated by reflection to get all the methods of the bean.* Traverse all key of map, capitalize key first letter, prefix add set,

1. DefinitionA container is an interface between a component and the underlying service details. Before a Web component, an enterprise bean, and so on can be executed, it must be assembled into a Java EE module and deployed on a container. Such as:　　

Write a Test.proto fileOption Java_package = "Com.proto"; Option Java_outer_classname = "Firstprotobuf"; Message testbuf { required Int32 ID = 1; Required String Url = 2; }Generate Java files with

Let's be clear: These three methods are all methods defined by the Bytebuffer abstract base class buffer, and Bytebuffer only inherit them. **************************************************** second, You need to understand the concept of buffer,

Two-dimensional code introductionTwo-dimensional barcode/two-D code (2-dimensional bar Code,qrcode) is a certain geometric pattern in the plane (two-dimensional direction) distribution of black-and-white graphics to record data symbol information,

1. Work Flow(1) The Java server creates the WebSocket instance and maintains and waits in the Tomcat container.(2) A client WebSocket instance is created in the browser, then the server is connected and if the connection succeeds, the server

Apache Commons is a very useful toolkit to solve a variety of practical common problems, here is a summary table,More Information Access http://jakarta.apache.org/commons/index.htmlBeanutilsCommons-beanutils provides packaging for the Java

The Simplehashmap implemented in the previous section, there is no resolution to the conflict, this section we continue in depth Because the size of the table is limited, and the key collection range is infinite, so hope that the hashcode scattered,

Recently busy, want to study with you and discuss some of the Java source code and its implementation of the data structure, Not a high-level thing, an interested casual look 1. Why map, take HashMap as an example Many times we have this requirement,

JavaEE & amp; HTML5 WebSocket  1. Workflow    (1) create a WebSocket instance on the Java Server and maintain and wait in the Tomcat container. (2) create a client WebSocket instance in the browser, and then connect to the server. If the connection

Verify email address and Regular Expression /*** Verify that the email address is correct ** @ param email * @ return */public static boolean checkEmail (String email) {boolean flag = false; try {String check = "^ ([a-z0-9A-Z] + [-| \.]?) +