what is rule engine in java

, now you can go to phase two.1. Html+javascript don't have to say, master how much to see oneself grasp, css do understand2. Jsp+servlet, you need to focus on a few, request,response,session, followed by application.Also you need to know the difference between redirect,forward, the life cycle of the servlet, etc.3. Label Aspects: (1) Master El Expression, (2) It is best to master the JSTL tag, will not, but if you master the JSP tag, learning Jstl

Java learning-What is Servlet and java learning servlet After learning the thirteen J2EE specifications, we just had a simple understanding of them. What we need to do next is to study them in depth. Among the thirteen specifi

Original link: http://blog.csdn.net/zhangjg_blog/article/details/20380971 What is a Java virtual machine as a Java programmer, we write every dayJava code, the code we write is executed on something called a Java virtual machine.

classes.Initially, these features may seem like they is added strictly for syntactic consistency, but I generally find that once You know about a feature, and you often discover places where it is useful.StackOverflow The static keyword in the above example is redundant (a nested interface are automatically "static") and can be removed wit H no effect on s

I heard that PHP development is fast? What is faster than JAVA? Many people say that PHP development is very fast. Is it true to develop a website in just a few days? Are those frameworks a class or something else?

Java EE Cluster Generally speaking, Java EE cluster technology includes "load Balancing" and "failover" two parts. In the above illustration, load balancing means that a target object is requested by many client objects simultaneously. The load balancer is between the caller and the callee, and you can distribute th

The encoding of the. java file is the encoding of string stringsThe encoding of the file file is the encoding of the document content.The encoding of the request's setting is the encoding of the InputStreamThe default code for the JVM (the charset of this Java virtual machin

from 32,768 ( -2^15) to 32,767 (2^15-1), when the variable is initialized, the default value for the short type is 0, and generally, because the Java itself transforms, it can be directly written as 0. The int:int is stored in 4 bytes with a range of-2,147,483,648 ( -2^31) to 2,147,483,647 (2^31-1), and the defaul

Original address: http://www.onjava.com/pub/a/onjava/2006/10/04/what-is-java-content-repository.html? Page = 4 JSR-170 defines itself as an independent, standard way to access each other with the content repository. At the same time, it also makes its own definition of the content warehouse. It thinks that the content warehouse

Following features of C + + is not there in Java.No pointersNo sizeof operatorNo Scope resolution operatorLocal variables in functions cannot is staticNo Multiple InheritanceNo Operator OverloadingNo Preprocessor and macrosNo user suggested inline functionsNo GotoNo default ArgumentsNo unsigned int in JavaNo--Operator in JavaNo stack allocated objects in JavaNo delete operator in

What is java ?, Java? Java is a software technology.Is a language developed by SUN Microsystems, Inc..Is a computer language developed for the Internet.It

as Access Control, search, version control, and lock content.For a period of time, different CMS systems developed by various manufacturers have emerged on the market. These systems are built on their respective content warehouses.The problem arises. Each CMS developer provides their own APIs to access the content repository. This has plagued application developers because they need to learn the APIS provided by different developers and their code is

String path = Request.getcontextpath ();String basepath = request.getscheme () + "://"+ request.getservername () + ":" + request.getserverport ()+ path + "/";%>Request.getscheme ();//Can return the protocol used by the current page, that is, "http"Request.getservername ();//Can return the name of the server on which the current page is located, in fact, is the ge

. The key to inheritance lies in the flexible use of the two inheritance methods.The meaning of the interface here is different from that in Java or C. This interface indicates the signature of all public methods in a class.So the ISA relationship is about behavior. Hasa relationship, also known as object combination. In fact, there are two hasa

We sometimes convert a Java object into a byte stream or restore it to a Java object from a byte stream. For example, to store Java objects to hard disks or transmit them to other computers on the network, we can write this process by ourselves.CodeTo convert a Java object into a byte stream of a certain format for re-

declared by a volatile and a field value of type double, although not guaranteed to be atomic in its jmm, is allowed.As long as it does not violate this rule, the JVM does not care what thread the value of the data comes from, which makes the Java language in the design of parallel operations extremely simple for mult

Develop our exampleProgram Jackrabbit has been configured. Now let's create our sample program. This example program will call the JCR-170 API. Obviously, we need to do two things: adding, deleting, modifying, and querying data in the background (persistence layer), and developing the corresponding UI (web layer ). First, Let's define a DaO interface. This interface blogentrydao. Java is as follows: Cod

Develop our example ProgramJackrabbit has been configured. Now let's create our sample program. This example program will call the JCR-170 API. Obviously, we need to do two things: adding, deleting, modifying, and querying data in the background (persistence layer), and developing the corresponding UI (WEB layer ). First, Let's define a DAO interface. This interface BlogEntryDAO. java is as follows:Public i

variables, then even if the JSP script finishes executing the response, the global variable will remain in the JVM memory that the Tomcat initiates.Do not know the landlord can see clearly not. "Is Java a different thread called or the same object, that's not a mess?" ”About this question. As I mentioned above, the special object is the same. It receives a reque

What is the function of string args[in this program? I've learned c++,string args[] like what's in C + +? If it is C + +, want to output string as long as write coutSince string args[] or string[] args represents an array of strings to the main method, then System.out.println (args[]); Why is it an error, args[]