core java volume fundamentals

Java Web Basics Tutorial (ii) Development fundamentals reprint: Future Wei LaiObjectiveThe Java Web is a technical implementation of a network application based on the b\s (browser \ Server) architecture. This structured Web application is used by a large number of enterprise-class applications. As the scale of Web applications grows, the traditional Web developm

. Common packages: Java.lang:language Java core package, Object System String throwable jdk1.2 version, the class in the package is automatically imported. java.awt: Defines the objects that are used for the development of the Java graphical interface. Javax.swing: Provides all the Windows desktop applications including the controls, such as: Frame, Dialog, Table

function in the current position, and then writing the annotation information to the attribute table of the element.Then, when you do the reflection, the virtual machine takes all the life-cycle annotations out of the RUNTIME into a map and creates a Annotationinvocationhandler instance to pass this map to.Finally, the virtual machine will use the JDK dynamic agent mechanism to generate a proxy class for the target annotations, and initialize the good processor.So, an example of an annotation i

a single thread for extracting files, because multiple threads can take advantage of the resources of each core more fully.While multi-threading can improve program performance, it is much more complex to program than a single thread, taking into account threading security issues. Therefore, in the actual programming process, according to the actual situation of the specific choice.About the origin of the process and thread, for the time being so muc

Java Fundamentals 05: Object-orientedOne, arraymemory management for arrays : A contiguous space to store elements. Int [] arr = new int[];Create an array of type int,arr is just a variable, just a reference address to the array, local variables exist in a stack,java There are no global variables, only member variables , stored in the heap areaCommon errors in a

creation of a Java.lang.Class object for a class or interface Initializes a subclass of a class To run a main class directly using the Java.exe command 2, Reflection (class loader overview and classification) A: Overview of Class Loaders Responsible for loading the. class file into memory and generating the corresponding class object for it. Although we do not need to care about the class loading mechanism, we understand this mechanism and we can bette

AssertionOn the internet to find a lot of information on the assertion of the blog Knowledge Point Summary, coupled with the Java Core Technology book content, organized the study blogThis blog is very detailed, see http://blog.csdn.net/silentbalanceyh/article/details/4564884 content1, the concept of assertionsThe assertion mechanism allows you to insert some survey statements into your code during testing.

construction methodPrivateSingletontest () {}Defines a static private variable (uninitialized, does not use the final keyword, and volatile guarantees the visibility of the instance variable when multi-threaded access is avoided, and is called by another thread when the other variable property is not assigned when instance initialized)Privatestatic volatile singletontest instance;//defines a common static method that returns an instance of this type public Span style= "COLOR: #0000ff" >static S

proxy, invoke service Ihelloservice proxy= (ihelloservice) rpcproxyfactory.createproxy (Ihelloservice.class, "HelloService", 3000); SYSTEM.OUT.PRINTLN ("Service invocation Result:" +proxy.sayhello ("Jiyichin"));which Createproxy the implementation of the interface is as follows:/** * Create Remote Call proxy * @paramobjClass Interface Class object * @paramserviceName service name * @paramURL service address * @paramtimeout Connection Timeout period * @ return * @thro

WebSocket Protocol IntroductionThe WebSocket protocol is a network protocol that allows two connected ends to have full-duplex message communication on a single TCP connection.In the WebSocket scenario, the connection is established in a way that interacts with HTTP and websocket endpoints. The connected party sends a specially crafted HTTP request to launch the URL that contains the websocket it wants to connect to. It starts the activity and is called the Open stage handshake . If the server i

proxy= (ihelloservice) rpcproxyfactory.createproxy (Ihelloservice.class, "HelloService", 3000); SYSTEM.OUT.PRINTLN ("Service invocation Result:" +proxy.sayhello ("Jiyichin"));among Createproxy the implementation of the interface is as follows:/** * Create Remote Call proxy * @paramobjClass Interface Class object * @paramserviceName service name * @paramURL service address * @paramtimeout Connection Timeout period * @ return * @throws Exception */publicstatic Object c

(overloading) are different manifestations of Java polymorphism, which is a representation of polymorphism between a parent class and a subclass, and overloading can be understood as a concrete representation of polymorphism.Overloading is the same method that can be processed differently depending on the input data.Overrides are when the subclass inherits from the same method as the parent class, entering the data, but to make a response different f

the professional knowledge and apply it well to become a skill, the future can be better life. Do you feel like you're doing something more successful? What's your experience? Be more satisfied with the things that you love.Do what you love should be more than any one thing to invest, of course, within a certain range of reason, so you will have unexpected harvest. What do you think of the Java programming course? What kind of

Nineth Chapter Member access rights: Publicly public with + means that any method is accessibleProtect protected with # indicates that a class within a package or a method of a derived class that declares a protected Member's class is accessible.Proprietary private-means that only the method of the class that declares the private member is accessible.Package-level, or Default no representation: Package-level members can be accessed by methods of all classes within the package (frie

amount of an immutable value in a program that is predefined in a program. such as final int a = 5 ;Constant pool?? Chang introduced to avoid the frequent creation and destruction of objects and affect system performance, which implements the sharing of objects. This is an implementation of the enjoy meta-mode.Second, Java constant poolJava's constant pool can be subdivided into the following three categories:

Java Multithreading Fundamentals: The Origins of processes and threadsIn the previous article, we've covered the basics of Java, and now we're going to talk a little bit more difficult: Java concurrency programming. Of course, Java concurrent programming involves many aspect

String is one of the core classes in java programming language. It is widely used and widely used.But do you know what is the direct string volume? Do you know there is a string resident pool? The string resident pool can be used to cache the direct string volume. What is a direct