Java

In this article, I will outline the changes required to support the message introduced in the 1.4 Java EE specification. I will specifically analyze the requirements for JMS 1.1 and the new restrictions that are used, the new concepts associated

In the past more than 10 years, the elements of object-oriented language design have been the core of inheritance. Languages that do not support inheritance, such as Visual Basic, are ridiculed as "toy languages" and are not suitable for real work.

Scala is written specifically for the Java™ platform, so its syntax design makes Java code-coding people feel relaxed. At the same time, Scala provides the JVM with the inherent power of functional languages, and starts with these functional design

Whole and part Remember this proverb, "the whole is greater than the sum of the parts"? If one individual event is combined into an interacting whole, the result will be much greater than the sum of the individual's actions. Procedures are the

Do not force the conversion of this class! Unlike the terrible null pointer exception, which does not say anything about what is going to happen except to report null pointers, class cast exceptions are relatively easy to debug. Class casts often

Imagined realization relive Recall that the imaginary implementation of the last interface is a legitimate implementation, but does not satisfy some of the unchecked aspects of the interface specification. Let's consider the following stack

Developers familiar with the ms-windows and X Window System event-driven programming models are accustomed to passing function pointers that are invoked (that is, "callback") when an event occurs. The Java object-oriented model does not currently

Most important applications involve a high degree of concurrency and multiple layers of abstraction. Concurrency is associated with resource contention and is one of the factors that cause the deadlock problem to increase. Multiple layers of

Guava Chinese is pomegranate meaning, the project is a Google Open source project, contains a lot of Google Core Java Common library. 1. Fundamental tools [Basic utilities] Make it more comfortable to use the Java language 1.1 Using and avoiding

Some time ago, when I was using Java Swing as a client, there is a need to add a background picture on the main panel, so I found some information on the Internet to study, some netizens said with JLabel to do, by setting its Icon property to

Introduction Memory management has always been a proud and proud capital of the Java language, allowing Java programmers to fundamentally ignore the details associated with memory management and focus only on business logic. But there is no perfect

Groovy metaprogramming provides you with simple solutions to common problems Java next-generation languages have many ways to extend existing classes and other artifacts, and the first two Java next-generation articles explore some of these

A history project, customer requests to change IP, because the system is more remote, there is no source code, through the reverse compilation of IP written dead in the class, the reverse-compiled code can not be modified, after analysis of the code,

Java calls to dynamic-link library DLLs are: JNI (Java Native Interface), Jinvoke,jnative (Java to Native Interface), and JNI is a method provided by Java itself Jinvoke from where to know, as if still need to register to pay, 64-bit JDK, JIR

HTTP Status 500-null Type Exception Message null Description the "server encountered an internal error" prevented it from fulfilling this request. exception Java.lang.NumberFormatException:null Java.lang.Integer.parseInt (integer.java:415)

HTTP Status 500-JDBC exception on Hibernate data access; Nested exception is org.hibernate.exception.GenericJDBCException:could not insert: [Com.ssh.domain.Revert] Type Exception Message JDBC exception on Hibernate data access; Nested exception is

1 introduction of SPI mechanism The full name of the SPI is the service Provider Interface. Most developers may be unfamiliar because this is for vendors or plug-ins. A more detailed description is available in the Java.util.ServiceLoader

1 Preface Sometimes in our program to provide access to the network using proxies, agents include HTTP, HTTPS, FTP, socks agents. For example, set up an agent in IE browser. So we use proxies in our Java programs, like the next two ways.

As a widely used WEB application development technology, AJAX firmly established its position, followed by some of the common Ajax usage patterns. For example, Ajax is often used to respond to user input and then modify part of the page with new

In multithreaded code, it is common to use a single main thread that drives the actions that other threads are responsible for. This main thread sends messages, usually by putting them in a queue, and then the other threads process the messages.