Java

AWT and swing are different, swing is based on a lightweight component on the weight awt, and the AWT development graphical interface is not as good as swing on a cross-platform basis, so it's generally better to use swind components!Package

Recently many companies because of security problems by various torture, our company in this regard, we need to encrypt the database connection, on the Internet easily found a solution, here to share to everyone, but the content of this solution has

The regular expression is a kind of character processing tool, which can find, extract, divide and replace the string. A regular expression can be understood as a template to match a string. Using regular Expressions in Java, we pre-define a rule

Java Automatic garbage collection (Automatic garbage Collection) is an automatically reclaimed memory that is no longer used on the heap , and new objects are recycled if they are not referenced in the program. There are many implementations of

Java file operation is too basic, lack of many practical tools, such as the operation of the directory, support is very poor. If you often use Java to manipulate files or folders, you will find it frustrating to write the code over and over again,

JUnit provides us with some auxiliary functions that help us determine whether the method being tested works as expected, often referred to as assertions. Let's take a look at the various assertions of JUnit. 1, Assertequalsfunction prototype

The recent machine memory is full, in addition to new machine memory, but also should be a good review of our code, a lot of code to write too casually, these bad habits or the language of the program is not understood to be a good suppression of

http://www.ibm.com/developerworks/cn/java/j-lo-jdk7-1/JSR292: Supports dynamic type language (invokedynamic)In recent years, the emergence of more and more JVM-based dynamic languages presents new requirements and challenges for the JVM. In fact,

The queue interface is the same level as list and set, and both inherit the collection interface. LinkedList implements the queue interface. The queue interface narrows the access to the LinkedList method (that is, if the parameter type in the

In a separate primitive program, there can be only one public class, but there are many non-public classes.In addition, if no class is public in a Java program, the Java program's file name can be arbitrarily named.Document comments, which start

It is common to add a limit to the parameters of a method, such as a parameter that represents an index that cannot be negative, a reference to a key object cannot be null, or some processing, such as throwing the corresponding exception information.

Because many years ago just learn Java when used to Hashtable time is more curious why the second T is lowercase, this does not conform to the Sun's style ah, the entire JDK is the standard hump, so with this question over a lot of books, see a lot

Before explaining the use of finalize (), there are a few points to be set about the Java garbage collector: "Object can not be garbage collected": Java garbage collection follows a feature, that is, can not be recycled without recycling.

Procedures and considerations for deploying a Java Web project with Tomcat under Linux (original)I. Installing the JDKTo http://www.oracle.com/technetwork/java/javase/downloads/index.html download Javase 6 Update 27Choose Linux x64-rpm Installer or

First, a JXL package is required: http://download.csdn.net/source/2928301. Generating Excel requires a manual write query that queries the data in the Oracle database and writes it to the Excel file.2, through Excel to read the data to Oracle, also

Here are three concepts to start with:JVM----JAVA Virtual machineJava Virtual machine: Provides the same interface to bytecode, providing different interfaces to the operating system to accommodate each OSJRE----JAVA Runtime EnvironmentJava Run-time

[SSO single-point series] (7): CAS4.0 SERVER authenticates users through databases, ssocas4.0 In the previous articles, I briefly introduced the authentication method of the server. By default, it is directly configured in a bean called

Background thread (daemon thread) and background thread daemon There is a Thread that runs in the background, and its tasks provide services for other threads. Such threads are called "Daemon Threads ), also known as "daemon thread ". A

Error 404-Not Found. No context on this server matched or handled this request., handled Originally, sae was used properly. As a result, the application deployed the next day suddenly got worse. Various Error 404-Not Found. No context on this

51_52 creates and calls the dynamic class instance object, 51_52 instance Package com. itcast. day3; import java. lang. reflect. constructor; import java. lang. reflect. invocationHandler; import java. lang. reflect. method; import java. lang.