Java

content: ThreadLocal: allows us to create variables that can only be read and written by the same thread, such as a web app that moves a variable from the front to the background, and needs to always be available at any time in the thread of the

Web development, how to deploy a project in Tomcat:Note case 1, in the Conf directory to create a new Catalina\localhost directory, a new XML file in the directory , the name can be arbitrary, as long as and the current file name is not repeated on

1. Collection is a top-level interface to the collection class, and its direct inheritance interface has a list and setCollections is a tool class/helper class for the collection Class , which provides a series of static methods for sorting,

Variables in all programming languages, belong to the most basic part, learning this part of the basic language, variables can be divided into member variables and local variables The declaration format of variables in Java is as follows, if the

The Vector class provides the ability to implement a growing array, and as more elements are added to it, the array becomes larger. After you delete some elements, the array becomes smaller. Vector has three constructors, public vector (Int.

In Java, it is not allowed to write code that cannot be executed, and such errors can be categorized in the following ways: ReturnThe statement after return is treated as invalid code. ThrowThe code after throwing an exception directly with

enum+ polymorphic, I did not say wrong, but Enum is not can be inherited, also can not inherit from others, just can realize interface, what talk about polymorphism?But let's look at the phenomenon first: Java code public enum Fruit {APPLE,

Thread First KnowledgeA program without threading is like working with one hand, and multithreaded programs are as much as one hand.A process is a separate unit of system resource allocation, and a thread is a separate unit that can be scheduled to

Seventh re-use classreusing code is one of the many compelling features of Java, but to be a revolutionary language, it is not enough to simply copy and change the code, and it must be able to do more. Everything in Java is carried out around the

Unity3d & Java based PROTOBUF communication implementationA recent study of Unity3d, and the need to develop a communication protocol for the game. Because I was born at the back end, the socket-related communication framework for C # is not

Small fish to do file compression decompression, the beginning and no attention to detail, using the Java JDK Zip Operation Tool classThis causes the problem is the Chinese operation is garbled, or is broken.Check the information to know this is 1.6

It is important to understand the initialization order of each member of the class in Java so that you can have a global understanding of the class. Don't say too much, just look at the following example Class father{ static{ System.

A overload Two Override Tri-Polymorphism I. OverloadMany methods in the same class can have the same name, as long as their parameter declarations are different, and this method is called overloading.As an example: Public classoverload{"

We know that when the spelling to jump in the URL contains Chinese, generally need to transcode processing, to the server side to properly receive and processing, which is the client and server-side communication to the data format

Characteristics of volatileWhen we declare that the shared variable is volatile, the read/write to this variable will be very special. A good way to understand the volatile characteristics is to treat a single read/write of the volatile variable as

Original Address:Turn Java several memcached connection client comparison selectionFlash out of the lightXmemcached 1.2.6.1 Released, so updated Java Memcached Client Benchmark. Compare the performance of the three open source clients under

There can be at most one public class in a Java source file,1) When there is a public class, the source file name must be the same , or it cannot be compiled,2) If there is no public class in the source file, there is no consistency requirement in

The system runs a high CPU alarm, generally can be found through the top or task manager which processes are using the CPU, but this granularity does not let us know more, we need to find out which part of the program is CPU-intensive and what is

When parsing JSON data using Gson, error: caused by:java.lang.IllegalStateException:Expected begin_object but is STRING at line 1 column 3939Cause: There is a problem with the incoming parameter; while ((Len=inputstream.read (data))!=-1) {

JAVA constructor code block, java constructor code   Class G {G () {System. out. println ("I Am a construction method without Parameters");} G (String name) {System. out. println ("I have a constructor, and my parameter value is:" + name) ;}{