Java

An online 2k game, every second is scary. The traditional hibernate direct plug-in library is basically not feasible. I'm going to deduce a lock-free database operation in one step.1. How to lock in concurrency.A very simple idea to convert

20145331 Java Programming 2nd Experiment Report two Java object-oriented programming one, experimental content1. Initial mastery of unit testing and TDD2. Understanding and mastering the object-oriented three elements: encapsulation, inheritance,

Processes and Threadsfirst introduce the next process and threadProcessprocess is the program in execution, the concept of the procedure is static, the process is the concept of dynamic. Threadsa child task that runs independently in a process is a

In Java, although it is not necessary for programmers to manually manage the life cycle of objects, it is necessary to use soft and weak references if you want certain objects to have a certain life cycle (for example, the JVM will automatically

Constant:A constant is an identifier whose value is constant during run time, and constants can only be referenced in the program and cannot be re-assigned.Naming rules for constants:1. In Java, adding the final keyword to a variable declaration

All development teams are working on a problem by reusing code that has been tested and validated, and how to reduce development efforts. A proven approach is to optimize application development by effectively using Java inheritance. Inherited in a

Collection interface:1. The collection can be understood as a dynamic array of objects, but the contents of the objects in the collection can be arbitrarily expanded.This means that the operation in the collection is more convenient, easy to add or

Original: http://www.cnblogs.com/xrq730/p/4890052.htmlThe difference between a character stream and a byte stream Public Static voidMain (string[] args)throwsexception{File File=NewFile ("D:/writer.txt"); Writer out=NewFileWriter (file); //declares

The procedure in the previous essay, after thinking, found that using too many static functions and not incorporating object-oriented ideas made a change:1 Importjava.util.ArrayList;2 Importjava.util.Collections;3 Importjava.util.List;4

When an object has more than one member variable and the object needs to be initialized when it is created, it is inconvenient to use the constructor directly to initialize it. For example Public classBuilderdemo {Private Final intservingsize;

I. The concept of generics (why generics are needed)?First, let's look at the following short code:1 public class Generictest {2 3 public static void Main (string[] args) {4 list list = new ArrayList (); 5 list.add ("Qqyumidi");

Generics are added in Java 1.5, and the details of generics are not discussed here, which is very clear in the fourth edition of Thinking in Java, which is about the super and extends keywords, and why there are different limitations when using

Recently, Bo Master to do the project needs to do a WAP version of the mobile phone address Book, the afternoon to organize the next idea, found that the user name how to sort ah? Product manager said to make and mobile phone directory similar to

Of course, you need to capture it first with a try catch, but note that the string in the parentheses of new Exception ("") is actually an exception, so get it with Ex.getcause (). GetMessage ()1 intDylist = DYDAO.FINDBYHQL ("from zczcsqdy where

Objective:just came back early today and summed up the basics of Tomcat and HTTP. 1, TomcatWeb-related conceptsWeb: The meaning of a Web page resource includes all resources on the server.Web Resource classification:Static resources: Resources

Java timed tasks that perform tasks on a daily schedule. The following is the entire code for this example.public class Timermanager {Time intervalPrivate static final Long Period_day = 24 * 60 * 60 * 1000;Public Timermanager () {Calendar calendar =

Summary of learning contents of teaching materials input and output inputstream and OutputStream From an application perspective, the input stream can be used if the data is to be fetched from the source, and output streams can be used if

A few days ago wrote a memory leak article. This article describes the memory leaks related knowledge: http://blog.csdn.net/u010590685/article/details/46973735But the sample given here is not very good, see a very good example here today to add to

[Design mode] Singleton Mode1. Introduction to singleton Mode The single-profit model is one of the most widely used models, and may be the only design model that many junior engineers will use. When this mode is applied, the class of the singleton

GOF Design Mode 1: Singleton design mode, gof Design Mode1. core functions of the singleton design model: Ensure that a class has only one instance and provides global access points for this instance.2. Common application scenarios: Job Manager of