Java

1. Concept of inheritance One of the object-oriented features, you can implement the reuse of the class. The following two ways can be implemented A. Composition/aggregation relationship (contains other classes): Treats a class as a

1. Building a classA. PropertiesB. methodsThe property is the owner, the method for the property service, is the servant.C. building granularity of classesSatisfies the design needs of the program, the properties and methods not involved can not be

ObjectiveEach of the language in some extreme cases of the performance is generally not the same, then I commonly used in the Java language, in reaching 1 million concurrent connections, what will happen, some curious, and some look forward to.This

Java callback function mechanismReference to some of the online information, the following also made some summary for beginners to learn.I. OverviewThere is always a certain interface between software modules, which can be divided into three

1, the hospital Dean query system valueAt present, the information processing of large and medium-sized hospitals is changing from the traditional manual way to the computer informationization construction, a large and medium-sized hospital

Overloading, English name is overload, is defined in a class more than one method with the same name , the number of parameters, parameter types and order cannot be the same. The return type can be the same or different.public class Tstaticoverload {

The file class provides a series of operational methods for reading and writing to directories and filesCreate: Public classFileDemo01 { Public Static voidMain (string[] args) {Try { //Create a fileFile File =NewFile ("FileName.txt");

In each Java program there is a method, public static void main (string[] args) method, this parameter for a long time did not understand, but carefully, it is quite simple, all the parameters of the method is a truth, And this main method is

Reprinted from Http://www.cnblogs.com/lys_013/archive/2012/05/05/2484561.html1. AgreementA. Overview of the overall architecture of TCP/IPThe TCP/IP protocol does not fully conform to the OSI seven-layer reference model. The traditional open System

The Java implementation single-linked list has been described earlier: http://www.cnblogs.com/lixiaolun/p/4643886.htmlIn fact, the main difference between the two is how to determine whether the end of the list:In a single-linked listwhile

Garbage collection mechanismThe Java death garbage collection mechanism is one of the important functions of the Java language. When a program creates objects, arrays, and other reference type objects, the system automatically allocates a chunk of

built-in lock sychronized with volatile;1.volatile essentially tells the JVM that the value of the current variable in the register (working memory) is indeterminate and needs to be read from main memory; Synchronized is locking the current variable,

The film also has an understanding of our common synchronization (synchronized) and lock mechanisms from this article to try a high level.We assume that the reader wants to know more about concurrency. Recommend a book "Java Concurrency Programming

Summary of internal classes in JavaThe inner class is not very well understood, but it is actually a class that contains another class.As a person is composed of physical results, such as the brain, limbs, organs, or an internal class equivalent to

Java's virtual machines create a separate area in memory that is used to store string objects, a memory area called a string buffer pool. How does the Java string buffer pool work?String"abc";String"abc";StringnewString("xyz");For example, the upper

1. Java.io.File classThe file class represents system files (files and directories), and files and directories on disk are represented in Java programs by an instance of the file class.Common construction Methods: File (String pathname); File (file

[LeetCode] [Java] Rotate ImageQuestion:   You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise ). Follow up:Cocould you do this in-place?Question: A two-dimensional matrix of n x n is given to represent

Use hessian + protocol buffer + easyUI comprehensive case -- login, hessianeasyui First, we will briefly introduce hessian, protocol buffer, and easyUI framework.Hessian: Hessian is a lightweight remoting on http tool that uses the Binary RPC

Json List set, mutual conversion between entity classes, and mutual conversion between json Package com. hp. svse; import java. text. simpleDateFormat; import java. util. date; import java. util. locale; import net. sf. json. jsonConfig; import net.

In-depth understanding of the use of Spring Redis (II), RedisTemplate transaction support, serialization, redisredistemplate In the previous article, we explained the basic usage of RedisTemplate, obtained the connection through RedisCallback, and