Java

Rules for data typesChoose the right data type to store, such as to store age, his value is not more than 200 then the short storage, just waste 2 bytes so it is very economical. If the value is never greater than 100 then we will use byte to store,

Transferred from: http://book.51cto.com/art/201203/322540.htmJava uses datagramsocket on behalf of the UDP protocol Socket,datagramsocket itself is just a pier, not maintaining state, can not generate IO stream, its only role is to receive and send

PackageDE.BVB;/*** Producer Consumer model * via Wait () and notify () communication method **/ Public classTest1 { Public Static voidMain (string[] args) {Godown Godown=NewGodown (50); for(inti = 0; I ) { NewProducerthread (i * 10,

Java read the local configuration file is divided into two main categories, class-related files or sub-folders, a class of filesis a jar out-of-package configuration file.Read configuration files under Class-related folders or subfolders can use

In both sides of the communication, ServerSocket is the server side responsible for receiving, it is responsible for listening to the specified port, its constructor is as follows:1, ServerSocket () throws IOException; The parameterless constructor

1. The function of regular expressionRegular expressions, which are used to match strings, are checked for certain formats, and can be grouped by format, replacing ... In fact, no regular expression, can also be compiled. However, in most cases,

1. Adding characterspublic class Stringbufferdemo {public static void main (String args[]) {StringBuffer SBF = new StringBuffer (); Sbf.append ("H Ello World "), Fun (SBF), for (int i =0; i 　　2, append characterpublic class StringBufferDemo2 {public

1, first create a tree node class (generic Class), in order to facilitate the use of the collection of sorting methods, the generic class to implement the generic interface comparable, the code is as follows PackageCom.hjp.huffman;/*** Created by

1. Understanding WebServiceIn short, she is a remote calling technology across programming languages and operating systems. All can be developed according to well-defined specifications and interfaces, although the development language and operating

Tag: Test row represents network traffic for throw get static strBrief introduction:PORT: 11. Used to differentiate different applications.2. Port number range 0~65535, 0~1023 is reserved for the system.The 3.IP address and port number make up the

Javascript　　[1] Event① The interactive behavior that occurs when a user operates a Web page or a browser is called an event. For example: Click the button, minimize the window, modify the text box content and so on.②JS defines events in many

Highlights of bubble Sort:1. Multi-round sorting, the most important element in each round of sorting is placed at the top, and the next sort no longer uses the element;2. Using a dual for loop, the outer for loop controls the number of times to

Understanding Java-Object-oriented-properties, methodsThe manifestation of polymorphism:Upward styling, the parent class receives the sub-class object;Upward styling:A method that is unique to a subclass is not visible from the parent class

Variation of While loop when Do-while loopThe syntax is as follows:do{Loop bodyStatement (group);}while (cyclic continuation condition);If the statements in the loop need to be executed at least once, then we recommend using the Do-while loop.For

Eclipse has suddenly been loading descriptor for XXX (XXX is the project name), eclipsedescriptor Problem: After eclipse is started, I have been loading descriptor for XXX (XXX is the project name) and cannot perform any other operations. As shown

[Java daily question] 20161228, java20161228 Package Dec2016; import java. util. arrayList; import java. util. list; public class Ques1228 {public static void main (String [] arg) {Student stu01 = new Student ("001"); Student stu02 = new Student ("00

Hibernate-chapter two, hibernate-chapter Meet again !!! After learning in the previous chapter, we have some knowledge about the Hibernate framework. Next we will go to the second stage-practice! ======Prepare Database====== MySQL is used as an

Send mails in Java and send mails in java It is very easy to use Java applications to send E-mail, but first you should install JavaMail API and Java Activation Framework (JAF) on your machine ). You can download the latest Version in JavaMail

Maven configuration, maven Idea version: 2016.3 Maven: apache-maven-3.3.9 Tomcat: apache-tomcat-8.5.8 1. tomcat.apache.org download tomcat Download maven http://maven.apache.org/download.cgi Download and decompress the package in a special

Java obtains the number of days between dates. // Obtain the number of days between two datesPrivate int daysBetween (Date now, Date returnDate) {Calendar cNow = Calendar. getInstance (); Calendar cReturnDate = Calendar. getInstance (); cNow.