Java

Method One: Most people use a method, intuitive, convenient, but inefficient.1:if (s = = NULL | | s.equals (""));Method Two: Compare string length, high efficiency, is the best I know of a method.2:if (s = = NULL | | s.length () Method Three: Java

is to write a small program, used for recording, convenient follow-up review, first thanks to the following this blog, from this article derived from it, we can learn:Http://www.cnblogs.com/lichenwei/p/4610298.htmlRead this article, feel very

The less mutable states, the easier it is to ensure thread safety.Try to declare the domain as the final type.Immutable objects must be thread-safe and can reduce the complexity of concurrent programming, make it easier and secure to share

云智慧（北京）科技有限公司 陈鑫Restart thread poolTaskManagerpublic class TaskManager implements Runnable {.....Public TaskManager (setrunners) {Super ();This.runners = runners;Executetasks (runners);}Private Voidexecutetasks (set runners) {for (Filetask

Spring1) Open source framework2) IoC (control inversion), writes the creation and dependency of the class in the configuration file, is injected by the configuration file, realizes the loose coupling3) AOP will be safe, the transaction is equal to

/*** Compare two specified time, the result is 0 means the same,@paramFirstDay *@paramSecondday *@return */ Public Static intCompareTo (String firstday,string secondday) {Calendar C=calendar.getinstance (); Calendar C2=calendar.getinstance ()

1. What is a Lsit collection?A list collection is an ordered, repeatable collection of elements in which each element has its own element index. The list collection allows repeatable elements that can be indexed to access the elements at the

Import Java.util.regex.matcher;import Java.util.regex.Pattern; Public classregexmatches{ Public Static void Main(String args[]) {//In string lookup by specified modeString line ="This order is placed for qt3000! Ok? "; String pattern ="(. *) (\\d+) (

Example:Defining a generic StorePackage Javabased;public interface Store {}Two implementation Classes Stringstore,integerstorePackage Javabased;public class Integerstore implements store {}Package Javabased;public class Stringstore implements store {

Location coordinates through addresses Casual writing for fun Public class getXYByAliyunAPI {public static void main (String [] args) {Connection conn = null; FileOutputStream FD = null; try {conn = JDBCUtil. getConnection (); PreparedStatement pstm

Java multithreading and java multithreading instances Java multi-thread programming (1) inherit the Thread class to implement Multithreading Sample Code: Package com. example. thread; public class MyThread {/*** @ param args */public static void

Java set sorting 1. Define sorting Class ComparatorDefault implements Comparator {public int compare (Object arg0, Object arg1) {OrderDetailReturn. bidsEntity bid0 = (OrderDetailReturn. bidsEntity) arg0; OrderDetailReturn. bidsEntity bid1 =

A simple example of Java-ReentrantReadWriteLock Content: shared during lock reading and mutex (visible running results) During lock writing are implemented through AQS.   Public class ReentrantReadWriteLockTest {static class MyObject {private Object

Change the logback configuration file path in the java web project My small Website: http://51kxd.com/welcome to visit when you are not happy, adjust the mood   Configuration in web. xml:   LogbackConfigLocation

Spring references beans in different xml To reference the bean defined in the Spring-Common.xml in the Spring-Output.xml, you need to use Label. If it is referenced in the same xml file, use Label. package com.spring.output;public class

HTTP Protocol Introduction I. HTTP protocol: HTTP is short for hypertext transfer protocol (hypertext transfer protocol). It is an application layer protocol of TCP/IP protocol, used to define the process of data exchange between WEB browsers and

Four traversal methods of the Map set and four map sets Compare the code written a long time ago with the previous one! Easy to view later 1 import java. util. hashMap; 2 import java. util. iterator; 3 import java. util. map; 4 5 public class

Spring technology Insider: Implementation Principles of Spring AOP (V) 7. Implementation of Advice notificationsWhen the AopProxy proxy object is generated, its interceptor is also generated. Next we will analyze how Aop enhances the target object.

Java socket Communication-Transfer File images-transfer imagesClientTcpSend. java client sending classPackage com. yjf. test;Import java. io. DataOutputStream;Import java. io. File;Import java. io. FileInputStream;Import java.net.

Java basics: non-blocking IO (NIO)    Introduction   NIO (New IO) is introduced in JDK1.4 to improve the IO speed. Note that JavaNIO is not fully non-Blocking IO (No-Blocking IO), because some channels (such as FileChannel) can only run in Blocking