Java

When we read data from a file, such as Excel, because of various problems such as coding, sometimes we read the string containing some strange characters, for example? > and so on.You can use regular expressions to remove these strange characters:s =

Title:Given an absolute path for a file (Unix-style), simplify it.For example,path = "/home/" , = ="/home"path = "/a/./b/../../c/" , = ="/c"Click to show corner cases.Corner Cases: Did you consider the case where path = "/../" ?In this case, you

Very good examples of Java reflectionIn the process of learning programming, I think not only to obtain the knowledge of textbooks, but more by learning technical knowledge to improve the ability to solve problems, so that we can walk in the

JDBC Calls stored procedures: CallableStatement calls stored procedures in Java, which is quite fixed: Class.forName (...). Connection conn = Drivermanager.getconnection (..../***p is the name of the stored procedure to invoke, 4 parameters of the

I. The role of the Hashcode methodFor programming languages that contain container types, hashcode is basically involved. As in Java, the Hashcode method is primarily intended to work with hash-based collections, such as HashSet, HashMap, and

0, said in frontBefore the main study c/cpp, for some reason, intends to start from the beginning of the Java Foundation from scratch, consolidation. So, starting today to open the hole Java Learning Essays, will be in the review of the Java process

First, IntroductionReference types in Java are made up of four cases, strong references, soft references, weak references, and virtual references.　　　　                                                                                                    

Title:Given a list, rotate the list to the right by K-places, where K is non-negative.For example:Given 1->2->3->4->5->NULL and k = 2 ,Return 4->5->1->2->3->NULL .Test Instructions:Given a list of nodes with a distance of k points from the right

1 , setting set hashcode set think that the object does not exist in the collection, add it directly. Suppose an object exists at that location. The objects that are ready to be added to the collection are then equals false true 2 ,

It is often found that this type of problem is mainly caused by the return of the data conversion problem, in general do not refer directly to the way the WSDL (if called. NET development WebService can), with HttpWebRequest Way to obtain the

. TCP ProgrammingThe development of TCP programs using sockets (Sockets) in Java makes it easy to establish reliable, bidirectional, continuous, point-to-point communication connections.In the socket program development, the server side uses

Title:Follow up for "Unique Paths":Now consider if some obstacles is added to the grids. How many unique paths would there be?An obstacle and empty space are marked as and respectively in the 1 0 grid.For example,There is one obstacle in the middle

Java database tools and java database tools Previously, I used to write a project using a framework and encapsulated entities very conveniently. This time I wrote it directly using servlet and jsp, encapsulated data myself, a lot of repeated code,

Summary of Chinese Struts garbled characters In the process of struts development, there are always many garbled issues, but in the final analysis, there are only three situations:(I) Chinese garbled characters are displayed on the page.(Ii) Chinese

Use Camel Routes in Java EE components[Editor's note] Markus Eisele, Developer Advocate of Red Hat, is mainly engaged in JBoss Middleware research and has more than 14 years of Java EE experience. In this blog, Markus mainly shares the Camel Routes

Java callback function mechanism  Java callback function mechanism   I have referenced some online materials and made some summary below for beginners to learn.   I. Overview   There are always some interfaces between software modules. In terms of

Java Nio feature learning (1)Java NIO feature learning Java NIO contains several core components:ChannelsBufferSelectorsChannels It can be understood as a stream of resources. The stream resource can read Data from the Channel to a Buffer or

Java learning and java0. above I used to learn C/CPP before. For some reason, I plan to repeat the basics of Java from the beginning to consolidate it. As a result, I started to learn Java from today. I will write some of my experiences during the

Appfuse: add custom page components and appfuse custom I used to do ASP. NET, after encountering similar components used by multiple pages, I want to use ascx (user-defined components) to solve the problem. I also want to use this solution for Java.

Java heavy load, rewriting, polymorphism, static binding, dynamic binding   Overload. The English name is overload, which defines more than one method with the same name in a class. The number, type, and sequence of parameters of these methods