sorting techniques in java

special needs of converting XML to JavaBean, an Apache-named Digester tool gives us a choice. Since XML is eventually converted to JavaBean stored in memory, the analytic performance is not really much related to the user. The key to parsing is to match the pattern of XML and rules, etc., because the tool is more complex, confined to space, the author can only give a simple introduction.Here is an example fragment of Digester parsing XML:Listing 4. Digester parsing XMLDefine the path to the XML

After being immersed in coding for a while (for example, I've been in the program for almost 20 years or so), you'll be getting used to these things all the time. Because, you know ...Anything can go wrong, yes, it does.That's why we use defensive programming, which is the reason for some paranoid habits. Here are some of the 10 most useful but paranoid Java programming techniques I personally consider. Let

message only indicates that the argument is illegal or incorrect, but the second message includes the parameter name and the illegal value, which is important for finding the cause of the error. Always follow this Java best practice when writing exception handling code in Java programming. 5 Avoid excessive use of check-type exceptions Check-type exceptions have some advantage in enforcement, but at the

The performance of the program is directly affected by the quality of the code. In this article, I'll focus on some code-writing tips and conventions that can help you improve system performance at the code level.1, cautious use of abnormal In Java software development, Try-catch are often used for error trapping, but Try-catch statements are very bad for system performance. While it is not possible to detect the loss of performance in a single try-ca

　About the performance optimization of Java code, every Javaer is eager to master the ability, and then promoted to Daniel's path, but the Java tuning needs to understand the entire Java operating mechanism and the underlying call details, need to read more reading more than try to write more, not overnight work. This article is a recent author to the company's s

After indulging in coding for a while (say I've been on the program for almost 20 years), you're getting used to these things. Because, you know ... Anything can go wrong, yes, it does. That's why we're using defensive programming, the reason for some paranoid habits. Here are 10 of the most useful but paranoid Java programming techniques I personally think of. Let's take a look: 1. Put a string string in

when creating PreparedStatementPreparedstatemet PS = cn.preparestatement (sql,resultset.type_scroll_insensitive,resultset.concur_read_only);Resultset.absolute (9000);Batch Update1, StatementStatement sm = cn.createstatement ();Sm.addbatch (SQL1);Sm.addbatch (SQL2);...Sm.executebatch ()A statement object that can execute multiple SQL statements after a batch update. The multiple statements can be delete, update, Inssert, etc., or both2, PreparedStatementPreparedStatement PS = cn.preparedstatemen

include many levels, such as error errors, warning warn, information info, etc., and have open source projects dedicated to logging, such as log4j to complete log management.5, the server side of the small Java program English is: Server Applet, so we put the server side of the small Java program called: Servlet.6, the use of Java code for simple Web server deve

Java performance optimization techniques and actual combat　About the performance optimization of Java code, every Javaer is eager to master the ability, and then promoted to Daniel's path, but the Java tuning needs to understand the entire Java operating mechanism and the un

lose a bet to write code, look at the following example:Bad, doesn ' t compileswitch (value) {case 1:int j = 1; Case 2:int j = 2; break;} Goodswitch (value) {case 1: { final int j = 1; break; } Case 2: { final int j = 2; break; } Remember: Default: throw new Threaddeath ("that ' ll teach them");}In a switch statement, each CASE statement has a range of only one line of statements, in fact, these case statements are not even real statem

Java's symmetric encryption techniques Symmetric Encryption uses a single key to encrypt and decrypt a message . This type ofencryption is classified as either stream ciphers or block ciphers. More details on thesealgorithms can be found Athttps://en.wikipedia.org/ Wiki/symmetric-key_algorithm symmetric algorithms that is supported by Java include the following ones where The keysize in bits are enclo

1. Determine if there is a exists keyword or "??" Operator. will return a Boolean valueUser.name?existsUser.Name?? if user.name?exists> //TO DO if > if user.age??> //TO DO if > 　　 2. Ignore null valuesHypothetical premise: User.Name is null${user.name}, exception${user.name!}, display blank${user.name! ' Vakin '}, if User.Name is not empty, displays the value itself, otherwise Vakin${user.name?default (' Vakin ')}, Ibid.${user.name??? String (User.Name, ' Vaki

Java Concurrent---threadlocal class and application techniques The previous section summarizes the thread-wide data-sharing problem, which defines a map, saves the current thread name and data in the thread to the map in the form of a key-value pair, and then gets the data from the current thread from the map based on the current thread name when using the data in the current thread. This allows the data t

Http://www.androidren.com/index.php?qa=282qa_1=android JS calls Java code or uses JavaScript-related techniques to change how to confuseAndroid 4.2 Start JS call Java code must add @JavascriptInterface to call. Add @JavascriptInterface after you have to consider the confusion of the time of the problem, if confused when the @JavascriptInterface lost your program