java code analysis tools

reach more than 60,000 times, that is, the entire list will be scanned, the blame will be so slow.The original list is then replaced with the set:setSpeed on the go up, in the weight of this piece up to spend a second, why HashSet speed went up, that is because its internal use is Hashtable, this is HashSet contains source:Public Boolean contains (Object o) { return Map.containskey (o); About Unsupportedoperationexception ExceptionsA java.lang.UnsupportedOperationException exception occurr

(); FileChannel Filewritechannel = Fileoutputstream.getchannel (); Bytebuffer buffer = bytebuffer.allocate (1024x768); buffer.clear (); int len = 0;while ((len=filereadchannel.read (buffer))!=- 1) {buffer.flip (); filewritechannel.write (buffer); Buffer.clear ();} Filereadchannel.close (); Filewritechannel.close ();} public static void operfilemapped (String file) throws Exception{randomaccessfile RAF = new Randomaccessfile (file, "RW"); FileChannel FC = Raf.getchannel (); Mappedbytebuffer MBB

Recently, the time to take the Java Arrays Tool class Aslist method to do the source code analysis, the online collation of relevant information, recorded down, hope can also help readers! The Arrays tool class provides a method Aslist, using this method You can convert a variable-length parameter or array into a list. The source

http://heylinux.com/archives/1085.html using thread dump analysis to find Java code with high CPU consumption and memory overflowFirst of all, I want to thank my good friend Zhao to share the experience of the flower.I believe that in the actual work, you will certainly encounter high CPU consumption and memory overflow caused by the code.Usually when this happen

The java. util package contains a series of important collection classes. This article will start with analyzing the source code, thoroughly studying the internal structure of a collection class, and traversing the source code implementation of the iteration mode of the set. Next, we will briefly discuss a root interface Collection, and then analyze a abstract cl

Source code analysis of ORM framework: Introduction: Java JDBC, ormframework If you have found an ORM definition on Baidu Encyclopedia: Object relationship ing (English: Object Relational Mapping, ORM for short, or O/RM, or O/R mapping ), it is a program technology used to convert data of different types of systems in object-oriented programming languages. In eff

Source code analysis of the collections list of Java Collection SeriesI. Introduction to tranquility list A sort list is an ordered sequence that allows efficient insert and remove operations at any location. It is implemented based on a two-way linked list. Ps: Here is a question about whether or not the data structure of the sorted list is a circular two-way li

Java Source Code Analysis: In-depth discussion of iterator modeBrother LianThe Java.util package contains a series of important collection classes. This article will start from the analysis of source code, in-depth study of the internal structure of a collection class, as we

Java concurrency series [2] ---- exclusive mode of AbstractQueuedSynchronizer source code analysis, In the previous article "Java concurrency series [1] ---- brief analysis of AbstractQueuedSynchronizer source code

Today, while looking at the source code of LinkedList, I met a hole. I study the source, found LinkedList is a straight line of the linked list structure, but I search data in Baidu, about this part of the source code analysis, all said LinkedList is a ring-linked list structure. I struggled for a long time, I think I understand the wrong, and finally found the r

a third-party implementation, it is similar to a table data structure, each call to next ( It points to the next database record, calling different GetXXX (String columnName) for different types of fields to get the value of the corresponding field for that record. In addition to these primary interfaces, JDBC provides a DatabaseMetaData interface that describes database properties and some type classes such as Date and exception classes. From the above ana