Java

In order to write a Java collection program, from the online learning to 3 ways to get a single page content method, mainly to the Java IO Stream knowledge, not familiar with it, so write a summary. Import Java.io.bufferedreader;import

Transferred from: http://www.cnblogs.com/zhuocheng/archive/2011/12/12/2285290.html———————————————————————————————————————————— I. Get information entered by console user      public String getinputmessage () throws IOException ... {

The interface chapter talks about abstract class and interface, the abstract class feeling is very abstract in simple reading. And the interface of this chapter of the knowledge point, and did not like before the detailed, but also broken and

In the project development, may encounter Java multithreading, in order to ensure the normal business data, must be coupled with the lock mechanism, commonly used to deal with synchronized keyword, the current JDK version of synchronized has done a

Package com.*;p Ublic class RC4 {public static string DECRY_RC4 (byte[] data, string key) {if (data = = NULL | | key = NULL) {return null;} Return asstring (rc4base (data, key));} public static string DECRY_RC4 (string data, string key) {if (data = =

Java Concurrency Programming: Concurrenthashmap of Concurrent Containers (reprint)The following part of the content is reproduced from:http://www.haogongju.net/art/2350374New concurrent packages have been added to the JDK5, and concurrent containers

The JDK itself has a lot of monitoring tools, such as Jconsole.The tool we are going to talk about today is VISUALVM, which is one of them. But this tool is only in JDK1.6.07 and above. It is a good free monitoring tool to monitor the JVM heap,

Volatile allows variables to be taken from main memory each time they are used. Instead of "working memory" from each thread.Volatile has the "visibility" of the synchronized keyword, but there is no "concurrency correctness" of the synchronized

Http://www.cnblogs.com/xiaoMzjm/p/3899366.htmlBackgroundIn the previous post Java Crawl Web page content Simple example (1)-using regular expressions inside, describes how to use regular expressions to parse the content of the Web page, although the

********************************************You call the function equals on the array, comparing the addresses of C and CHChange intoif (Arrays.equals (ch,c));We can compare the contents of C and ch.Java.sun.com said,In addition, there are problems

[Java]View Plaincopy Import Java.io.File; Import Java.io.FileOutputStream; Import de.innosystec.unrar.Archive; Import De.innosystec.unrar.rarfile.FileHeader; Public class Unrartools { public void Unrar

Implementation principle:Use Httpconnection.setrequestproperty ("RANGE", "bytes= xxx-xxx") to get the specified data blockUse Randomaccessfile to implement random access to the file, write the specified data block to the file.Key issue: Get the

Encapsulated, the product hides the internal details and is provided only to the user interface (interface).Interfaces are very useful concepts that can assist in our abstract thinking. In real life, when we think of an appliance, we often think of

Health, home? [Analysis of Java Memory]Abstract: Original creation Place: http://www.cnblogs.com/Alandre/sediment brick slurry Carpenter hope reprint, keep abstract, thank you!optimism, how can and other kno u,u R yourself! I must is strong and

An array of objects, which is easily understood as: the elements in the array are all objects. but this understanding is wrong , the array is not the object itself, but the object's reference, that is, the pointer to the object, and this pointer is

Java object creation process addendum, java object Addendum 1. static modified items belong to this class and are shared by all instances of this class. Therefore, their initialization is prior to the initialization of instance objects. 2. There is

Mina, Netty, and Twisted: Integrating protobuf and nettyprotobuf Protobuf is short for Google's Protocol Buffers. It is used for the conversion (serialization and deserialization) between structured data and bytecode. It is generally used for

Startup of Java Virtual Machine and program running This article is from the perspective of OpenJDK source code. java -classpath . hello Later, how does java.exe execute from the main function, start the virtual machine, and execute the code in the

Java. util. concurrent package source code reading 15 thread pool series ScheduledThreadPoolExecutor part 2, threadpoolexecutor This article focuses on DelayedWorkQueue. In ScheduledThreadPoolExecutor, DelayedWorkQueue is used to store the tasks to

Recursive and non-recursive analysis of quick sortingZookeeper 1. algorithm ideasQuick sorting is A sort by Division and exchange proposed by C. R. A. Hoare in 1962. It adopts a sub-Governance Policy, usually called Divide-and-ConquerMethod ).(1)