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Original address: http://www.zhihu.com/question/34345694
Why does Java source go through the intermediate steps into bytecode, which is not to increase the workload. Directly interpret the source code across platforms as well.
Why not explain the source
26. Map points to obtain latitude and longitude coordinates, based on the two latitude and longitude calculation distance27.tab label page function, tag free switch, not duplicate operation database28. In-Station letter voice alert, JS control audio playback29. Baidu Rich Text editor, can upload pictures30. Web crawler technology, can be based on the Web site to crawl pictures and page titles and other information (crawl a store image to save the server)get "" qq:313596790 "Free support Updates"
expansion of the original twice times.Iteratorsprivate abstract class HashIteratorIn fact, the implementation of the iterator in the collection implementation of the class are similar, as long as you see one on it. This also records the number of changes expectedmodcount, that is, after the iterator is created, it is not possible to iterate during the modecount++ such operations, or appear fail-fastSerialization and deserialization-saving and reading the state of HashMapprivate void WriteObject
memory, will not cause fragmentation.Selection of arrays and linked listsFrom the above analysis, the difference between the array and the linked list affects us the most:
The array is quickly found by location, and the linked list is easy to delete
Arrays are fixed size and linked lists can be expanded and scaled down at any time
Linked list each element occupies slightly more memory than the array
Arrays and linked lists are generally more common in queries, and take a lo
the data on the server. The specific process is as follows:
Client requests a protected resource for the server
The server sends a request to the client to request username and password.
Client sends user name and password to server
The server returns the appropriate data to the client
This authentication method is not secure, the client sends the user name and password is Base64 form encrypted text, this situation of the user name and password is exposed, if someone c
In the previous article, detailed description of the source code of HashMap and HashSet, from the point of view of the source can be seen in the depth of the relationship between the two, speculation, Linkedhashmap and Linkedhashset must also have in-depth contact. After analysis you will find that the relationship between the two is the same as HashMap and HashS
Briefly1. Mac OS (version 10.8) comes with jdk1.6 or JAVA6, but no source code. Mac OS comes with Java 6 which is released and updated by Apple, slightly different from Oracle's Java 6, such as No Rt.jar, instead of Classes.jar other details for reference http://my.oschina.net/hmj/ blog/799392. Oracle officially does n
obfuscation jscompressor
Jscompressor, mainly used to compress, confuse JS (Javascript) and CSS, based on Yui compressor, the purpose is to facilitate unfamiliar Java or do not like the command line compression of Web developers to use. Functions: 1, can compress, confuse the entire directory (including subdirectories) under the JS or CSS files, in the same folder to generate *.min.js or *.m ... More jscompressor Information
Last
The difference between the source code, the reverse code, and the supplementary code in Java >>>> and the reverse code.
When I analyzed the HashMap hash algorithm two days ago, I met the >>and >> symbols. At that time, I checked t
The problem is: the path to the keyboard input file, find content, and replace content to find and replace the contents of the file for the specified path. ”
Long time no write interface, today familiar with the interface of the writing and listener operation.
The problem is not very difficult in itself, and the focus should be on the handling of various possible errors during file processing. So write code needs to be very careful, and the error is h
For example, to count the workload of a Java programmer writing code in one day (for example, the number of lines of valid code, the number of blank lines, and the number of lines of comments), this tool may serve as a reference.
Idea: because the content of each Java source
new Java project or a Java Dynamic Web project.2. Delete the SRC directory under the new test project in the first step.3, right-click the project "Properties, search Java build path, select Java build Path," Select the Source tab, "click Add Folder. Button.4. Pop up the
class Beaninfoannotationprocessor extends Abstractprocessor
8.3) Compile the annotation processor and run
Compile note Processor: E:\bench-cluster\cloud-data-preprocess\corejavaadvanced\src>javac com/corejava/chapter10_6/ Beaninfoannotationprocessor.java
Run: E:\bench-cluster\cloud-data-preprocess\corejavaadvanced\src>javac- Processor Com.corejava.chapter10_6.BeanInfoAnnotationProcessor Com/corejava/chapter10_6/chartbean.java
Result: You can then view the automatically generated Chartbeanbea
I think there are three core points in the source code reading: technical foundation + strong curiosity + patience.
Speaking of the technical foundation, let me give you an example. If you have never learned Java or any programming language such as C ++, you should start with core Java. it is very difficult for you to
Portal-Basic Java Web Application Development Framework (portal-basic for short) is a fully functional, high-performance full-stack web application development framework, built-in stable and efficient MVC infrastructure and Dao framework (with built-in support for hibernate, mybatis, and JDBC ), integrates basic web application components such as Action interception, form bean/Dao bean/spring bean assembly, internationalization, file upload/download,
client takes advantage of the flag field implementation to convert the data byte array into the type required by the application layer).In other words: the memcached cache system provides the server-side implementation (C language) and contracts the message format that the client communicates with the servers, more precisely the byte-stream format (communicating over TCP). Different language clients are just implementations of this specification. Of course memcached has provided client implemen
Source code of Java-based typing exercises and java-based typing exercises
The Code is as follows:
Import java. applet. applet; import java. applet. audioClip; import
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