core java source code

they are converted and so on.The Obserable interface and the Observer class in the Java.util package are the core of the explorer pattern.......3. Java IOThe book on the market for IO is only two copies of OReilly publishing house, both of which are Elliotte Rusty Harold's writings. The style of the two books is basically the same, recommended reading is the first version of the "Jvava I/o", speak relative

Java Open source Fresh e-commerce platform-order Form design (source code can be downloaded)Scenario Analysis Description:The buyer (restaurant) user, through the app to choose the dish, puts in the shopping cart, then orders, the final payment process, we call the order process.Buyers can buy eggplant at Zhang San Hom

Java Open source Fresh e-commerce platform-search module design and architecture (source code can be downloaded)Description: The search module is aimed at the buyer's users, looking for food products to find a very strenuous query. Currently, it is also a fast search product.For mobile app buyer users, the required spe

problem: Java uses shortcut keys to view source code display sources not foundCause of the problem: The missing src.zip file in the JDK directory is only javafx-src.zipsrc.zip File: Source code for all Java classes download Src.zi

from Destpos to Destpos+length-1. Because it is a native method, it is not visible in the JDK, but you can view the source code in the OPENJDK. The function actually eventually calls the C language's memmove () function, so it can guarantee the correct copying and movement of elements within the same array, which is much more efficient than the general method of replication, and is well suited for batch pr

operation 16 . Database restore : Historical backup record, restore database or single table, statistics backup time and file size 17 . SQL Editor: Powerful SQL Editor, support edit Statement complex query statement, generate dynamic report, can export Excel 18 . Access records: Log each IP access time, source region, network operator, count the number of visits per IP and verbose time 19 . IP blacklist: Blocked IP blocked access to Web site

Java Open source Fresh e-commerce platform-system architecture and technology selection (source code can be downloaded)1. Hardware environmentCompany servers2. Software Environment 2.1 operating systemLinux CentOS 6.8 Series2.2 Reverse Proxy/web ServerNginx2.3 Application Serverjdk7+ Tomcat 72.4 DatabaseMysql 5.6.x2.5

. Loadfractor plays the role of a flag bit, which marks the beginning and end of the calculation. About the H + + Entry.hashcode () in the H will overflow problem, above the hash () function has seen each time the hash will be with the 0x7fffffff, that is, the hash is always positive, will not overflowSerialization and deserializationprivate void WriteObject (Java.io.ObjectOutputStream s) throws IOException {entryNote that during deserialization, it does not recreate a hashtable that is exactly

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

original array, whether it is from the time complexity O (n) or the space complexity s (n), the efficiency and performance are all underneath, and compared to its super-fast query and modification, it simply can't bear to look directly. The core code for its expansion is posted below.private void Grow (int mincapacity) {//overflow-conscious codeint oldcapacity = elementdata.length;int newcapacity = oldCa P

use the list to solve (here is a single-linked list, not like the LinkedList using a double-linked list), but also according to the conflict evolved to a certain scale, A self-balancing binary tree is used to replace the linked list for better performance, from time complexity O (n) to O (Logn). Here too many source code is not good to say, or the old saying, self-viewing

successfully. If the Java command does not execute successfully, add an entry in path (add a new item after the value of the previous path), as follows: D:/program files/java/jdk1.6.0_17 If the Javac command does not execute successfully, add another entry in path, as follows: D:/program Files/java/jdk1.6.0_17/bin The

Brief IntroductionJava.exe is the execution program of the Java classfile. An execution shell that loads JVM. dll (in windows, the following uses Windows as an example, Linux and Solaris are actually similar, for: libjvm. So), this dynamic Connection Library is Java The actual operation of the virtual machine. This document describes how the java. exe program fin

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

This article is based on the source code Scenario Analysis of the Android system, by Luo shengyang I. Architecture code: ~ /Android/frameworks/base/core/java/android/OS ---- IInterface. java (Interface) ---- IServiceManager.

Java Collection series [3] ---- HashMap source code analysis, java ---- hashmap We have analyzed the ArrayList and ArrayList sets. We know that ArrayList is implemented based on arrays, and ArrayList is implemented based on linked lists. They each have their own advantages and disadvantages. For example, ArrayList is s

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