core java source code

In the JDK, a set of related compilation APIs can be initiated in Java to initiate the compilation process, parse the Java source file, and then obtain its syntax tree, which can be/library/java/javavirtualmachines/in the JDK's Tools.jar (OS X) Found in Jdk_version/contents/home/lib), but this is not a public API in Or

Many times you want to read the Java source code (whether it comes with a JDK or a third party), but the jar package we use is a compiled class package that cannot be opened directly in eclipse, and we need to download the source package.In this article, for example, HttpClient is a tool that Apache provides to access

, and different thread pool performers have different implementation logic.The function of Abstractexecutorservice is relatively simple, and the Submit,invokeall method of different parameters is realized.Threadpoolexecutor thread pool performer: It has a core member variable:Private final hashsetWorkers can be seen as the pool of threads used to run tasks in Threadpoolexecutor.A worker is a class that encapsulates a thread object and implements the R

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.

1.Prim algorithm Core ideaPrim algorithm is also a typical example of greedy algorithm, somewhat similar to the Dijkstra algorithm. Core idea: Divides the point into two dials, has joined the smallest spanning tree, has not joined, finds the point which is not joined the nearest set of distances, adds the point, modifies the distance from the other point to the collection, until all nodes are added to the m

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

different states in Java processes, how to get these threads into the SafePoint state, the JVM is in a different way . Interpretation of Implementation Since Java is an explanatory language, and threads need to dispatch table to log method addresses when interpreting Java bytecode, it is easier to get the thread into the stop state, as long as you replace dispat

The previous properties article has described the basic usage of the Java configuration file class properties, and when viewing the Help documentation for the JDK, there are also two methods in the Properties class LoadFromXML (InputStream) and S Toretoxml (OutputStream, String, String), the XML in the method name is not difficult to determine that the two methods are read/write data to an XML file, respectively. The JDK documentation section looks li

Java Source Code Analysis: VectorAlthough, vector collection in our programming, use less, at least I use less, in general, I tend to use the list to store some of the same type of elements.In fact, the internal implementation of the vector and the internal implementation of the ArrayList are basically consistent, the internal is through the use of arrays to achi

upload pictures, can preview, there is a progress bar, support drag-and-drop upload (Baidu Webuploader). List dynamic slide zoom display. 23.ehcache Custom Level Two cache, choose cache to store directory, handle concurrency, increase system performance 24. Server internal get POST request 25.uploadify upload plugin, single, batch upload, with progress bar, asynchronous, image, video, other file formats can be uploaded 26. Map points to obtain latitude and longitude coordinates, based on the t

the index by words. Because we usually want to store the location of the file, but rarely use the file name as the keyword to search, so we use this field to index the Java file name. The unstored field is opposite to the unindexed field. This type of field will be analyzed and indexed, but its value will not be saved to the index. Because the entire source code

In Java programming or interview often encounter = =, equals () comparison. I looked at the source code, the actual programming summary.1. = == = In Java is the address that compares two objects in the JVM. Better understand. Look at the following code:1 public class Comaddr

() will call the execution of the next interceptor in the stack.2. If the interceptor stack contains only action, invocation. Invoke () will call the action for execution. Therefore, we can find that the invocation. Invoke () method is actually the core of the entire interceptor framework. Based on this implementation mechanism, we can also get the following two very important inferences:1. If we do not use invocation. Invoke () in the Interceptor to

Recently the company to engage in shopping malls, let me consult, finally read a lot, or code, table field comments are not complete, or is a bug, or the document is missing, finally decided to develop a set of Mall.The following is the development of some experience, right vote record down, to make a record of their own.I qq:4407509, have a problem can contact mehas been engaged in e-commerce-related and Internet financial development, the processing

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

($ proxy0 extends proxy implements manager.Manager managerproxy = (manager) proxy. newproxyinstance (managerimpl. Getclass (). getclassloader (), managerimpl. getclass (). Getinterfaces (), securityhandler );Managerproxy. Modify ();}}Iii. Execution result:Do something before Method* ****** The modify () method is called.Do something after MethodIv. Mechanism Analysis:Proxy. (classloader loader, class (1) create a proxy class $ proxy Based on the getproxyclass (loader, interfaces) Call methods o

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

The Java Server supports source code for resumable upload (express and Thunder are supported) (only HTTP protocol is supported) There are many articles on the Internet about Java's support for HTTP resumable upload, but there are few articles about the support for HTTP resumable upload on the Java Server.This article

Maybe we often pay attention to the characteristics of each Set in practical applications or interviews. For example, the Set cannot store duplicate elements, and cannot maintain the insertion and size order, map sets store key-value pairs and so on. However, if you want to learn Java well or have a higher goal and be proficient in Java, it is far from enough. In fact, we still need to know more about the c

Turn from:Java ArrayList source Code anatomyGeneral IntroductionArrayList implements the List interface, which is the sequential container, where the elements hold the same data as in the order in which they are placed, allowing the elements to be placed and the null underlying to be implemented by arrays . Except that the class does not implement synchronization, the rest is roughly the same as the Vector