how to practice coding in java

to IdeaIf it is much easier to add the JAVAP command to the compiler to view the bytecode file, here's how to add the JAVAP command to idea:(1) Open the Setting menu,(2) Find the Extension tool in the tool click Open,(3) Click the Green Plus button in the upper left corner of the left area to pop up an edit box like this, enter as prompted,(4) Click OK after completion, click on the setting window of apply and OK, to here has completed the JAVAP command to add,(5) View the added commands and ru

outstanding open source Concurrency Toolkit, java.util.concurrent, which contains mutex, trust, and performance-performing collection classes such as queues and hash tables, and some work queue implementations under concurrent access. The Pooledexecutor class in this package is an efficient, widely used, and correct implementation of a thread pool based on a work queue. Instead of trying to write the code yourself, it's easy to make mistakes, and you can consider using some of the tools in the

@override inside the retention set to source, compiled successfully do not have the information of these checks, on the contrary, @Deprecated inside the retention set as runtime, This means that in addition to being warned at compile time which deprecated method is used, it is possible to find out whether the method is deprecated when executed.3) @DocumentedInclude this note in the Javadoc4) @InheritedAllow subclasses to inherit annotations from parent class4.Use@Description (value= "instance u

{Private StaticString ourinstance =NULL; //Privatization Constructor PrivateTestsinleton () {}//provides static methods for external access Public StaticString getourinstance () {if(Ourinstance = =NULL){ synchronized(Testsinleton.class){ if(Ourinstance = =NULL) {ourinstance= "single-mode copy success!!!" "; System.out.print (ourinstance); } } //ourinstance= "Single case mode assignment success!!! "; //System.out.pri

Time: 32 Time: 15 3 Time: 50 Time: 57 Time: 39 Time: 21 4 Time: 47 Time: 31 Time: 39 Time: 14 Can be summarized as follows: Iterate keys and search values very inefficient, ranked almost in the penultimate or second For-each Iterative entries performance is best, but cannot remove For-each iterative keys and values are no more than For-each iterative entries performance (about Fast 10%),

Recently made a technical blog site, organized a study of the Java process to do examples and small projects, are placed on the site to provide download, there are examples of beginners, there are Java Web examples, as well as my university during the graduation design source, can be downloaded.Address: micro-Child blog-java Novice

to be met, simplicity, and performance. There is often a mutual constraint between simplicity and performance. When implementing a synchronization strategy, be sure not to blindly sacrifice simplicity for performance (which could compromise security). When using a lock, you should be aware of the functionality implemented in the code block and whether it will take a long time to execute the code block. Whether you are performing a computationally intensive operation or performing

Today finally again picked up the Java Concurrency in practice, before the abuse of the pieces, before reading this book, there is a part of their own code I did not realize that the thread is not safe, but also really want to be bad to fill this knowledge.1.Java Monitor ModeMonitor mode is very simple, is to use a private object lock or built-in lock to ensure t

Friday free to do nothing, based on an analysis of the 12306 ticketing algorithm (Java version) theory, the Java coding practice for your readers reference (the following is a brief description of the relevant code) 1. Booking tool category 1.1 The ticket information of the initialization of a train compartment /** * Generate Ticket information * * @par

dynamically invoking objects using reflection, such as a Addsaray method in the employee class, we look at how to invoke:Class C3 = Class.forName ("Employee"), Object E3 = C3.newinstance (); Field Fsaray = C3.getdeclaredfield ("Saray"); Fsaray.setaccessible (true); Fsaray.set (E3, 10000); System.out.println (Fsaray.get (E3)); Output 10000//get Methodmethod m = C3.getdeclaredmethod ("Addsaray", double.class);/* * Method m = C3.getdeclaredmethod (" Addsaray "); Method m2 = * C3.getdeclaredmethod

-h option for top is clearly stated: All thread information below this process will be printed. That is, a program that launches multiple threads, the next thread in Linux will correspond to a process!At this point, we can use Jstack to further analyze the thread's dump file:650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M00/7E/D5/wKioL1cKJhiDetsKAACWujw9FVA711.png "title=" Sogou _ 2016-04-10_17-59-49.png "alt=" Wkiol1ckjhidetskaacwujw9fva711.png "/>We can easily get the names of these t

) Instantiation (in the case of an inner class, pay particular attention to the instantiation method, which can be referenced by using new and reflection to produce an instantiated object of the Java inner Class) Sign in to map Static{Reflections Reflections =NewReflections ("Prepare");//Package name, can reduce the search scopeset for(classintIDX = Typename.lastindexof ("$");//inner class scene intIDX1 = Typename.lastindex

) { System.out.println ("---" +invokername+ "----" +adb); } } The output is:---452345234----q31234132 Articles you may be interested in: Analysis of private attribute inheritance problem in PHP class Query for private access control in PHP classes and objects public,private,protected Differences in PHP class and example analysis An analysis of PHP object-oriented public private protected access modifier is the private modifier in Java