java code snippets for practice

[Practical Java high concurrency programming design 4] Arrays can also be unlocked: AtomicIntegerArray, java concurrent programming practice pdf In addition to providing basic data types, JDK also prepares arrays and other composite structures for us. The available atomic arrays include AtomicIntegerArray, AtomicLongArray, and AtomicReferenceArray, which respecti

) {System.out.println ("Less than 3 parameters");return; The String result =""; for(String S:args) {result + = s +" "; } System.out.println ("Parameters:"+ result); }}/** * Output: * parameter: Caroline Wendy girl *///:~11//:allthecolorsoftherainbow/** * Coded style test * Created by C.l.wang on 15/7/6. * * Public class rainbowtest { Public Static void Main(string[] args) {Allthecoloroftherainbow ATC =NewAllthecoloroftherainbow (); Atc.changethehusofthecolor ( -); System.out.println ("Thehu

[Java concurrent programming practice] -- synchronized, asynchronous ynchronized In our practical application, we may often encounter such a scenario: multiple threads read or write the same data, access the same file, and so on. If we do not control this situation, it is very easy to cause errors. In java, the concept of critical section is introduced to solve t

Compiling efficient C Programs and C code optimization based on the Program Design cornerstone and Practice Series Although there are many effective guidelines for optimizing C code, it is still irreplaceable for thoroughly understanding the compiler and the machine you work on. Generally, speeding up the program will increase the amount of

(collection 1 // a collection of Integers2 Collection c = new HashSet();3 // a collection of Objects4 Collection r = new HashSet();5 c.removeAll(r); If the preceding snippets are generalized in an intuitive way (set C to collection Classes designed before generics may impede the "obvious" generic method. In this case, it is necessary to make a compromise like the previous example. However, if a new generic class is designed from the beginning, it m

Java 9 is faster: JShell hands-on practice HowIs it one of the coolest features of Java 9? Last week, I finally took the time to experience a preemptive version of Java 9. The first stop is JShell, which is also called the Kulla project. This is why at first I had the courage to try

accordance with Eclipse specification indentation.A very important part of the code standard is how to name packages, classes, variables, methods, and so on, so that you can name your code to go up a notch immediately. The general naming conventions in Java are: To embody their own meanings. Terms for packages, classes, variables Method name wit

, it is more efficient than the normal array transfer, but because the construction/destruction/maintenance of the shared memory cost is relatively large, so the small data of the array is recommended to use the same method, Direct The buffer mode is more suitable for long-term sharing of large chunks of memory with frequent access. The specific use method is described as follows:First look at the definition of Native.java:and see how native.c is implemented:As can be seen from the above

way, the language forces us to document all the expected ways in which we can exit a method. ??For exceptions caused by programming errors, or exceptions that cannot be expected to be caught by the program (dereference a null pointer, array out of bounds, except 0, and so on), some exceptions are named unchecked exceptions (that is, those inherited from RuntimeException Exception) and does not need to be declared. ?? The traditional view ?? The following excerpt from Sun's "The

Original source: http://www.ibm.com/developerworks/cn/java/j-jtp06197.htmlGuidelines for using volatile variablesThe Java™ language contains two intrinsic synchronization mechanisms: synchronous blocks (or methods) and volatile variables. Both of these mechanisms are proposed to achieve the security of code threads. Where volatile variables are less synchronous (

capture or Specify runtime exceptions, writing code that throws only runtime exceptions or makes all of their exception subclasses inherit from RuntimeException, it is attractive for programmers. These programming shortcuts allow programmers to write Java code without being disturbed by all picky errors from the compiler and without specifying or capturing any e

main code as follows:Code 3public class Executorgroup {Executor[] group = new Executor[NUM];Thread boss = null;MapAtomicinteger cursor = new Atomicinteger ();volatile int cursor = 0;Public Executorgroup (String name) {//init Group for (int i = 0; i Registeredtables.put (Taskkey, Cursor.getandincrement ());Registeredtables.put (Taskkey, cursor++% NUM);}int index = Registeredtables.get (Taskkey);Logger.debug ("execute message {}, register index {}", Ta

Need to support polling, timed locks. A lock is required for an interruptible lock fetch operation. You want to use a lock in a non-block structure. Learn about an explicit lock that supports more advanced operations. Java 5.0 New Reentrantlock is not an alternative to built-in locking, but an optional advanced feature when the built-in locking mechanism does not apply. 13.1 Lock and Reentrantlock The Reentrantlock implements the lock interface, provi

[Spring practice series] (15) use Spring Java-based configurationNot all developers like to use XML, so Spring3.0 has prepared something special for these developers. You can use pure Java code to configure Spring applications without using XML. Java-based configuration has

13.3% Design 2h 26.6% Code implementation 4h 53.3% Test 0 0 Analysis Summary 30min 6.7% Experimental Summary (no pairing game programming)The most practical knowledge learned through this experiment is the use of refactoring Raname: How to modify a name. It is an improvement in eclipse, and is now quick and easy to modify, when the name

Friends who are just concerned, can review the first two articles: Basic application Development Distributed Application Development The last article summarizes the second part of "in-depth practice spring Boot", which summarizes the third and final part of this article. This part mainly explains the core technology source code analysis, because the length and the ability reason, the analy

Address: http://blog.csdn.net/kongxx/article/details/7319410 One of Java Socket practices: Single-thread Communication Java Socket practice 2 multi-thread Communication Java Socket 3 transmission object Java Socket practice