Java

Lao Li share: LoadRunner Java User script developmentPoptest in the performance Test LoadRunner course, the main web protocol, but also the other protocol script development, for a performance test engineer need to master more than one protocol,

File pathFile File = new file (path);Gets the file name.String filename = File.getname ();Download the file in the form of a stream.InputStream fis = new Bufferedinputstream (new FileInputStream (path));byte[] buffer = new byte[fis.available ()];Fis.

Decimal conversion to 16, eight, binary without write algorithm directly withString hexstring = integer.tohexstring (int= integer.toocalstring (int= integer.tobinarystring (int decnum);The N-ary Nstr is converted to decimal, and can be used with

First, the class loading mechanism in Java has the following three properties:1. Overall responsibility System"Overall responsibility" means that when a classloader loads a class, the class that is dependent on and referenced by the class is also

ServerSocket has the following 3 options.So_timeout: Represents the time-out period waiting for a client connection.SO_REUSEADDR: Indicates whether to allow reuse of addresses that are bound by the server.SO_RCVBUF: Represents the size of the buffer

1. Static methodsIn general, defining a method in a class is static, which means that you do not need an object of this class to call this methodThe method declared as static has the following limitations:• They can only invoke other static methods.•

? once the synchronized adornment is added to the method of the object, only one thread can access the synchronized decorated method at any time. Suppose that a data object has a write method and a read method, in order to ensure the security of

Multithreading as a very important point of knowledge in Java, there is still a need to summarize.I. Thread life cycle and five basic statesFor the life cycle of the threads in Java, first look at this more classic diagram:Basically includes all the

Reprint: http://eclipsesource.com/blogs/2014/04/11/3-good-reasons-to-avoid-arrays-in-java-interfaces/If you find that the use of an interface has the following definition method:Public string[] GetParameters ();Then you should seriously reflect on

To put it simply, the observer pattern defines a one-to-many dependency that allows one or more observer objects to monitor a subject object. Such a change in state of a Subject object informs all those observer objects that depend on this object,

Reprinted from: http://www.cnblogs.com/dolphin0520/p/3811437.htmlAbstract is one of the most important features of object-oriented programming. In Java, there are two ways to embody the abstraction of OOP: interfaces and abstract classes. There are

Sort-bubble sortBasic idea: start at one end, compare the adjacent two elements, and find that the reverse is exchange. Here, you'll compare adjacent elements one by one, from backward forward (top to bottom).Average Time: O (N2)Best case: O

ObjectiveHttp://www.cnblogs.com/xrq730/p/4839245.html,HotSpot uses the Interpreter + compiler co-existence of the architecture, the previous article has been mentioned, this article just put the real-time compiler this piece to speak more specific.

1. Overview of the HashSet class:(1) No guarantee of Set iteration order(2) In particular, it does not guarantee that the order is constant2. How HashSet guarantees element uniqueness(1) The underlying data structure is a hash table (an array of

Traversal of the 1.Collection collectionThe collection collection is not directly traversed, so we have to be able to traverse it indirectly, we know the array is easy to implement the variable, we can do this:Use object[] ToArray (): Converts a set

Protected class LoadClass (String name, Boolean resolve) throws classnotfoundexception{//plus lock, synchronous processing because it can be Can be multithreaded in the Load class synchronized (Getclassloadinglock (name)) {//check if the class has

Write it over again and forget it!The fastest platoon1 Public classFastsort {2 Public Static voidMain (string[] args)throwsexception{3 int[] A = {10, 1, 2, 3, 7, 3, 8, 5, 6, 4};4Fastsort B1 =NewFastsort ();5B1.sort (a,0,a.length-1);6

1. Exception Precautions:(1) When a subclass overrides a parent class method, the child class's method must throw the same exception or subclass of the parent exception . (father is broken, son can not be worse than father)(2) If the parent throws

First, the operating mechanismThe Java source program is compiled by the compiler into platform-independent bytecode, the bytecode is interpreted by the virtual machine, the virtual machine sends each byte code to be executed to a specific platform

JDK source code reading-Java Memory Model0. Why the Java memory model is required?In order for programmers to ignore the memory access differences between various hardware and operating systems, there is no need to worry about the differences