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way. Public classSingleton {Private Static classSingletonholder {Private Static FinalSingleton INSTANCE =NewSingleton (); } PrivateSingleton () {} Public Static FinalSingleton getinstance () {returnsingletonholder.instance; } } This notation still uses the JVM itself to ensure thread safety, because Singletonholder is private, there is no way to access it except for getinstance (), so it is lazy, it is not synchronized when the instance is read, there is no performance flaw; JDK version.

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The path to agriculture: five things I should have done Over the past few months, I have been learning how to use Objective-C to build iOS apps. this is just a bit of an eye. I have to lament that this is much harder than I think.Tangle, confusion, and frustration. the actual code writing time is not even more time to find and fix bugs. But when I was able to develop my own mobile app game, I suddenly felt that all my efforts were worthwhile!On the Road to app production, I learned a lo

:[0x30] //8B400C mov eax, dword ptr [eax + 0xc] //8B401C mov eax, dword ptr [eax + 0x1c] //8B4008 mov eax, dword ptr [eax + 8] $sc = {64 A1 30 00 00 00 8B 40 0C 8B 40 1C 8B 40 08 } condition: $sc and 1 of ($mailslot,$get) } In addition to yara, This POS malware can also be detected through its URI mode. The following signature will be able to detect the malware from the network. signature LogPOS { #source: Morphick

Example of ASP. net ajax: Forum topic search The last example is to modify the existing application. The first time I heard this idea was that Josh Ledgard imagined adding a feature to the MSDN forum. The goal is to help users find their own answers and limit the number of repeated releases. Generally, when a user raises a new question in a forum, he or she will enter the subject and question. Generally, they do not search to see if they have already

use of new types of applications. "The risk is that sensitive data may be stored on a local user workstation, and attackers who access or damage the workstation can easily obtain sensitive data," Cornell said, "This is more dangerous for users who use shared computers." "By definition, it is really just capable of storing information in the client system," says Josh Abraham, a security researcher at Rapid7, "Then you have the potential capability of

(such as session IDs), said Dan Cornell, director of the Denim group's application security research department. However, HTML5 LocalStorage allows the browser to locally store a large number of data databases, allowing the use of new types of applications. "The risk is that sensitive data may be stored on a local user workstation, and attackers who access or damage the workstation can easily obtain sensitive data," Cornell said, "This is more dangerous for users who use shared computers." "By

. * sun proprietary/CONFIDENTIAL. use is subject to license terms. */package java. util;/*** @ author Josh Bloch * @ author Neal Gafter * @ version 1.56, 04/21/06 * @ see Collection * @ see List * @ see collections List * @ see Vector * @ since 1.2 */public class ArrayList ArrayList detailed analysis 1. Constructor ArrayList has three constructors ): private transient Object[] elementData; private int size; public ArrayList(int initialCapac

to instantiate instance at this time. At this point, this approach is reasonable compared to the third and fourth approaches.The sixth type (enumeration):Java code public enum Singleton { INSTANCE; public void Whatevermethod () { } } This approach is advocated by effective Java author Josh Bloch, which not only avoids multi-threaded synchronization problems, but also prevents deserialization from recreating new objects,

Machine learning Notes (i)Today formally began the study of machine learning, in order to motivate themselves to learn, but also to share ideas, decided to send their own experience of learning to the Internet to let everyone share.Bayesian learningLet's start with an example from the famous MLPP, a doctoral dissertation from Josh Tenenbaum, called a digital game.In my own words: In order to decide who washes the dishes, xiaoming and his wife decide t

(), obj); returnmethod.invoke (obj, args); } }; return(T) proxy.newproxyinstance (Obj.getclass (). getClassLoader (), obj. GetClass (). Getinterfaces (), handler);}}The output is:"Main" java.lang.ClassCastException: $Proxy 1 cannot is cast to example. Test$myinterface at example. Test2.main (Test2.java:23)You can see that when CLASS1 implements an interface proxy, it will report an exception.Therefore, this is not a mistake, it is likely that the author J