hungry buzzard

Reprint Please specify source: http://blog.csdn.net/lhy_ycu/article/details/39784403Singleton mode (Singleton): is a common design pattern. In Java applications, singleton objects guarantee that only one instance of the object exists in a JVM. The main benefits are: 1, some classes are created more frequently, for some large objects, this is a very large system overhead. 2, eliminate the new operator, reduce the use of system memory frequency, reduce the GC pressure.There are two main ways to re

In the book "Java and Patterns" of Dr. Shanhong, this describes the singleton pattern:　　As an object's creation mode, Singleton mode ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class.Structure of the Singleton patternthe characteristics of the singleton mode: A singleton class can have only one instance. The Singleton class must create its own unique instance. The Single

implemented in two ways: lazy and a hungry man-type1, lazy typeFor lazy-type, it is generally necessary in the getinstance () method to first determine whether the instance is empty, that is, the first time the access to the IF statement, and then return to the instance, such as the following code: privatestaticnull;publicstaticgetInstance(){ if(obj==null) new lanhanObject();//创建新的 return obj;}Lazy There is a drawback that he may m

In the book "Java and Patterns" of Dr. Shanhong, this describes the singleton pattern:　　As an object's creation mode, Singleton mode ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class. Structure of the Singleton patternthe characteristics of the singleton mode: A singleton class can have only one instance. The Singleton class must create its own unique instance. The

In the book "Java and Patterns" of Dr. Shanhong, this describes the singleton pattern:　　As an object's creation mode, Singleton mode ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class. Structure of the Singleton patternthe characteristics of the singleton mode: A singleton class can have only one instance. The Singleton class must create its own unique instance. The

, we need MDP to provide more information. You don't need a MDP to tell yourself you're hungry to eat, but the mechanism of reinforcement learning needs it This MDP adds a reward mechanism, and each time you turn to a state, you get a reward. In this case, because the next state is starvation, you get a negative reward, and if the next state is starvation, it gets a more negative reward. If you have enough, you will receive a positive reward. Now th

seven ways of writing A single example pattern has many advantages and disadvantages, and now we look at various patterns. 1, a hungry man type public class Singleton { private static Singleton instance = new Singleton (); Private Singleton () { } public static Singleton getinstance () {return instance; } } This way and name is very appropriate, desperate, in class loading time to create, no matter you

Getsingleton () is synchronized, resulting in unnecessary synchronization overhead and is not recommended for useA Hungry man mode:public class Singleton {private Singleton () {};//Private constructor: Make external cannot use constructor to create the object private static final Singleton msingleton=new Singleton ();//private static constant and instantiation: private guarantees only internal access to the variable, static is related to the cl

garbage collection thread. Of course, there are advantages, the popular spring framework is the default support singleton mode (relative to the spring container). How to implement a single example:There are many different ways to implement a singleton pattern, but we will consider the following points: Constructors must be private, not allowed to be instantiated by others This singleton typically has a private static variable in the class The singleton typically provid

This article focuses on some basic algorithms, which are the cornerstone of many other algorithms.It mainly includes simulation, violence, enumeration, recursion, greed, and division .1, Analog:As the name implies, simulation is ... Hungry, simulation, there are some topics that give you some steps, and then you write the code step-by-step to simulate those steps on the line. This kind of topic mainly belongs to the basic problem, but of course if nee

Design pattern classification is more, here first to learn a singleton modeSingleton mode : In a Java application, a singleton object can be guaranteed to exist in one JVM with only one instance of the object . Divided into a hungry man type, Raikhan type, etc.Our upper and lower code:1 Packagecom.learn.chap03.sec18;2 3 Public classSingleton1 {4 5 /**6 * Construction method Private 7 */8 PrivateSingleton1 () {9 Ten } One

Concept: The design pattern is a set of repeated use, most people know, through the classification purposes, code design experience Summary.Purpose: The design pattern is used for reusable code, making it easier for others to understand and ensure the reliability of the code.Usage scenarios for a singleton pattern:Many times there are objects that we only need, such as configuration files, tool classes, thread pools, caches, logs, and so on.Creating multiple instances can lead to many problems,

Single-Case modeA singleton pattern is the creation of a unique object for a class and provides a way for the global scope to access the object. It seems a little obscure ..., for example, in a subway station, there is usually only one toilet, but the toilets are open and passengers can use the toilet when they need it. OK, so in the above example, the subway station is the program we want to develop, and the toilet as a concept is a class name, and the subway station inside the only specific to

framework is the default support for single case mode (relative to spring container).How to implement a single example:There are many different ways to implement a single case pattern, but here are a few things we'll consider at the same time:• Constructors must be private, not allowed to be arbitrarily instantiated by others• This single example typically has a private static variable in the class• This single example generally provides a static public method for obtaining the single case (glo

Fish. Because the intensity of each hand Pat is getting bigger and bigger, and the maximum strength is reached when it is photographed on The acupoint, the force of this Pat is penetrating, after the acupoint is photographed, you need to go deeper. In this way, isn't it just a pair of yin and yang fish? Exercise this skill, there is a taiji movement around our body. Isn't there a taiji body? Rangu is the hero of kaiweiIn our life, many of us don't want to eat anything when we are sad, angry, ne

Source: In 1965, Dijkstra posed and solved a synchronization problem he calledDining Philosophers Problem. Since that time, everyone inventing yet another synchronization primitive has felt obligated to demonstrate how wonderful the new primitive is by showing how should it solves the Dining Philosophers problem. the problem can be stated quite simply as follows. five philosophers are seated around a circular table. each philosopher has a plate of spaghetti. the spaghetti is so slippery that

and began to observe the strange couple.After a while, the waiter took back a bowl of steaming wonton and put it in front of a woman, saying, "Please use them slowly ."When she saw her eyes lit up, she put her face on the bowl and breathed a deep sigh of relief. Then she stirred the wonton in the bowl with a spoon, as though she was reluctant to eat, I haven't seen it in my mouth for a long time.The man glared at the man and the woman, and turned his head around again. He felt that everyone was

ArticleDirectory 3.1 identify Singleton Mode 3.2 Implementation of lazy and hungry Chinese 3 mode explanation 3.1 recognition Singleton Mode (1) singleton mode the singleton mode is used to ensure that this class is created only one class instance during running, in addition, the singleton mode also provides a globally unique access point for this class instance, that is, the getinstance method. This global access point is the same

In the book "Java and Patterns" of Dr. Shanhong, this describes the singleton pattern:　　As an object's creation mode, Singleton mode ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class.Structure of the Singleton patternthe characteristics of the singleton mode: A singleton class can have only one instance. The Singleton class must create its own unique instance. The Single

In the book "Java and Patterns" of Dr. Shanhong, this describes the singleton pattern:　　As an object's creation mode, Singleton mode ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class.Structure of the Singleton patternthe characteristics of the singleton mode: A singleton class can have only one instance. The Singleton class must create its own unique instance. The Single