Java

Abstract class Abstractcolleague{public abstract void workself ();public abstract void Requestothershelp ();}Class Colleaguea extends Abstractcolleague{Mediator amediator=new Mediator ();public void Workself (){System.out.println ("Colleaguea-->work"

Abstract class Health{private int blood;private int mana;public void Setblood (int blood){This.blood=blood;}public int Getblood (){return blood;}public void Setmana (int mana){This.mana=mana;}public int Getmana (){return mana;}Public abstract

 * 单例模式Singleton* Application: Some objects need only one is enough, such as the Emperor * 作用： 保证整个应用程序中某个实例有且只有一个 * 区别： 饿汉模式的特点是加载类时比较慢，但运行是比较快-线程安全          懒汉模式的特点是加载类时比较快，但运行时比较慢-线程不安全1. A Hungry man1 //2 Public class Singleton1 {3

The Java keyword This can only be used in a method method body. When an object is created, the Java Virtual Machine (JVM) assigns a pointer to the object that refers to itself, which is the name of this pointer. Therefore, this can only be used in

1. Inherit thread　　 Public class extends thread{ publicvoid run () { System.out.println () {Thread.CurrentThread (). GetName ()); } Public Static void Main (string[] args) { new testthread (); T.start (); }}2.

Public class Demo{/** TestThe difference between i++ and ++i in Operation */ public static void main (string[] args) { int i = 1 int j = Span style= "COLOR: #af69bb" >1 /*a The result is 1 i++ is not to consider the

Method Summary1 Char    charAt(int index)Returned at the specified index.charValue.index-charThe index of the value.2 stringconcat(String str)Connects the specified string to the end of this string.str-Connect to thisStringEnd ofString。substring(int 

Wrote a test and tried the Java StringBuilder class.The code is as follows:Import Java.util.Scanner;public class StringBuilder1{public static void Main (string[] args){Scanner in = new Scanner (system.in);System.out.println ("Start building a string

Abstract Factory pattern is a further abstraction of the factory method pattern, in its English words "provide an interface for creating families of related or dependent obj ECTs without specifying their concrete classes ", translate," provides an

Java environment variable setting methodConfiguring the JDK environment variable under Windows XP: (Windows7 similar)1, install the JDK, the installation process can customize the installation directory and other information,For example, we choose

Six basic principles of design patterns There are a lot of related content on the Internet, but most of them are too complicated. So here I want to use an article to summarize and summarize these six principles, some of the content in this article

Lucene 4.x Spellcheck instructions for use, lucenespellcheck Spellcheck is a new version of Lucene. Before introducing spellcheck, we need to understand that Spellcheck supports several data sources. The Spellcheck constructor needs to pass in the

Install plug-ins in link mode in Eclipse, eclipselinkI. eclipse installation location and file storage location Eclipse installation path: D: \ ProgramFile \ eclipseFile Storage: D: \ mydepIi. Download plug-ins PropertiesEditor is downloaded

Dependency inversion principle of design pattern Principle and Design Pattern principle Inversion The Dependence Inversion Principle is dependent on abstraction, not specific. Simply put, it is to program the abstraction and do not program the

Differences between mybatis # {} and $ {} and order by injection, Preface, go straight to the topic .. # {} Is equivalent to preparedstatement in jdbc $ {} Is the value of the output variable. You may not be clear, so it doesn't matter if we look at

122345 arrange randomly to find the number that meets the conditions, and 122345 to find out Question requirements: 1. The six numbers must contain 122345. 2. the third digit (a hundred digits) cannot be 4 3. Output all numbers that meet the

Re-learning java basics (4): thread creation and execution, java thread 1. inherit from Thread 　　 public class TestThread extends Thread{ public void run(){ System.out.println(Thread.currentThread().getName()); } public static

Java design pattern-adapter PatternPreface The adapter mode is used as an adaptation between the required functions and the interfaces to be provided, so that the two can be seamlessly connected. For example, in real life, the computer charging

Principle of design pattern-the principle of RYS replacementAs the high-level principle of OO, The OCP advocates the use of abstract action and Polymorphism to change the static structure in the design to a dynamic structure, so as to maintain the

An optimization solution for processing big data in javaI have mentioned to you that our company is currently working on a mobile app store project. We have tested an average of 2000 requests per minute, about 50 requests per second. Now there must