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Source: http://bbs.csdn.net/topics/300192417There are three main types of classes in UML: Boundary classes, control classes, and entity classes. The concept of introducing boundary classes, control classes, and entity

The content of this article is transferred from blog: http://www.cnblogs.com/mengdd/archive/2013/02/08/2909307.htmlThe related classes are organized together, reducing the clutter in the namespaces.An inner class can be defined in another class and can be defined in a function or even as part of an expression.　　the inner classes in Java are divided into four types :　　Static inner class static inner class (a

Internal classes are defined in Wikipedia as: In object-oriented programming, an inner class (also called a nested Class) is a class that is declared in another class or interface. The inner class differs from the subclass (subclass). (Translator Note: the wiki annotations are incorrect, and the inner and nested classes are not identical, see below.) ）In Java, the above definition can be an example of the f

1: Problems with formal parameters and return values (understanding)(1) Formal parameters:Class Name: An object that requires this classAbstract class Name: A subclass object that requires this classInterface Name: An implementation class object that requires this interface(2) Return value type:Class Name: Returns the object of the classAbstract class Name: Returns the subclass object of the classInterface Name: An object that returns an implementation class for the interface(3) Chain-type progr

The FileInputStream and FileOutputStream classes are used to create the input and output stream objects for disk files, using their constructors to specify the file path and file name. When you create an FileInputStream instance object, the specified file should be present and readable. When you create an FileOutputStream instance object, the original content in this file is overwritten if the specified file already exists. Two ways to create

The number of inheritance between classes and classes, classes and interfaces, and interfaces. 1. Classes and classes can be represented as inheritance relationships, expressed by the extends keyword. This is because if A class inherits Class A and Class B, if AB has two si

The previous chapter says that delegates are one of the most effective strategies for creating thread-safe classes by simply having existing thread-safe classes manage all the state. So this chapter is about how to use the Java Platform Class Library of the concurrent base building module?5.1 Synchronizing Container classesIncludes vectors and Hashtable, as well as some of the functionally similar

Label: Java inherited class Interface1. Classes and classes can be represented as inheritance relationships, expressed by the extends keyword. This is because if a class inherits Class A and Class B, if AB has two similar methods, it cannot determine which method to inherit, therefore, class inheritance can only be one-to-one. However, a class can have multiple subclasses,A class can have only one parent cl

attributeAssign values at the same time when declaring, often with staticDo not assign value at declaration, must be assigned in constructor methodGeneral principle: Ensure that when each object is created, the final attribute learns that it is determinedCases:4. Final modification parametersThe final keyword is added before the method parameter in order to prevent the data from being modified in the method body.Iii. the relationship between class and class1. Association relationship1), Correla

The interface class is not instantiated and requires one by one of all methods that implement the interface definition. Keyword interface implementsInterface interface is a rule that gives people inheritance with something that's kind of like abstract classThe method defined in the inside, but does not instantiate, but needs other classes to implements it, and must implement all the methods of the interface definition,In fact, the interface class is p

(file2), bw = new BufferedWriter (FW); Bw.write (sbff.tostring ());} catch (FileNotFoundException e) {//Todo auto-generated catch Blocke.printstacktrace ();} catch (IOException e) {//Todo Au To-generated catch Blocke.printstacktrace ();} Finally{try {br.clOSE (); Bw.close ();} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();}}}then the code that generates the method class:Finally, the code that generates the view interface: Copyright NOTICE: This article for Bo Mast