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对于问题领域的理解没有问题，比如：我们通过对于问题领域的分析发现AlarmDoor在概念本质上和Door是一致的，那么我们在实现时就没有能够正确的揭示我们的设计意图，因为在这两个概念的定义上（均使用interface方式定义）反映不出上述含义。 如果我们对于问题领域的理解是：AlarmDoor在概念本质上是Door，同时它有具有报警的功能。我们该如何来设计、实现来明确的反映出我们的意思呢？前面已经说过，abstract class在Java语言中表示一种继承关系，而继承关系在本质上是 "is a "关系。所以对于Door这个概念，我们应该使用abstarctclass方式来定义。另外，AlarmDoor又具有报警功能，说明它又能够完成报警概念中定义的行为，所以报警概念可以通过interface方式定义。如下所示： abstract class Door { abstract void open(); abstract void close()； }

buffer, which is read from this point. Count refers to the maximum number of bytes read. The write () method and read () method have the same parameter type. 2,What is the difference between memorystream. Position and memorystream. Seek? Both of them obtain or set the current position in the stream. It seems that the seek function completely covers the positio

console.Shell is an abstract concept, the shell of all operations in the computer, responsible for the processing of human interaction, execution of scripts, etc., is the operating system is an important part of the normal operationBASH,ASH,ZSH,TCSH is a concrete implementation of the abstract concept of the shell, wh

When routers and switches work normally, you do not need to worry too much about wiring issues. However, when the network encounters problems or changes, wiring knowledge may be of great help to you. In this article, we will introduce you to some basic wiring knowledge, and describe the details of the Cisco console dedicated network cable. The network cable belongs to the first layer of the Network: physical layer. Only the correct network cable can e

1. window is Windows Standard window with window handle, but console window has no message loop, reads data directly from buffer, displays data.Windows has its own window process, I can use SetWindowLong to modify the window process, but the console window modified to not receive the message, is the window why the

I like to use Console.log debug output XHR information, on-line when the same, do not know if there is no harm? Reply content: I like to use Console.log debug output XHR information, on-line when the same, do not know if there is no harm? Some browsers do not support the console, your JS execution will be an error ... var DEBUG=true;if(!DEBUG) window.c