题目详情

某软件系统中,已设计并实现了用于显示地址信息的类Address(如图6-1所示),现要求提供基于Dutch语言的地址信息显示接口。为了实现该要求并考虑到以后可能还会出现新的语言的接口,决定采用适配器(Adapter)模式实现该要求,得到如图6-1所示的类图。

中级软件设计师,历年真题,2016年上半年(下午)《软件设计师》真题

图6-1适配器模式类图

【Java代码】

import java.util.*;

Class Address{

public void street(  ){//实现代码省略}

public void zip(  ){//实现代码省略}

public void city(  ){//实现代码省略}

//其他成员省略

};

class DutchAddress{

public void straat(  ){//实现代码省略}

public void postcode(  ){//实现代码省略}

public void plaats(  ){//实现代码省略}

//其他成员省略

};

class DutchAddressAdapter extends DutchAddress{

private(1);

public DutchAddressAdapter(Address addr){

address=addr;

}

public void straat(  ){

(2);

}

public void postcode(  ){

(3);

}

public void plaats(  ){

(4);

}

//其他成员省略

};

class Test{

public static void main(String[]args){

Address addr=new Address(  );

(5);

System.out.println("\n The DutchAddress\n");

testDutch(addrAdapter);

}

Static void?testDutch(DutchAddress addr){

addr.straat(  );

addr.postcode(  );

addr.plaats(  );

}

}

正确答案及解析

正确答案
解析

(1)Address address;

(2)address.street();

(3)address.zip();

(4)address.city();

(5)DutchAddress addrAdapter=new DutchAddressAdapter(addr);

本题考查的是面向对象程序设计,结合设计模式。本题涉及的设计模式是适配器。

对于代码填空,可以参照类图和代码上下文补充。

首先理清类与类之间的继承关系,再根据上下文填写。

对于第(1)空,DutchAddressAdapter继承了DutchAddress方法,根据下面的同名构造函数可知,该类定义了一个名叫address的参数,而根据代码上下文可以,address的类型为Address。本空应该填写Address?address;

第(2)(3)(4)空是接口转换的具体实现,而在DutchAddressAdapter涉及的方法,可以从类图中找到,分别是straat(),postcode(),plaats(),适配器的目的是接口转换,即用这些方法分别展现原有Address中的street()、zip()、city()方法,因此这3个空分别填写address.street()、address.zip()、address.city()。

对于第(5)空,根据上下文最终调用testDutch方法的对象是addrAdapter,而此处是将原有的Address对象addr转换为接口对象,因此此处填写

DutchAddress addrAdapter=new?DutchAddressAdapter(addr)。

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