题目内容

Industrial safe operation has long been a matter of considerable concern of our government. Hove-ever, the occurrence of accidents, especially of death accidents is still increasing in the past five years despite much governmental effort, There is a discussion in a newspaper about how to curb the rising of death accidents effectively.
Write an essay for the same newspaper to
(1)describe the drawing,
(2)analyze the reasons, and
(3)state your position.
In your essay, make full use of the information provided in the drawing printed below.
You should write 160~200 words on ANSWER SHEET2.

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经营者对消费者就其提供的商品或者服务的质量和使用方法等问题提出的询问,应当作出真实、明确的答复。()

阅读下列函数说明和C++代码,将应填入(n)处的字句写在对应栏内。
[说明]
在一些大型系统中,大多数的功能在初始化时要花费很多时间,如果在启动的时候,所有功能(包括不用的功能)都要全面初始化的话,会导致应用软件要花很多时间才能启动。因此常将程序设计成到了实际要使用某种功能的阶段才初始化该功能。
以下示例展示了Proxy(代理)模式,PrinterProxy类执行一些比较“轻”的方法,需要真正执行“重”的方法时才初始化Print类。图5-1显示了各个类间的关系。
[图5-1]
[C++代码]
class Printable{
public:
virtual void setPrinterName(string name)=0;
virtual string getprinterName()=0;
virtual void print(string name)=0;
};
class Printer:public Printable{
private:
string name;
public:
Printer(string name){
cout<<"正在产生Printer的对象实例"<<endl;
this->name=name;
}
void setPrinterName(string name){
this->name=name;
}
string getPrinterName(){
return name;
}
void print(string msg){
cout<<"======="<<name<<"==========="<<endl;
cout<<msg<<endl;
}
};
class printerproxy :public (1) {
private:
String name;
Printer *real;
public:
PrinterProxy(string name){
(2)=NULL;
this->name=name;
}
void setPrinterName(string name){
if((3))real->setPrinterName(name);
this->name=name;
}
string getPrinterName(){
return name;
}
void print(string msg){
(4);
real->print(msg);
}
void realize(){
if(real==NULL)real=(5);
}
};
(1)

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