[DP]書上定義:將抽象部分與它的實現部分分離,使它們都可以獨立地變化。考慮裝操作系統,有多種配置的計算機,同樣也有多款操作系統。如何運用橋接模式呢?可以將操作系統和計算機分別抽象出來,讓它們各自發展,減少它們的耦合度。當然了,兩者之間有標準的接口。這樣設計,不論是對於計算機,還是操作系統都是非常有利的。下面給出這種設計的UML圖,其實就是橋接模式的UML圖。
給出C++的一種實現:
- //操作系統
- class OS
- {
- public:
- virtual void InstallOS_Imp() {}
- };
- class WindowOS: public OS
- {
- public:
- void InstallOS_Imp() { cout<<"安裝Window操作系統"<<endl; }
- };
- class LinuxOS: public OS
- {
- public:
- void InstallOS_Imp() { cout<<"安裝Linux操作系統"<<endl; }
- };
- class UnixOS: public OS
- {
- public:
- void InstallOS_Imp() { cout<<"安裝Unix操作系統"<<endl; }
- };
- //計算機
- class Computer
- {
- public:
- virtual void InstallOS(OS *os) {}
- };
- class DellComputer: public Computer
- {
- public:
- void InstallOS(OS *os) { os->InstallOS_Imp(); }
- };
- class AppleComputer: public Computer
- {
- public:
- void InstallOS(OS *os) { os->InstallOS_Imp(); }
- };
- class HPComputer: public Computer
- {
- public:
- void InstallOS(OS *os) { os->InstallOS_Imp(); }
- };
- //操作系統
- class OS
- {
- public:
- virtual void InstallOS_Imp() {}
- };
- class WindowOS: public OS
- {
- public:
- void InstallOS_Imp() { cout<<"安裝Window操作系統"<<endl; }
- };
- class LinuxOS: public OS
- {
- public:
- void InstallOS_Imp() { cout<<"安裝Linux操作系統"<<endl; }
- };
- class UnixOS: public OS
- {
- public:
- void InstallOS_Imp() { cout<<"安裝Unix操作系統"<<endl; }
- };
- //計算機
- class Computer
- {
- public:
- virtual void InstallOS(OS *os) {}
- };
- class DellComputer: public Computer
- {
- public:
- void InstallOS(OS *os) { os->InstallOS_Imp(); }
- };
- class AppleComputer: public Computer
- {
- public:
- void InstallOS(OS *os) { os->InstallOS_Imp(); }
- };
- class HPComputer: public Computer
- {
- public:
- void InstallOS(OS *os) { os->InstallOS_Imp(); }
- };
客戶使用方式:
- int main()
- {
- OS *os1 = new WindowOS();
- OS *os2 = new LinuxOS();
- Computer *computer1 = new AppleComputer();
- computer1->InstallOS(os1);
- computer1->InstallOS(os2);
- }
- int main()
- {
- OS *os1 = new WindowOS();
- OS *os2 = new LinuxOS();
- Computer *computer1 = new AppleComputer();
- computer1->InstallOS(os1);
- computer1->InstallOS(os2);
- }
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