Design mode (7)--Template mode

7. Template Mode//ver1//exam paper class Testpaper{public:void TestQuestion1 () {}void TestQuestion2 () {}virtual string Answer1 () { Return "";} Virtual String Answer2 () {return "";}}; Class Testpapera:public Testpaper{public:void TestQuestion1 () {testpaper::testquestion1 ();//a answer 1answer1 ();} void TestQuestion2 () {testpaper::testquestion2 ();//a answer 2answer2 ();} String Answer1 () {return "A";} String Answer2 () {return "B";}}; Class Testpaperb:public Testpaper{public:void TestQuestion1 () {testpaper::testquestion1 ();//b answer 1answer1 ();} void TestQuestion2 () {testpaper::testquestion2 ();//b answer 2answer2 ();} String Answer1 () {return "C";} String Answer2 () {return "D";}}; void Main1 () {testpaper * Pstua = new Testpapera ();p stua->testquestion1 ();p stua->testquestion2 (); Testpaper * pstub = new Testpaperb ();p stub->testquestion1 ();p stub->testquestion2 ();} Template mode: Defines the skeleton of an algorithm in an operation, and delays some steps into subclasses. Template mode allows subclasses to redefine some specific steps of the algorithm without altering the structure of an algorithm. Template mode shows its advantages by moving the invariant behavior to the superclass and removing the duplicated code in the subclass.

　　

Design mode (7)-Template mode