Template method Mode

definition : A template method defines an algorithm with some abstract operations, and subclasses redefine these operations to provide specific behavior;

Intent : Defines an algorithmic framework in action that defers some steps to a subclass. The template method pattern allows subclasses to redefine specific algorithm steps without altering the algorithm structure;

Like what

Work () {

① Preparation

② implementation

③ End

}

You can declare the second step implementation as an abstract method, because each person implements a different process

1  Public classtemplatedemo{2      Public Static voidMain (String []atgs) {3Teacher t1=NewDbteacher ();4 t1.work ();5 System.out.println ();6Teacher t2=NewCteacher ();7 t2.work ();8     }9 }Ten  One Abstract classteacher{ A     //the way the teacher works (it's a process) -      Public voidprepared () { -System.out.println ("Ready Whiteboard Pen"); theSystem.out.println ("Turn on the projector"); -     } -      -      Public voidEnd () { +System.out.println ("Turn off the projector"); -SYSTEM.OUT.PRINTLN ("Lock the Door"); +     } A     //the abstract method is implemented by its subclasses. at      Public Abstract voidteaching (); -     //Template Method -      Public voidWork () { -         //1. Preparation before the lecture - prepared (); -         //2. Conduct Lectures in teaching (); -         //3. End of lecture to end (); +     } - } the  * classDbteacherextendsteacher{ $     //The implementation of abstract methods for the abstract parent classPanax Notoginseng      Public voidTeaching () { -SYSTEM.OUT.PRINTLN ("Open Oracle"); theSystem.out.println ("Writing pl-sql Instructions"); +System.out.println ("Optimize QL instructions"); A     } the } +  - classCteacherextendsteacher{ $     //The implementation of abstract methods for the abstract parent class $      Public voidTeaching () { -System.out.println ("Open VM"); -System.out.println ("Write C instruction"); theSystem.out.println ("Debug C Program"); -     }Wuyi}

Template method Mode