Design mode Chapter 02 Template design mode

I. Demand analysis

The steps to solve a certain kind of thing are fixed, at which point we can provide a template code for this kind of thing, thereby increasing the efficiency

Second, the pattern design:

1. Write a solution to one thing in this category (including the template section and the change section)
2. Extract the changed parts into a method that describes them as abstract methods
3. Use final cosmetic template method to prevent being rewritten

Third, code implementation

Use a simple little example to illustrate: the execution time of the calculation program

3.1 Tool Code

Abstract class calruntime{

Public final void GetTime () {
Long starttime = System.currenttimemillis (); The time when the record started
Code ();
Long endtime = System.currenttimemillis (); The time at which the record ended.
System.out.println ("Running Time:" + (Endtime-starttime));
}

public abstract void Code ();
}

3.2 Test Code

Class Testcal extends Calruntime
{
    public static void Main (string[] args)
  & nbsp {
        testcal  testcal = new testcal ();
        testcal.gettime ();
   }
    
    public  Void Code () {
        //your code
   }