Creation Mode (III): builder Mode)

Separate the internal representation of a product from the product generation process to generate a product object with different internal representations. The construction mode allows the product's internal appearance to change independently, so that the customer does not have to know the details of the product's internal composition. The construction mode enforces a step-by-step construction process.

Example:

 1   Class House {
 2       Private String base;
 3       Private String wall;
 4       Private String roof;
 5       Public String getbase (){
 6          Return Base;
 7 }
 8       Public   Void Setbase (string base ){
 9           This . Base = base;
 10 }
 11       Public String getwall (){
 12           Return Wall;
13 }
 14       Public   Void Setwall (string wall ){
 15           This . Wall = wall;
 16 }
 17       Public String getroof (){
 18           Return Roof;
 19 }
20       Public   Void Setroof (string roof ){
 21           This . Roof = roof;
 22 }
 23       Public String tostring (){
 24           Return   This . Base + "" + This . Wall + "" + This . Roof;
25 }
 26 }
 27  
 28   Interface Builder {
 29       Public   Void Bucket parta ();
 30       Public   Void Buildpartb ();
 31       Public   Void Buildpartc ();
 32       Public House getrusult ();
 33 }
 34  
 35   Class Housebuilder Implements Builder {
 36       Private House house;
 37       Public Housebuilder (){
 38 House = New House ();
 39 }
 40       Public   Void Bucket parta (){
 41 House. setbase ("Foundation Construction completed ");
 42 }
 43       Public   Void Buildpartb (){
 44 House. setwall ("wall construction completed ");
45 }
 46       Public   Void Buildpartc (){
 47 House. setroof ("roof built ");
 48 }
 49       Public House getrusult (){
 50           Return House;
 51 }
 52 }
 53  
 54   Class Director {
 55       Public House construct (builder bulider ){
 56 Bulider. Bucket parta ();
 57 Bulider. buildpartb ();
 58 Bulider. buildpartc ();
 59           Return Bulider. getrusult ();
 60 }
 61 }
 62  
 63   Public   Class Test {
 64       Public   Static   Void Main (string [] ARGs ){
 65 Director d = New Director ();
 66 House = D. Construct (New Housebuilder ());
 67 System. Out. println (house );
 68 }
 69 }

At this time, we can build any house, only the foundation, only the wall, only the roof, any combination ...... (-Is that a house)