Design pattern (builder)

The builder pattern is used to create relatively complex, composed objects. It includes several types of roles:

• Product: The object to be created, in this case the table
• Builder: Create an abstraction of an object method, in this case Tablebuilder
• ConcreteBuilder: The implementation of a specific creation, in this case Tablebuilderimpl
• Director: Package Builder interface

The class diagram relationships are as follows:

The code is as follows:

• Table

 Packagecom.example; Public classTable {PrivateString Head; PrivateString content; PrivateString footer;  PublicString GetHead () {returnHead; }     Public voidSethead (String head) { This. Head =Head; }     PublicString getcontent () {returncontent; }     Public voidsetcontent (String content) { This. Content =content; }     PublicString Getfooter () {returnfooter; }     Public voidsetfooter (String footer) { This. Footer =footer; }         PublicString getTable () {return  This. Head + "_" + This. Content + "_" + This. Footer; }}

• Tablebuilder

 Public Interface Tablebuilder {    public  tablebuilder settablehead (String head);      Public tablebuilder settablecontent (String content);      Public tablebuilder settablefooter (String footer);      Public Table Builder ();}

• Tablebuilderimpl

 Packagecom.example; Public classTablebuilderimplImplementsTablebuilder {Privatetable table; Private Static FinalString TYPE = "TYPE1";  PublicTablebuilderimpl () {table=NewTable (); } @Override PublicTablebuilder Settablehead (String head) {table.sethead (TYPE+head); return  This; } @Override Publictablebuilder settablecontent (String content) {table.setcontent (TYPE+content); return  This; } @Override Publictablebuilder settablefooter (String footer) {table.setfooter (TYPE+footer); return  This; } @Override PublicTable Builder () {returntable; }}

• Director

 Public class Director {    private  tablebuilder builder;          Public Director (Tablebuilder builder) {        this. Builder = builder;    }           Public Table Builder () {        return builder.settablehead ("Head")                . Settablecontent ( "Content")                . Settablefooter ("Footer")                . Builder ();    }}

• APP

 Public class App {    publicstaticvoid  main (string[] args) {        new Director (new  Tablebuilderimpl ());         = Direct. Builder ();        System.out.println (Table.gettable ());}    }

Design pattern (builder)