Java design pattern: combined mode

Composition (overall vs. partial relationship) mode: combines different but related objects into a tree structure to achieve a "partial-overall" hierarchy, which makes the user consistent with the use of individual objects and composite objects.
* Pattern Role Composition:
* 1.Component object: Is an object interface in a composition, which is a common interface owned by all classes. is used to uniformly define the parts of the population.
2.Leaf object: The part of the population, not the next level.
3.Composite object: Used to store child parts. The component interface is implemented in part-related operations.

Take the company composition as an example, the company has a head office. Head Office under the Branch, branch office has offices and so on. form a tree structure.

/** * Abstract class: Used to manage sub-classes * @description: * @date 2016-1-22 pm 1:16:25 */ Public Abstract  class Firm {    PrivateString Firmname;//Company name     Public Firm(String firmname) { This. firmname = Firmname; } PublicStringGetfirmname() {returnFirmname; } Public void Setfirmname(String name) { This. firmname = name; }protected Abstract void Append(Firm Firm);//Join a company such as: New branch    protected Abstract void Romove(Firm Firm);//Delete company: Close Branch if for any reason    protected Abstract void Show(intlevel);//Show the level of the company: Head Office, branch office, offices, etc.}

/** * Office Object * @description: * @date 2016-1-22 pm 1:25:43 * * Public  class branchfirm extends Firm {    PrivateList<firm> cList; Public branchfirm(String name) {Super(name); CList =NewArraylist<firm> (); }@Override    protected void Append(Firm Firm)    {Clist.add (firm); }@Override    protected void Show(intDepth) {StringBuilder SB =NewStringBuilder (""); for(inti =0; I < depth; i++) {Sb.append ("*"); } System.out.println (NewString (SB) + This. Getfirmname ()); for(Firm c:clist) {C.show (depth +2); }    }@Override    protected void Romove(Firm Firm) {//TODO auto-generated method stubClist.remove (firm); }}

/** * Leaf node Category: Company Marketing department * @description: * @date 2016-1-22 pm 1:46:02 * * Public  class marketdepartment extends Firm {     Public marketdepartment(String name) {Super(name); }@Override    protected void Append(Firm Company) {    }@Override    protected void Show(intDepth) {//TODO auto-generated method stubStringBuilder SB =NewStringBuilder (""); for(inti =0; I < depth; i++) {Sb.append ("*"); } System.out.println (NewString (SB) + This. Getfirmname ()); }@Override    protected void Romove(Firm Company) {    }}

/** * Leaf node Category: Company Technical Department * @description: * @date 2016-1-22 pm 1:21:41 * * Public  class mintechdepartment extends Firm {     Public mintechdepartment(String name) {Super(name); }@Override    protected void Append(Firm Firm) {    }@Override    protected void Show(intDepth) {StringBuilder SB =NewStringBuilder (""); for(inti =0; I < depth; i++) {Sb.append ("*"); } System.out.println (NewString (SB) + This. Getfirmname ()); }@Override    protected void Romove(Firm Company) {    }}

 Public classTest { Public Static void Main(string[] args) {//TODO auto-generated method stubFirm head =NewBranchfirm ("Shenzhen XX Group Co., Ltd.");//Company headquartersHead.append (NewMarketdepartment ("Shenzhen XX Group Co., Ltd.--marketing department")); Head.append (NewMintechdepartment ("Shenzhen XX Group Co., LTD.--Technical department")); Firm jsfirm =NewBranchfirm ("Shenzhen XX Group Co., Ltd.-Jiangsu branch"); Jsfirm.append (NewMarketdepartment ("Shenzhen XX Group Co., Ltd.-Jiangsu Branch marketing Department")); Jsfirm.append (NewMintechdepartment ("Shenzhen XX Group Co., Ltd.-Jiangsu Branch Technical Department")); Firm szfirm =NewBranchfirm ("Shenzhen XX Group Co., Ltd.-Jiangsu branch-Suzhou Office"); Szfirm.append (NewMintechdepartment ("Shenzhen XX Group Co., Ltd.-Jiangsu Branch-Suzhou Office Technical Department")); Szfirm.append (NewMarketdepartment ("Shenzhen XX Group Co., Ltd.-Jiangsu branch-Suzhou Office Marketing Department")); Jsfirm.append (szfirm);//Assuming additional branch or office is required. Just follow the 第19-25 line operation.Head.append (jsfirm); Head.show (0); }} usually: Use the combined pattern in a unified way, using the overall department in general, when you need to represent the overall and partial hierarchies of an object, or if you need to ignore a combination of the overall object and part of the object.

Java design pattern: combined mode