(C #) prototype mode-deep copy and shallow copy

1. Prototype mode

Use the prototype instance to specify an instance of the created object, and create a new object by copying the prototypes.

* Prototype mode hides the details of creating objects and improves performance.

* Shallow copy: All variables of the copied object contain the same value as the original object, and all references to other objects point to the original object.

* Deep copy: The reference to the copied object points to the new object, not the original referenced object.

*. NET provides the only method under the Iconeable interface clone can easily complete the prototype mode implementation.

2. Example:

namespaceprototype Mode _ shallow copy {classProgram {Static voidMain (string[] args) {Resume a=NewResume ("Big Bird"); A.setpersonalinfo ("male"," at"); A.setworkexperience (" -","XX Company"); Resume b=(Resume) A.clone (); B.setworkexperience ("male","yy company");            A.display (); B.display ();//a shallow copy makes the referenced copy point to the same space, and A's work experience is covered by BConsole.read (); }    }        classWorkexperience {Private stringworkdate;  Public stringWorkdata {Get{returnworkdate;} Set{workdate =value;} }        Private stringCompany ;  Public stringCompany {Get{returnCompany ;} Set{company =value;} }    }    classresume:icloneable {Private stringname; Private stringsex; Private stringAge ; Privateworkexperience work;  PublicResume (stringname) {             This. Name =name; work=Newworkexperience (); }         Public voidSetpersonalinfo (stringSexstringAge ) {             This. Sex =sex;  This. Age =Age ; }         Public voidSetworkexperience (stringWorkdata,stringCompany ) {work. Workdata=Workdata; Work.company=Company ; }         Public voidDisplay () {Console.WriteLine ("{0} {1} {2}", name, sex, age); Console.WriteLine ("Shallow copy: {0} {1}", work.        Workdata, Work.company); }         Public ObjectClone () {return(Object) This.        MemberwiseClone (); }    }}

At this point the output, a, and all details are identical.

namespacePrototype Mode _ deep copy {classProgram {Static voidMain (string[] args) {Resume a=NewResume ("Big Bird"); A.setpersonalinfo ("male"," at"); A.setworkexperience (" -","XX Company"); Resume b=(Resume) A.clone (); B.setworkexperience ("male","yy company");            A.display (); B.display ();//a shallow copy makes the referenced copy point to the same space, and A's work experience is covered by BConsole.read (); }    }    classworkexperience:icloneable {Private stringworkdate;  Public stringWorkdata {Get{returnworkdate;} Set{workdate =value;} }        Private stringCompany ;  Public stringCompany {Get{returnCompany ;} Set{company =value;} }         PublicObject Clone () {return(Object) This.        MemberwiseClone (); }    }    classresume:icloneable {Private stringname; Private stringsex; Private stringAge ; Privateworkexperience work;  PublicResume (stringname) {             This. Name =name; work=Newworkexperience (); }         PublicResume (workexperience work) { This. Work =(workexperience) work.        Clone (); }         Public voidSetpersonalinfo (stringSexstringAge ) {             This. Sex =sex;  This. Age =Age ; }         Public voidSetworkexperience (stringWorkdata,stringCompany ) {work. Workdata=Workdata; Work.company=Company ; }         Public voidDisplay () {Console.WriteLine ("{0} {1} {2}", name, sex, age); Console.WriteLine ("Deepreplication: {0} {1}", work.        Workdata, Work.company); }         Public ObjectClone () {Resume obj=NewResume ( This. Work); Obj.name= This. Name; Obj.sex= This. Sex; Obj.age= This. Age; returnobj; }    }}

b in modifying the attributes in work experience is not affected in a.

(C #) prototype mode-deep copy and shallow copy