The question of the Nottingham Tower implemented by the idea of Java object-oriented

 Packagehanoi.com; Public classDisc {PrivateString name; Private intLevel ;  PublicDisc () {name= "Disc"; level= 0; }     PublicDisc (String name,intLevel ) {         This. Name =name;  This. Level =Level ; }         PublicString GetName () {returnname; }     Public intGetlevel () {returnLevel ; } @Override PublicString toString () {return"Name:" + This. name + "; Level:" + This. Level; }}

 Packagehanoi.com;Importjava.util.LinkedList;Importjava.util.List; Public classPost {//used to install disc .    Privatelist<disc> lists =NewLinkedlist<disc>(); PrivateString name; PublicString GetName () {returnname; }     PublicPost (String name) { This. Name =name; }     Public voidAdd (Disc Disc) {if(Disc = =NULL)return;  This. Lists.add (0, disc); }     Public voidAdd (list<disc>discs) {        if(Discs = =NULL|| Discs.size () < 1) {            return; } lists.addall (0, discs); }    //the plates in the current column are moved to Targetpost with Middlepost.     Public voidMove (post middlepost, post Targetpost,postmove postmove) { This. Move ( This. Lists.size (), Middlepost, Targetpost, Postmove); }    Private voidMoveintTotal , post post1, post Post2,postmove postmove) {        if(Total <= 0)return;  This. Move (Total-1, Post2, Post1,postmove); Disc Disc= This. Lists.remove (0); if(Postmove! =NULL) {postmove.action ( This, Post1,post2, disc);                } post2.add (disc); Post1.move ( Total-1, This, Post2,postmove); } @Override PublicString toString () {return"Post [lists=" + Lists + ", name=" + name + "]"; }}

 Package hanoi.com;  Public Interface Postmove {    publicvoid  action (post Scrpost,post middlepost, post targetpost, Disc disc);}

 Packagehanoi.com.test;ImportHanoi.com.Disc;ImportHanoi.com.Post;ImportHanoi.com.PostMove; Public classMain { Public Static voidMain (string[] args) {Post post1=NewPost ("A"); Post Post2=NewPost ("B"); Post Post3=NewPost ("C"); Post1.add (NewDisc ("3", 2)); Post1.add (NewDisc ("2", 1)); Post1.add (NewDisc ("1", 0));        System.out.println (POST1);        System.out.println (POST2);                System.out.println (POST3); Post1.move (Post2, Post3,NewPostmove () {@Override Public voidaction (Post srcpost, post Middlepost,post targetpost, Disc Disc) {System.out.println (Disc+ ": from" + srcpost.getname () + "through" + middlepost.getname () + "arrival" +targetpost.getname ());        }        });        System.out.println (POST1);        System.out.println (POST2);    System.out.println (POST3); }}

The question of the Nottingham Tower implemented by the idea of Java object-oriented