Learn the list of basic knowledge of Java data structures

public class Link {public int idata;public double ddata;public link next;public link (int iData, double dData) {super (); thi S.idata = Idata;this.ddata = DData;} public void DisplayLink () {System.out.print ("{" +idata+ "," +ddata + "}");}}

public class Linklist {private Link first;public void linklist () {First =null;} Whether the linked list is empty public boolean isEmpty () {return (first ==null);} Insert first header element public void Insertfirst (int id,double dd) {link NewLink =new link (ID, dd); Newlink.next =first;first =newlink; }//Delete the list header element public link deletefirst () {link templink =first;first =first.next;return templink;} Find a specific node public Link find (int key) {link current =first;while (current.idata!=key) {if (Current.next ==null) {return null;} else {current =current.next;}} return current;} Delete node public Link Delete (int key) {link Currentlink =first; Link previous=first;while (Currentlink.idata!=key) {if (Currentlink.next ==null) {return null;} else {previous =currentlink;currentlink =currentlink.next;}} if (Currentlink ==first) {first =first.next;} Else{previous.next =currentlink.next;} return currentlink;} Insert a specific node public Boolean insertlink (int key, int iData, double dData) {int i=0; Link Currentlink =first; Link previous =first; Link NextLink; Link newLink =new link (iData, dDaTA);//Insert Header element if ((I==key) && (currentlink!=null)) {Newlink.next =currentlink;first=newlink;return true;} else if (currentlink!=null) {//i++;while (i!= (key-1)) {if (Currentlink.next ==null) {Currentlink.next=newlink;return true;} else {previous =currentlink;currentlink =currentlink.next;i++;}} if (Currentlink.next!=null) {NextLink =currentlink.next;currentlink.next=newlink;newlink.next=nextlink;return True ;} else {Currentlink.next =newlink;newlink.next =null;return true;}} else if (Currentlink ==null) {Currentlink =newlink;first=newlink;first.next=null;return true;} return false;} Show linked list all data public void Displaylist () {System.out.println ("linklist.displaylist () List (first-->last):"); Link currentlink =first;while (currentlink!=null) {currentlink.displaylink (); Currentlink =currentlink.next;} System.out.println (""); System.out.print ("Linklist.displaylist () Finish");}}

public class Linklistapp {public static void main (string[] args) {linklist thelinklist =new linklist (); Thelinklist.insertlink (9, 999, 999.999); Thelinklist.displaylist (); Thelinklist.insertfirst (22, 22.22); Thelinklist.insertfirst (33.33), Thelinklist.insertfirst (44.44), Thelinklist.insertfirst (55, 55.55); Thelinklist.displaylist (); Thelinklist.insertlink (2, 333, 333.333); Thelinklist.displaylist (); Thelinklist.insertlink (7, 777, 777.777); Thelinklist.displaylist (); System.out.println (""); while (!thelinklist.isempty ()) {Link aLink =thelinklist.deletefirst (); System.out.print ("Deleted"); Alink.displaylink (); System.out.println ("");}    Thelinklist.displaylist ();}}

Learn the list of basic knowledge of Java data structures