ada 3 class
Class node.java
/*
* To change this
template, choose Tools | Templates
* and open the
template in the editor.
*/
package javaapplication3;
/**
*
* @author Dani AW
*/
public class node {
private node next;
private node prev;
private String
data;
private String
nama;
private String
NIM;
public node
(String input){
data = input;
}
public String
getData(){
return data;
}
public void setNext(node input){
next = input;
}
public node
getNext(){
return next;
}
public void
setPrev(node input){
prev = input;
}
public node
getPrev(){
return prev;
}
}
Class dbkls.java
/*
* To change this template,
choose Tools | Templates
* and open the
template in the editor.
*/
package javaapplication3;
/**
*
* @author Dani AW
*/
public class dblkls {
private node
first; //menyimpan node pertama
private node last;
//menyimpan node terakhir Linklist
private node temp;
//variabel pembantu
private node
index; //variabel pembantu
public void
addFirst(String input){ //menambah node diawal
node n =
new node(input); //membuat node
if(first==null){ //kondisi linklist kosong
first=n; //mengeset n pada first dan last
last=n;
}
else{ //kondisi sama ketika berisi 1 node dan
banyak node
n.setNext(first); //mengeset pointer next pada node n menuju ke first
first.setPrev(n); //mengeset pointer prev pada node first menuju ke n
first
= n; //menjadikan n sebagai first
}
}
public void
addAfterFirst(String input){ //menambah node ke setelah pertama
node n = new node(input);
if(first==null){
first=n;
last=n;
}
else
if(first==last){
first.setNext(n); //ada beberapa alternatif penulisan
n.setPrev(first);
last=n;
}
else{
//node dalam linklist lebih dari satu
index = first.getNext();
n.setNext(index);
index.setPrev(n);
first.setNext(n);
n.setPrev(first);
}
}
public void
addBeforeLast(String input){ //menambah
node sebelum terakhir implementasikan...
node n = new
node(input);
if(first==null){
first=n;
last=n;
}
else
if(first==last){
last.setPrev(n);
n.setNext(first);
first=n;
}
else{
index=last.getPrev();
n.setNext(last);
last.setPrev(n);
index.setNext(n);
n.setPrev(index);
}
}
public void
addLast(String input){ //menambah node
pada akhir implementasikan.....
node n = new
node(input);
if(first==null){
first=n;
last=n;
}
else
if(first==last){
first.setNext(n);
n.setPrev(first);
last=first.getNext();
}
else{
last.setNext(n);
n.setPrev(last);
last=n;
}
}
public String
removeFirst(){
if
(first==null){
return null;
}
else if
(first == last){
temp = first;
first = null;
last = null;
return temp.getData();
}
else{
temp = first;
first = first.getNext();
first.getPrev().setNext(null);
first.setPrev(null);
return temp.getData();
}
}
public String
removeLast(){ //implementasikan
if(first==null){
return
null;
}
else
if(first==last){
temp=first;
first=null;
last=null;
return
temp.getData();
}
else{
temp=last;
last=temp.getPrev();
temp.setPrev(null);
last=null;
return
temp.getData();
}
}
public String
getFirst(){
if
(first!=null){
return
first.getData();
}
else{
return
null;
}
}
public String
getLast(){
if
(first!=null){
return
last.getData();
}
else{
return
null;
}
}
}
Class DOubleLinkedLIst
/*
* To change this
template, choose Tools | Templates
* and open the
template in the editor.
*/
package javaapplication3;
import java.util.Scanner;
/**
*
* @author Dani AW
*/
public class DOubleLinkedLIst {
/**
* @param args the
command line arguments
*/
public static void
main(String[] args) {
// TODO code
application logic here
boolean
kondisi = true;
dblkls ojk =
new dblkls();
while(kondisi){
System.out.println("\nPROGRAM DOUBLE LINK LIST");
System.out.println("==============================");
System.out.println("Memilih menu");
System.out.println("1. Tambah di awal");
System.out.println("2. Tambah setelah awal");
System.out.println("3. Tambah sebelum akhir");
System.out.println("4.
Tambah di akhir");
System.out.println("5. Hapus di awal");
System.out.println("6. Hapus di akhir");
System.out.println("7. Lihat awal");
System.out.println("8. Lihat akhir");
System.out.println("9. Keluar");
System.out.println("==============================");
System.out.print(">> ");
Scanner kal = new Scanner(System.in);
int menu = kal.nextInt();
System.out.println("==============================\n");
Scanner dt
= new Scanner(System.in);
if(menu==1){
System.out.print("Masukan data : ");
String
data1 = dt.nextLine();
ojk.addFirst(data1);
}
else
if(menu==2){
System.out.print("Masukan data : ");
String
data2 = dt.nextLine();
ojk.addAfterFirst(data2);
}
else
if(menu==3){
System.out.print("Masukan data : ");
String
data3 = dt.nextLine();
ojk.addBeforeLast(data3);
}
else
if(menu==4){
System.out.print("Masukan data : ");
String
data4 = dt.nextLine();
ojk.addLast(data4);
}
else
if(menu==5){
if(ojk.getFirst()!=null){
ojk.removeFirst();
System.out.println("Data telah dihapus !!");
}
else{
System.out.println("Data kosong !!");
}
}
else
if(menu==6){
if(ojk.getLast()!=null){
ojk.removeLast();
System.out.println("Data telah dihapus !!");
}
else{
System.out.println("Data kosong !!");
}
}
else
if(menu==7){
if(ojk.getFirst()==null){
System.out.print("data kosong");
}
else{
System.out.println(ojk.getFirst());
}
}
else
if(menu==8){
if(ojk.getLast()==null){
System.out.print("data kosong");
}
else{
System.out.println(ojk.getLast());
}
}
else
if(menu==9){
kondisi=false;
}
}
}
}
