Contoh Aplikasi Insert, Update, Delete Penjualan Smartphone atau HP dengan Java NetBeans IDE

Berikut contoh aplikasi CRUD preorder smartphone Oppo F4s dengan Java Netbeans : 

package aplikasi_preorder_hp;
//Kuman Merah
//https://kumanmerah.blogspot.co.id/
//Semoga Bermanfaat
import java.util.Scanner;

class node {

    node next;
    node prev;
    int data;
    String nama;
    node pesanan;

    node(int databaru, String namabaru, node pesanan) {
        this.data = databaru;
        this.nama = namabaru;
        this.pesanan = pesanan;
        this.next = null;
        this.prev = null;
    }

    void setprev(node lain) {
        this.prev = lain;
        lain.next = this;
    }

    void setnext(node lain) {
        this.next = lain;
        lain.prev = this;
    }
}

class linkedlist {

    node head;
    node tail;

    linkedlist() {
        this.head = null;
        this.tail = null;
    }

    void print() {
        node current = head;
        while (current != null) {
            System.out.print(current.data + " ");
            current = current.next;
        }
        System.out.println("");
    }

    void push(node baru) {
        if (head == null) {
            head = baru;
            tail = baru;
        } else {
            tail.setnext(baru);
            tail = baru;
        }
    }

    void insert(node baru) {
        if (head == null) {
            head = baru;
            tail = baru;
        } else if (baru.data <= head.data) {
            head.setprev(baru);
            head = baru;
        } else if (baru.data >= tail.data) {
            tail.setnext(baru);
            tail = baru;
        } else {
            node current = head;
            while (current != null) {
                if (current.data >= baru.data) {
                    node barunext = current;
                    node baruprev = current.prev;
                    baru.setnext(barunext);
                    baru.setprev(baruprev);
                    break;
                }
                current = current.next;

            }
        }

    }

    node find(int data) {
        node cur = head;
        while (cur != null) {
            if (cur.data == data) {
                System.out.println("ada");
                return cur;
            }
            cur = cur.next;
        }
        System.out.println("gak ketemu");
        return null;
    }

    void delete(node hapus) {
        node cur = head;
        while (cur != null) {
            if (cur.data == hapus.data) {
                System.out.println(hapus.data + " terhapusk");
                if (head == tail && head.data == hapus.data) {
                    head = null;
                    tail = null;
                } else if (hapus.data == head.data) {
                    head = head.next;
                    head.prev = null;
                } else if (hapus.data == tail.data) {
                    tail = tail.prev;
                    tail.next = null;
                } else {
                    node ha = hapus.prev;
                    node pus = hapus.next;
                    hapus = null;
                    ha.setnext(pus);
                }
                break;
            }
            cur = cur.next;
        }
        System.out.println("gaada yg kehapus..");
    }

    int jumlah() {
        node jumlah = head;
        int jml = 0;
        while (jumlah != null) {
            jml++;
            jumlah = jumlah.next;
        }
        return jml;
    }

    public node qpop() { // 5 orang
        // TODO: write the code, pop node (queue), return it
        if (head == null) {
            System.out.println("LinkedList Kosong");
            return null;
        } else if (head == tail) {
            node temp = head;
            head = null;
            tail = null;
            return temp;
        } else {
            node temp = head;
            head = head.next;
            head.prev = null;
            temp.next = null;
            return temp;
        }
    }

    public node spop() { // 5 orang
        if (head == tail) {
            node temp = tail;
            tail = null;
            head = null;
            return temp;
        } else if (tail == null) {
            System.out.println("LinkedList Kosong");
            return null;
        } else {
            node temp = tail;
            tail = tail.prev;
            tail.next = null;
            temp.prev = null;
            return temp;
        }
    }
}

public class Aplikasi_preorder_hp {

    public static void main(String[] args) {
        linkedlist a = new linkedlist();
        linkedlist pelanggan = new linkedlist();
        linkedlist hitam = new linkedlist();
        linkedlist putih = new linkedlist();
        System.out.println("APLIKASI PREORDER OPPO F4s");
        int pilihan = 0;
        int input;
        int htm = 0;
        int pth = 0;
        int jumlahhtm = 0;
        int jumlahpth = 0;
        int total = 0;
        int htmterjual = 0, pthterjual = 0;

        do {
            System.out.println("1.stock barang");
            System.out.println("2.pemesanan");
            System.out.println("3.pembayaran");
            System.out.println("4.laporan");
            System.out.println("5.keluar");
            System.out.print("masukan pilihan > ");
            pilihan = new Scanner(System.in).nextInt();
            System.out.println("");
            if (pilihan == 1) {
                do {
                    System.out.println("1.tambah stok warna hitam");
                    System.out.println("2.tambah stok warna putih");
                    System.out.println("3.cek stock");
                    System.out.println("0.kembali");
                    System.out.print("masukan pilihan >");
                    pilihan = new Scanner(System.in).nextInt();
                    System.out.println("");
                    if (pilihan == 1) {
                        System.out.print("tambah berapa? > ");
                        input = new Scanner(System.in).nextInt();
                        for (int i = htm; i < input + htm; i++) {
                            String kode = "htm" + jumlahhtm;
                            hitam.push(new node(i, kode, null));
                        }
                    }
                    if (pilihan == 2) {
                        System.out.print("tambah berapa? > ");
                        input = new Scanner(System.in).nextInt();
                        for (int i = pth; i < input + pth; i++) {
                            String kode = "pth" + jumlahpth;
                            putih.push(new node(i, kode, null));
                        }
                    }
                    if (pilihan == 3) {
                        System.out.println("jumlah OPPO F4s hitam > " + hitam.jumlah());
                        System.out.println("jumlah OPPO F4s putih > " + putih.jumlah());
                    }
                } while (pilihan != 0);
            }


            if (pilihan == 2) {
                int pesanhtm = htm;
                int pesanpth = pth;
                do {
                    System.out.println("1.pesan");
                    System.out.println("0.kembali");
                    System.out.print("masukan pilihan > ");
                    pilihan = new Scanner(System.in).nextInt();
                    System.out.println("");
                    if (pilihan == 1) {
                        System.out.print("masukan nama pelanggan > ");
                        String nama = new Scanner(System.in).next();
                        System.out.print("warna hp yang dibeli > ");
                        String warna = new Scanner(System.in).next();
                        if (warna.equalsIgnoreCase("hitam")) {
                            if (hitam.head == null) {
                                System.out.println("maaf stock habis");
                            } else {
                                pelanggan.push(new node(htm + jumlahhtm, nama, hitam.spop()));
                                htm--;
                            }
                        } else if (warna.equalsIgnoreCase("putih")) {
                            if (putih.head == null) {
                                System.out.println("maaf stock habis");
                            } else {
                                pelanggan.push(new node(pth + jumlahpth, nama, putih.spop()));
                                pth--;
                            }
                        } else {
                            System.out.println("maaf warna tidak ada");
                        }
                        node v=null;
                        node gga=new node(2,"kk",v);
                    }
                } while (pilihan != 0);
            }
            if (pilihan == 3) {
                do {
                    System.out.println("1.pembayaran");
                    System.out.println("0.kembali");
                    System.out.print("masukan pilihan > ");
                    pilihan = new Scanner(System.in).nextInt();
                    System.out.println("");
                    if (pilihan == 1) {
                        int hitung;
                        node bayar = pelanggan.qpop();
                        if (bayar == null) {
                            System.out.println("belum ada yang pesan");
                            System.out.println("");
                            break;
                        }

                        System.out.println("nama  > " + bayar.nama);
                        System.out.println("beli  > OPPO F4s");
                        System.out.println("kode  > " + bayar.pesanan.nama);
                        if (bayar.pesanan.nama.contains("htm")) {
                            System.out.println("warna > hitam");
                            System.out.println("harga > Rp.1.500.000,-");
                            do {
                                System.out.println("jumlah uang yang dibayar >");
                                hitung = new Scanner(System.in).nextInt();
                                if (hitung < 1500000) {
                                    System.out.println("maaf uang kurang");
                                } else {
                                    System.out.println("kembali > Rp." + (hitung - 1500000) + ",-");
                                }
                            } while (hitung < 1500000);
                            total = total + 1500000;
                            htmterjual++;
                        } else {
                            System.out.println("warna > putih");
                            System.out.println("harga > Rp.2.000.000,-");
                            do {
                                System.out.println("jumlah uang yang dibayar >");
                                hitung = new Scanner(System.in).nextInt();
                                if (hitung < 2000000) {
                                    System.out.println("maaf uang kurang");
                                } else {
                                    System.out.println("kembali > Rp." + (hitung - 2000000) + ",-");
                                }
                            } while (hitung < 2000000);
                            total = total + 2000000;
                            pthterjual++;
                        }


                    }
                } while (pilihan != 0);
            }

            if (pilihan == 4) {
                System.out.println("jumlah OPPO F4s terjual :");
                System.out.println("warna hitam > " + htmterjual);
                System.out.println("warna putih > " + pthterjual);
                System.out.println("jumlah pemasukan > Rp." + total + ",-");
                pilihan = 0;
                System.out.println("");
            }
        } while (pilihan != 5);
    }
}