ubmart

 Scanner scan = new Scanner(System.in);
        int frekuensiBeli = 0;
        float subtotal2 = 0;
        int total = 0;
        float[] total_harga_2 = new float[100];
        while(true) {
            //buat menu awal
            System.out.println("selamat datang di ub mart".toUpperCase());
            System.out.println("Menu : ");
            System.out.println("1. Berbelanja");
            System.out.println("2. Lihat History");
            System.out.println("3. Keluar");
            System.out.print("Pilihan anda: ");
            int pilihan = scan.nextInt();
            System.out.println();
            if (pilihan == 1) {
                System.out.printf("%-40s %13s", "Masukkan banyak barang yang ingin dibeli", ": ");
                int jml_barang = scan.nextInt();
                int jumlahBarang1 = 0;
                int totalJumlahBarang = 0;
                float hargaBarang1 = 0;
                float totalHargaBarang = 0;
                float diskon = 0;
                float ppn = 0;
                String nama = "";
                String nim = "";
                String hari = "";
                scan.nextLine();
                //inisiasi array
                int[] jml_barang_array = new int[jml_barang];
                String[] nama_barang_array = new String[jml_barang];
                int[] jumlah_satuan_barang_array = new int[jml_barang];
                float[] harga_barang_unit_array = new float[jml_barang];
                float[] total_harga_array = new float[jml_barang];

                //input
                for (int a = 0; a < jml_barang_array.length; a++) {
                    System.out.printf("%-40s %13s", "Masukkan nama barang " + (a+1), " : ");
                    nama_barang_array[a] = scan.nextLine();
                    System.out.printf("%-40s %13s", "Masukkan jumlah barang " + (a+1), " : ");
                    jumlah_satuan_barang_array[a] = scan.nextInt();
                    totalJumlahBarang += jumlahBarang1;
                    System.out.printf("%-40s %13s", "Masukkan harga barang " + (a+1), " : ");
                    harga_barang_unit_array[a] = scan.nextFloat();
                    total_harga_array[a] = jumlah_satuan_barang_array[a] * harga_barang_unit_array[a];
                    totalHargaBarang += total_harga_array[a];
                    scan.nextLine();
                }
                System.out.println();
                System.out.printf("%-40s %13s", "Masukkan hari sekarang", ": ");
                hari = scan.nextLine();
                System.out.printf("%-40s %13s", "Apakah anda mahasiswa UB (true/false)", ": ");
                boolean status = scan.nextBoolean();
                scan.nextLine();
                //status mahasiswa atau bukan
                if (status) {
                    System.out.printf("%-40s %13s", "Masukkan User ID (NIM)", ": ");
                    nim = scan.nextLine();
                    System.out.printf("%-40s %13s", "Masukkan nama pembeli", ": ");
                    nama = scan.nextLine();
                    System.out.println();
                    System.out.println("===============================" + " Struk Pembelian " + "=====================================\n");
                    //SNMPTN
                    if (nim.substring(5, 9).equals("0701")) {
                        if (hari.equalsIgnoreCase("Senin") || hari.equalsIgnoreCase("Kamis")) {
                            System.out.println("Selamat, anda mendapatkan bonus diskon mahasiswa sebesar 10.00%");
                            diskon += 10.00f;
                        } else if (hari.equalsIgnoreCase("Minggu")) {
                            System.out.println("Selamat, anda mendapatkan bonus diskon mahasiswa sebesar 5.00%");
                            diskon += 5.00f;
                        }
                    }  //SBMPTN
                    else if (nim.substring(5, 9).equals("0700")) {
                        if (hari.equalsIgnoreCase("Selasa") || hari.equalsIgnoreCase("Jumat")) {
                            System.out.println("Selamat, anda mendapatkan bonus diskon mahasiswa sebesar 10.00%");
                            diskon += 10.00f;
                        } else if (hari.equalsIgnoreCase("Minggu")) {
                            System.out.println("Selamat, anda mendapatkan bonus diskon mahasiswa sebesar 5.00%");
                            diskon += 5.00f;
                        }
                    } //Mandiri
                    else if (nim.substring(5, 9).equals("0707")) {
                        if (hari.equalsIgnoreCase("Rabu") || hari.equalsIgnoreCase("Sabtu")) {
                            System.out.println("Selamat, anda mendapatkan bonus diskon mahasiswa sebesar 10.00%");
                            diskon += 10.00f;
                        } else if (hari.equalsIgnoreCase("Minggu")) {
                            System.out.println("Selamat, anda mendapatkan bonus diskon mahasiswa sebesar 5.00%");
                            diskon += 5.00f;
                        }
                    }
                    String kapital = hari.substring(0, 1);
                    String huruf1 = hari.substring(1).toLowerCase();
                    System.out.printf("%-10s %10s %-30s\n", "User ID", ":", nim);
                    System.out.printf("%-10s %10s %-30s\n", "Nama", ":", nama);
                    System.out.printf("%-10s %10s %-1s%-10s\n\n", "Hari", ":", kapital.toUpperCase(), huruf1);
                } else {
                    System.out.println();
                    System.out.println("===============================" + " Struk Pembelian " + "=====================================\n");
                }
                //output
                System.out.printf("%-10s\n", "-------------------------------------------------------------------------------------");
                System.out.printf("| %-2s | %-19s | %4s | %-25s | %-16s |\n", "No.", "Nama Barang", "Jumlah", "Harga/unit", "Total Harga");
                System.out.printf("%-10s\n", "-------------------------------------------------------------------------------------");
                for (int a = 0; a < jml_barang_array.length; a++) {
                    System.out.printf("| %3s | %-19s | %-6s | %3s %-,21.2f | %3s %-,12.2f |\n", "1.", nama_barang_array[a], jumlah_satuan_barang_array[a], "Rp.", harga_barang_unit_array[a], "Rp.", total_harga_array[a]);
                    System.out.printf("%-10s\n", "-------------------------------------------------------------------------------------");
                }
                ppn = totalHargaBarang / 10;
                float subtotal = totalHargaBarang + ppn;
                if (subtotal >= 100_000) {
                    diskon += 10.00f;
                } else if (subtotal >= 50_000 && subtotal < 100_000) {
                    diskon += 5.00f;
                }
                float diskonBelanja = diskon * subtotal / 100;
                subtotal2 = subtotal - diskonBelanja;
                System.out.printf("%36s | %-25s | %3s %-,12.2f | \n", " ", "PPN 10%", "Rp.", ppn);
                System.out.printf("%85s\n", "------------------------------------------------");
                System.out.printf("%36s | %-15s %6.2f%-2s | %3s %-,12.2f | \n", " ", "Diskon Belanja: ", diskon, "%", "Rp.", diskonBelanja);
                System.out.printf("%85s\n", "------------------------------------------------");
                System.out.printf("%36s | %-25s | %3s %-,12.2f | \n", " ", "Subtotal", "Rp.", subtotal2);
                System.out.printf("%85s\n", "------------------------------------------------");
                //agar data di array tidak ter-overwrite
                for (int a = total; ;a++){
                    total_harga_2[a] = subtotal2;
                    frekuensiBeli++;
                    total++;
                    break;
                }
            }
            //menampilkan history
            else if (pilihan == 2){
                if (frekuensiBeli == 0){
                    System.out.println("\nBelum ada transaksi\n");
                } else {
                    System.out.println("\nHistory Transaksi UB Mart\n");
                    System.out.println("--------------------------------------------------");
                    System.out.printf("| %-3s | %-19s | %-18s |\n", "No.", "Jenis transaksi", "Total Harga");
                    System.out.println("--------------------------------------------------");
                    for (int a = 0; a < frekuensiBeli; a++){
                        System.out.printf("| %-3s | %-19s | Rp. %-,14.2f |\n", (a+1) + ".", "Belanja", total_harga_2[a]);
                        System.out.println("--------------------------------------------------");
                    }
                    System.out.println();
                }
            }
            //keluar
            else if (pilihan == 3){
                System.exit(0);
            }
        }