public class MyBCAEncapsulation {

    // =========================
    // CLASS REKENING (ENCAPSULATION)
    // =========================
    static class Rekening {
        private String namaNasabah;
        private String nomorRekening;
        private double saldo;

        // constructor
        public Rekening(String namaNasabah, String nomorRekening, double saldoAwal) {
            this.namaNasabah = namaNasabah;
            this.nomorRekening = nomorRekening;
            this.saldo = saldoAwal;
        }

        // getter
        public String getNamaNasabah() {
            return namaNasabah;
        }

        public String getNomorRekening() {
            return nomorRekening;
        }

        public double getSaldo() {
            return saldo;
        }

        // setter dengan validasi
        public void setNamaNasabah(String namaNasabah) {
            if (namaNasabah != null && !namaNasabah.isEmpty()) {
                this.namaNasabah = namaNasabah;
            } else {
                System.out.println("Nama tidak valid!");
            }
        }

        // BUSINESS PROCESS 1: SETOR
        public void setor(double jumlah) {
            if (jumlah > 0) {
                saldo += jumlah;
                System.out.println("Setor berhasil sebesar: " + jumlah);
            } else {
                System.out.println("Setor gagal! Jumlah tidak valid.");
            }
        }

        // BUSINESS PROCESS 2: TARIK
        public void tarik(double jumlah) {
            if (jumlah > 0 && jumlah <= saldo) {
                saldo -= jumlah;
                System.out.println("Tarik berhasil sebesar: " + jumlah);
            } else {
                System.out.println("Tarik gagal! Saldo tidak cukup / jumlah salah.");
            }
        }

        // BUSINESS PROCESS 3: CEK SALDO
        public void cekSaldo() {
            System.out.println("Saldo saat ini: " + saldo);
        }
    }

    // =========================
    // MAIN PROGRAM
    // =========================
    public static void main(String[] args) {

        // Membuat objek rekening
        Rekening rek = new Rekening("Andi", "123456789", 1000000);

        System.out.println("=== APLIKASI myBCA (ENCAPSULATION) ===");

        // =========================
        // BUSINESS PROCESS: CEK DATA AWAL
        // =========================
        System.out.println("\nData Nasabah:");
        System.out.println("Nama: " + rek.getNamaNasabah());
        System.out.println("No Rekening: " + rek.getNomorRekening());
        rek.cekSaldo();

        // =========================
        // BUSINESS PROCESS: SETOR
        // =========================
        System.out.println("\n-- Proses Setor --");
        rek.setor(500000);
        rek.cekSaldo();

        // =========================
        // BUSINESS PROCESS: TARIK
        // =========================
        System.out.println("\n-- Proses Tarik --");
        rek.tarik(300000);
        rek.cekSaldo();

        // =========================
        // BUSINESS PROCESS: TARIK GAGAL
        // =========================
        System.out.println("\n-- Proses Tarik Gagal --");
        rek.tarik(2000000); // saldo tidak cukup
        rek.cekSaldo();

        // =========================
        // BUSINESS PROCESS: UBAH NAMA
        // =========================
        System.out.println("\n-- Ubah Nama Nasabah --");
        rek.setNamaNasabah("Andi Wijaya");
        System.out.println("Nama baru: " + rek.getNamaNasabah());
    }
}