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LatihanMobilOverloading.java

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+public class LatihanMobilOverloading {
+
+    // =========================
+    // CLASS MOBIL
+    // =========================
+    static class Mobil {
+        String merk;
+        String warna;
+        int tahun;
+
+        // Constructor 1: tanpa parameter
+        Mobil() {
+            this.merk = "Unknown";
+            this.warna = "Unknown";
+            this.tahun = 0;
+        }
+
+        // Constructor 2: hanya merk
+        Mobil(String merk) {
+            this.merk = merk;
+            this.warna = "Unknown";
+            this.tahun = 0;
+        }
+
+        // Constructor 3: semua atribut
+        Mobil(String merk, String warna, int tahun) {
+            this.merk = merk;
+            this.warna = warna;
+            this.tahun = tahun;
+        }
+
+        // Method tampilkan spesifikasi
+        void tampilkanSpesifikasi() {
+            System.out.println("=== SPESIFIKASI MOBIL ===");
+            System.out.println("Merk  : " + merk);
+            System.out.println("Warna : " + warna);
+            System.out.println("Tahun : " + tahun);
+            System.out.println();
+        }
+    }
+
+    // =========================
+    // MAIN
+    // =========================
+    public static void main(String[] args) {
+
+        // Object 1: tanpa parameter
+        Mobil mobil1 = new Mobil();
+
+        // Object 2: hanya merk
+        Mobil mobil2 = new Mobil("Toyota");
+
+        // Object 3: semua atribut
+        Mobil mobil3 = new Mobil("Honda Civic", "Merah", 2023);
+
+        // Tampilkan spesifikasi
+        mobil1.tampilkanSpesifikasi();
+        mobil2.tampilkanSpesifikasi();
+        mobil3.tampilkanSpesifikasi();
+    }
+}

Main.java

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+class Saldo {
+    public static void main(String[] args) {
+        String metodePembayaran = "BI-FAST";
+        double saldo = 100_000;
+        double nominalTransfer = 200_000;
+
+        //Potong biaya admin dulu
+        switch(metodePembayaran) {
+            case "BI-FAST":
+                saldo -= 0; //Promo BI-FAST gratis
+                break;
+            case "RTOL":
+                saldo -= 6500; //Transfer online biasa
+                break;
+        }
+
+        //proses transfernya
+        if (saldo <nominalTransfer) {
+            System.out.println("Trx gagal: saldo tidak cukup!"):
+    } else
+            saldo -= nominalTransfer;
+        System.out.println("Trx berhasil! sisa saldo: " + saldo);
+    }
+}

MyBCAEncapsulation.java

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+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());
+    }
+}

Saldo.java

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+class Saldo {
+    public static void main(String[] args) {
+        String metodePembayaran = "BI-FAST";
+        double saldo = 100_000;
+        double nominalTransfer = 200_000;
+
+        //Potong biaya admin dulu
+        switch(metodePembayaran) {
+            case "BI-FAST":
+                saldo -= 0; //Promo BI-FAST gratis
+                break;
+            case "RTOL":
+                saldo -= 6500; //Transfer online biasa
+                break;
+        }
+
+        //proses transfernya
+        if (saldo <nominalTransfer) {
+            System.out.println("Trx gagal: saldo tidak cukup!"):
+    } else
+            saldo -= nominalTransfer;
+        System.out.println("Trx berhasil! sisa saldo: " + saldo);
+    }
+}

daftarkelas.java

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+class PendaftaranKelas {
+    static int kuotaTerisi = 0;
+    final static int MAX_KUOTA = 25;
+    String namaMhs;
+
+    PendaftaranKelas(String nama) {
+        this.namaMhs = nama;
+    }
+
+    void prosesDaftar() {
+        if (kuotaTerisi < MAX_KUOTA) {
+            kuotaTerisi++;
+            System.out.printf("%s -> BERHASIL MASUK KELAS A (Terisi: %d)\n", this.namaMhs, kuotaTerisi);
+        } else {
+            System.out.printf("%s -> GAGAL! KELAS PENUH, TERLEMPAR KE KELAS B\n", this.namaMhs);
+        }
+    }
+}
+
+public class daftarkelas {
+    public static void main(String[] args) {
+        System.out.println("LIRS KELAS PBO DIMULAI!\n");
+
+        for (int i = 1; i <= 26; i++) {
+            PendaftaranKelas mhsBaru =
+                new PendaftaranKelas(String.format("Mahasiswa %02d", i));
+            mhsBaru.prosesDaftar();
+        }
+    }
+}