Encapsulation

public class Main {
    public static void main(String[] args) {
        
        Mahasiswa mhs = new Mahasiswa("Riki Wahyudi", "123456789");

        System.out.println("=== Data Awal ===");
        System.out.println("Nama: " + mhs.getNama());
        System.out.println("NIM : " + mhs.getNim());
        System.out.println();

        mhs.setNama("Wahyudi Riki");
        mhs.setNim("987654321");

        System.out.println("=== Setelah Diubah ===");
        System.out.println("Nama: " + mhs.getNama());
        System.out.println("NIM : " + mhs.getNim());
        System.out.println();

    }
}

class Mahasiswa {
    private String nama;
    private String nim;

    public Mahasiswa(String nama, String nim) {
        this.nama = nama;
        this.nim = nim;
    }

    public void setNama(String nama) {
        this.nama = nama;
    }

    public void setNim(String nim) {
        this.nim = nim;
    }

    public String getNama() {
        return nama;
    }

    public String getNim() {
        return nim;
    }
}