INHERITANCE

package rs;
import java.util.Scanner;
public class Rs {
    String namaRs;
    Scanner str=new Scanner(System.in);
    public Scanner in=new Scanner(System.in);
    public void setNamaRs(){
        System.out.print("Masukkan Nama Rumah Sakit: ");
        this.namaRs=str.nextLine();
    }
    public static void main(String[] args) {
        int menu=0,a,z=0,ktp;
        Rs rumsa=new Rs();
        Pasien[] p=new Pasien[1024];
        while(menu!=4){
            System.out.print("1.input\n2.update\n3.view\n4.exit\npilihan : ");
            menu=rumsa.in.nextInt();
            if(menu==1){
                z++;
                p[z]=new Pasien();
                p[z].setData();
            }
            else if(menu==2){
                if(z<1)
                    System.out.println("data kosong");
                else{
                    System.out.print("masukkan ktp yang akan di edit : ");
                    ktp=rumsa.in.nextInt();
                    a=0;
                    while(a<z){
                        a++;
                        if(ktp==p[a].getKtp())
                            break;
                    }
                    if(a<=z){
                        p[a].tampil();
                        p[a].setData();
                    }else
                        System.out.println("data tidak ditemukan");
                }
            }
            else if(menu==3){
                if(z<1)
                    System.out.println("data kosong");
                else{
                    a=0;
                    while(a<z){
                        a++;
                        System.out.println("---"+a+"---");
                        p[a].tampil();
                    }
                }
            }
            else if(menu==4)
                System.out.println("keluar...");
            else
                System.out.println("menu ilegal");
        }
    }
}

class Pasien extends Rs{
    String nama,penyakit,noKamar;
    int ktp;
    public void setData(){
        this.setNamaRs();
        System.out.print("Masukkan Nomer KTP       : ");
        this.ktp=in.nextInt();
        System.out.print("Masukkan Nama Pasien     : ");
        this.nama=str.nextLine();
        System.out.print("Masukkan Penyakit Pasien : ");
        this.penyakit=str.nextLine();
        System.out.print("Masukkan nomer Kamar     : ");
        this.noKamar=str.nextLine();
    }
    public int getKtp(){
        return this.ktp;
    }
    public void tampil(){
        System.out.println("RUMAH SAKIT     : "+this.namaRs);
        System.out.println("Nomer KTP       : "+this.ktp);
        System.out.println("Nama Pasien     : "+this.nama);
        System.out.println("Penyakit Pasien : "+this.penyakit);
        System.out.println("nomer Kamar     : "+this.noKamar);
    }
}