KRS.java

import java.util.ArrayList;

public class KRS {
    private ArrayList<MataKuliah> daftarMataKuliah = new ArrayList<>();
    private static final int MaksimalKredit = 12;

    public boolean tambahMataKuliah(MataKuliah mataKuliah) {
        int totalKredit = hitungTotalKredit();
        if (totalKredit + mataKuliah.getKredit() <= MaksimalKredit) {
            daftarMataKuliah.add(mataKuliah);
            return true;
        }
        return false;
    }

    public boolean hapusMataKuliah(String kode) {
        return daftarMataKuliah.removeIf(mk -> mk.getKode().equals(kode));
    }

    public int hitungTotalKredit() {
        return daftarMataKuliah.stream().mapToInt(MataKuliah::getKredit).sum();
    }

    public ArrayList<MataKuliah> getDaftarMataKuliah() {
        return daftarMataKuliah;
    }

    public boolean isKreditValid() {
        int totalKredit = hitungTotalKredit();
        return totalKredit <= MaksimalKredit;
    }
}