Movie.java

public class Movie {

    private final String title;
    private int availableCopies = 1;
    private List<Member> onLoanTo = new ArrayList<>();

    public Movie(String title){
        this.title = title;
    }

    public void borrowCopy(Member member){
        availableCopies -= 1;
        onLoanTo.add(member);
    }

    public void returnCopy(Member member){
        availableCopies++;
        onLoanTo.remove(member);
    }

    public String getTitle() {
        return title;
    }

    public int getAvailableCopies() {
        return availableCopies;
    }

    public Boolean isOnLoanTo(Member member) {
        return onLoanTo.contains(member);
    }
}