/**
 * Student.
 */
public class Student {

    private int absences = 0;
    private String name;
    private String address;

    @Override
    public boolean equals(Object o){
        if(o == this){
            return true;
        }
        if(!(o instanceof Student)){
           return false;
        }

        Student other = (Student) o;
        return name == other.name && address == other.address;
    }

    @Override
    public int hashCode(){
        int result = 7;
        result = 31 * result + Double.valueOf(name.length()).hashCode();
        result = 31 * result + Double.valueOf(address.length()).hashCode();
        return result;
    }

    /**
     * Constructor for class Student
     *
     * @param name name of the student
     * @param address address of the student
     * @throws IllegalArgumentException if name or address are empty
     */
    public Student(String name, String address) {
        if (name == null || name.isEmpty()) throw new IllegalArgumentException("name");
        if (address == null || address.isEmpty()) throw new IllegalArgumentException("address");
        this.name = name;
        this.address = address;
    }

    /**
     * Add absence.
     *
     * @param hourse absence in hours
     * @throws IllegalArgumentException if hours is <= 0
     */
    public void addAbsence(int hours){
        if(hours <= 0)throw new IllegalArgumentException("hours <= 0");
        this.absences += hours;
    }

    /**
     * @return absence (in hours)
     */
    public int getAbsences(){
        return absences;
    }

    /**
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * @return address
     */
    public String getAddress() {
        return address;
    }

    @Override
    public String toString(){
        return name + " /" + address + "/: " + absences;
    }
}