Contact.java

import java.util.Objects;

public class Contact {
    private String contactId;
    private String firstName;
    private String lastName;
    private String phone;
    private String address;

    public Contact(String contactId, String firstName, String lastName, String phone, String address) {
        this.contactId = contactId;
        this.firstName = firstName;
        this.lastName = lastName;
        this.phone = phone;
        this.address = address;
    }

    public String getContactId() {
        return contactId;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        Contact other = (Contact) obj;
        return Objects.equals(contactId, other.contactId)
                && Objects.equals(firstName, other.firstName)
                && Objects.equals(lastName, other.lastName)
                && Objects.equals(phone, other.phone)
                && Objects.equals(address, other.address);
    }

    @Override
    public int hashCode() {
        return Objects.hash(contactId, firstName, lastName, phone, address);
    }
}