javasample

public class Customer {
   private String name;
   private String email;
   private String company;

   public Customer(String name) {
       this(name, "", "");
   }

   public Customer(String name, String email) {
       this(name, email, "");
   }

   public Customer(String name, String email, String company) {
       this.name = name;
       this.email = email;
       this.company = company;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getEmail() {
       return email;
   }

   public void setEmail(String email) {
       this.email = email;
   }

   public String getCompany() {
       return company;
   }

   public void setCompany(String company) {
       this.company = company;
   }

   @Override
   public boolean equals(Object o) {
       if (this == o) return true;
       if (o == null || getClass() != o.getClass()) return false;

       Customer customer = (Customer) o;

       if (name != null ? !name.equals(customer.name) : customer.name != null) return false;
       if (email != null ? !email.equals(customer.email) : customer.email != null) return false;
       return company != null ? company.equals(customer.company) : customer.company == null;
   }

   @Override
   public int hashCode() {
       int result = name != null ? name.hashCode() : 0;
       result = 31 * result + (email != null ? email.hashCode() : 0);
       result = 31 * result + (company != null ? company.hashCode() : 0);
       return result;
   }

   @Override
   public String toString() {
       return "Customer{" +
               "name='" + name + '\'' +
               ", email='" + email + '\'' +
               ", company='" + company + '\'' +
               '}';
   }
}

/*
Kotlin alternative

data class Customer(var name: String, var email: String = "",
                    var company: String = "")

*/