@Entity
public class Employee {
	@Id
	private Integer id;
	private String firstName;
	private String lastName;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public FullName getFullName() {
	    return new FullName(firstName, lastName);
	}

	public void setFullName(FullName fullName) {
		firstName = fullName.getFirstName();
		lastName = fullName.getLastName();
	}
}

public class FullName {
	private final String firstName;
	private final String lastName;
	
	public FullName(String fisrtName, String lastName) {
		this.firstName = firstName;
		this.lastName = lastName;
	}

	public String getFirstName() {
		return firstName;
	}

	public String getLastName() {
		return lastName;
	}
}