Question

I have a form that let user enter values about address information.
I want to compare the values I get from user, with information stored into ADDRESS table in the database.
I have an entity class

public class Address {
  private String gevernate;
  private int homeNo;
  private String neighborhood;
  private String street;
} 

which is represented as a table in the database called ADDRESS.

and I have a view object for this class which return all address values from db tabel

public static Address getAddress(Connection Con, long stdID) {
// select stamatment and result set object.
}

The problem I face is that the form may NOT contain all values of Address object, it may contains only 2 or three values, it’s specified at run time. How can I compare two objects ?

Answer 1

add an equals method to the class like this:

public class Address {
    private String gevernate;
    private int homeNo;
    private String neighborhood;
    private String street;

public boolean equals(Object obj) {
    if (this == obj)
        return true;
    if (obj == null)
        return false;
    if (getClass() != obj.getClass())
        return false;
    Address other = (Address) obj;
    if (gevernate == null) {
        if (other.gevernate != null)
            return false;
    } else if (!gevernate.equals(other.gevernate))
        return false;
    if (homeNo != other.homeNo)
        return false;
    if (neighborhood == null) {
        if (other.neighborhood != null)
            return false;
    } else if (!neighborhood.equals(other.neighborhood))
        return false;
    if (street == null) {
        if (other.street != null)
            return false;
    } else if (!street.equals(other.street))
        return false;
    return true;
}
}