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Hello everyone,
someone can explain to me why the clone () method does not return an object identical to the original?
What is wrong?
Thanks for your patience
old_current = current.clone();
if(old_current.equals(current)==false)
{
try
{
Messagebox.show("errore");
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
public class Utenti implements Cloneable
{
private String utente;
private String passwd;
private String verifica;
private String tipo;
private String cognome;
private String nome;
private Boolean abilitato;
private java.sql.Timestamp data_cambio_passwd;
private java.sql.Timestamp data_abilitazione;
private java.sql.Timestamp data_disabilitazione;
private java.sql.Timestamp data_ultimo_login;
private java.sql.Timestamp data_inserimento;
private String login_inserimento;
private java.sql.Timestamp data_variazione;
private String login_variazione;
public Utenti clone() throws CloneNotSupportedException
{
Utenti ut = (Utenti) super.clone();
return ut;
}
....
Did you implement a meaningful .equals() in your class called "Utenti"? If not, .equals() is derived from Object.class and compares simple object identity (same as objectA == objectB) which is false for an object and it's clone by design.
Cheers, Maik
Hi Maik, I have write this code in my class
....
@Override public boolean equals(Object obj)
{
if (this == obj) return true;
if (!(obj instanceof Utenti)) return false;
Utenti ut = (Utenti)obj;
return UtilityVarie.confrontaOggetti.uguale(this.abilitato, ut.abilitato)
&& UtilityVarie.confrontaOggetti.uguale(this.cognome, ut.cognome)
&& UtilityVarie.confrontaOggetti.uguale(this.data_abilitazione, ut.data_abilitazione)
&& UtilityVarie.confrontaOggetti.uguale(this.data_cambio_passwd, ut.data_cambio_passwd)
&& UtilityVarie.confrontaOggetti.uguale(this.data_disabilitazione, ut.data_disabilitazione)
&& UtilityVarie.confrontaOggetti.uguale(this.data_inserimento, ut.data_inserimento)
&& UtilityVarie.confrontaOggetti.uguale(this.data_ultimo_login, ut.data_ultimo_login)
&& UtilityVarie.confrontaOggetti.uguale(this.data_variazione, ut.data_variazione)
&& UtilityVarie.confrontaOggetti.uguale(this.login_inserimento, ut.login_inserimento)
&& UtilityVarie.confrontaOggetti.uguale(this.login_variazione, ut.login_variazione)
&& UtilityVarie.confrontaOggetti.uguale(this.nome, ut.nome)
&& UtilityVarie.confrontaOggetti.uguale(this.passwd, ut.passwd)
&& UtilityVarie.confrontaOggetti.uguale(this.tipo, ut.tipo)
&& UtilityVarie.confrontaOggetti.uguale(this.utente, ut.utente)
&& UtilityVarie.confrontaOggetti.uguale(this.verifica, ut.verifica);
}
and this....
public static class confrontaOggetti
{
public static boolean uguale(String a, String b)
{
return a==b;
}
public static boolean uguale(Boolean a, Boolean b)
{
return a=b;
}
public static boolean uguale(java.sql.Timestamp a, java.sql.Timestamp b)
{
return a == null ? b == null : a.equals(b);
}
public static boolean uguale(Object a, Object b)
{
return a == null ? b == null : a.equals(b);
}
}Some fields (only those defined Timestamp) changed during this operation:
private List<Utenti> thelist;
private Utenti current, old_current;
public void refreshUi()
{
UtentiDAO pdao = (UtentiDAO)SpringUtil.getBean("UtentiDAO");
Tabbox tbox = (Tabbox)getFellow("tbox");
tbox.setSelectedIndex(0);
thelist = pdao.findAll();
if (thelist.isEmpty() == false )
setCurrent(thelist.iterator().next()); <<<------------ !!!!!! Here the problem.......
binder.loadAll();
}
public void setCurrent(Utenti cur)
{
this.current= cur;
}
The problem is that some fields (Timestamp) are included in the List with the milliseconds and are not in the database.
Example:
Field before RefreshUI: 08/12/2010 08:47:03.0
Same field after: 08/12/2010 08:47:03.557
It 's a problem of casting? It 's a problem JdbcTemplate? It 's a problem with my program?
Thanks
Asked: 2010-12-08 11:42:57 +0800
Seen: 130 times
Last updated: Dec 09 '10