JList

[Pelle Henriksson]

Hi !!

Can someone please help me with this:
I store objects in a Vector, and then i store the Vector in a file, here is that object:

import java.io.*;
import java.util.*;

public class tblQuery implements Serializable {
public String fldSuggestionTitle = null;
public String fldSuggestionText = null;
public Date fldSuggestionDate = null;
public int fldUserID;

}

I would like to display these objects in a JList but only fldSuggestionTitle and then fldUserID as a hidden value,
db is my vector with the tblQury objects. I dont understand how to hide an id and only show the title.

private void test() {
m = new DefaultListModel();

db = clsDBHandler.readData("tblQuery.dat");
for(int i =0; i < db.size(); i++){
qry = (tblQuery) db.elementAt(i);
m.addElement(qry.fldSuggestionTitle);

}
JList lstQuery = new JList(m);
lstQuery.setBounds(10,10,100,100);
getContentPane().add(lstQuery);
}


This one fetches the vector from file.

import java.io.*;
import java.util.*;

public class clsDBHandler {

public static Vector readData(String strFile) {
Vector db = null;

try {
ObjectInputStream in = new ObjectInputStream(new FileInputStream(strFile));
db = (Vector) in.readObject();
in.close();
}

catch(FileNotFoundException e) {
db = new Vector();
}

catch(Exception e) {
}

finally {
return db;
}
}

Chees and thanx Pelle

[Paul Clapham]

You can put any object into a JList, not only Strings. Whatever object you use, the default behaviour of JList should be to display the result of its "toString()" method. So change your class to include a method "toString()" that returns fldSuggestionTitle, and add the objects directly to the JList.

PC2
Pelle Henriksson <pelle_henriksson@home.se> wrote in message news:3a067ee7@news.devx.com...
Hi !!

Can someone please help me with this:
I store objects in a Vector, and then i store the Vector in a file, here is that object:

...

I would like to display these objects in a JList but only fldSuggestionTitle and then fldUserID as a hidden value,
db is my vector with the tblQury objects. I dont understand how to hide an id and only show the title.

[Pelle Henriksson]

Thanx !!

How should that method be implemented?, I tried

public String toString() {

retutrn fldSuggestionTitle;

}

but then I got a nullpointerexcepiton, if I remove this method it works ok, but I get tblQuery@484234 in the list.
Do I need to change anything else in the class??

pelle
"Paul Clapham" <pclapham@core-mark
.com> wrote in message news:3a06d5ae$1@news.devx.com...
You can put any object into a JList, not only Strings. Whatever object you use, the default behaviour of JList should be to display the result of its "toString()" method. So change your class to include a method "toString()" that returns fldSuggestionTitle, and add the objects directly to the JList.

PC2
Pelle Henriksson <pelle_henriksson@home.se> wrote in message news:3a067ee7@news.devx.com...
Hi !!

Can someone please help me with this:
I store objects in a Vector, and then i store the Vector in a file, here is that object:

...

I would like to display these objects in a JList but only fldSuggestionTitle and then fldUserID as a hidden value,
db is my vector with the tblQury objects. I dont understand how to hide an id and only show the title.

[Paul Clapham]

Yes, that's the correct implementation. But you need to set fldSuggestionTitle to something other than null -- I didn't see any code in your original post that does that.

PC2
Pelle Henriksson <pelle_henriksson@home.se> wrote in message news:3a07dd74$1@news.devx.com...
Thanx !!

How should that method be implemented?, I tried

public String toString() {

retutrn fldSuggestionTitle;

}

but then I got a nullpointerexcepiton, if I remove this method it works ok, but I get tblQuery@484234 in the list.
Do I need to change anything else in the class??

pelle

[Madani]

the toString method should be in another meothd that take your object as an
argument and return a string

public String thismethod (fldSuggestionTitle f) {

return f.toString();

}









"Pelle Henriksson" <pelle_henriksson@home.se> wrote:
>This is a multi-part message in MIME format.
>
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>Content-Type: text/plain;
> charset="iso-8859-1"
>Content-Transfer-Encoding: quoted-printable
>
>Thanx !!
>
>How should that method be implemented?, I tried
>
>public String toString() {
>
> retutrn fldSuggestionTitle;
>
>}
>
>but then I got a nullpointerexcepiton, if I remove this method it works
=
>ok, but I get tblQuery@484234 in the list.
>Do I need to change anything else in the class??
>
>pelle
> "Paul Clapham" <pclapham@core-mark
> .com> wrote in message news:3a06d5ae$1@news.devx.com...
> You can put any object into a JList, not only Strings. Whatever =
>object you use, the default behaviour of JList should be to display the
=
>result of its "toString()" method. So change your class to include a =
>method "toString()" that returns fldSuggestionTitle, and add the objects
=
>directly to the JList.
>
> PC2
> Pelle Henriksson <pelle_henriksson@home.se> wrote in message =
>news:3a067ee7@news.devx.com...
> Hi !!
>
> Can someone please help me with this:
> I store objects in a Vector, and then i store the Vector in a file,
=
>here is that object:
>
> ...
>
> I would like to display these objects in a JList but only =
>fldSuggestionTitle and then fldUserID as a hidden value,
> db is my vector with the tblQury objects. I dont understand how to =
>hide an id and only show the title.
>
>
>------=_NextPart_000_0026_01C048B0.2D0AF270
>Content-Type: text/html;
> charset="iso-8859-1"
>Content-Transfer-Encoding: quoted-printable
>
><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
><HTML><HEAD>
><META content=3D"text/html; charset=3Diso-8859-1" =
>http-equiv=3DContent-Type>
><META content=3D"MSHTML 5.00.3103.1000" name=3DGENERATOR>
><STYLE></STYLE>
></HEAD>
><BODY bgColor=3D#ffffff>
><DIV><FONT face=3DArial size=3D2>Thanx !!</FONT></DIV>
><DIV>*</DIV>
><DIV><FONT face=3DArial size=3D2>How should that method be =
>implemented?,*I=20
>tried</FONT></DIV>
><DIV>*</DIV>
><DIV><FONT face=3DArial size=3D2>public String toString() {</FONT></DIV>
><DIV>*</DIV>
><DIV><FONT face=3DArial size=3D2>*** retutrn=20
>fldSuggestionTitle;</FONT></DIV>
><DIV>*</DIV>
><DIV><FONT face=3DArial size=3D2>}</FONT></DIV>
><DIV>*</DIV>
><DIV><FONT face=3DArial size=3D2>but then I got a nullpointerexcepiton,
=
>if*I=20
>remove this method it works ok, but*I get tblQuery@484234 in the=20
>list.</FONT></DIV>
><DIV><FONT face=3DArial size=3D2>Do I need to change anything else in =
>the=20
>class??</FONT></DIV>
><DIV>*</DIV>
><DIV><FONT face=3DArial size=3D2>pelle</FONT></DIV>
><BLOCKQUOTE=20
>style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT:
=
>0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
> <DIV>"Paul Clapham" <<A=20
> href=3D"mailtoclapham@core-mark.com">pclapham@core-mark</A></DIV>
> <DIV>.com> wrote in message <A=20
> =
>href=3D"news:3a06d5ae$1@news.devx.com">news:3a06d5ae$1@news.devx.com</A>.=
>...</DIV>
> <DIV><FONT face=3DArial size=3D2>You can put any object into a JList,
=
>not only=20
> Strings.* Whatever object you use, the default behaviour of JList =
>should=20
> be to display the result of its "toString()" method.* So change =
>your=20
> class to include a method "toString()" that returns =
>fldSuggestionTitle, and=20
> add the objects directly to the JList.</FONT></DIV>
> <DIV>*</DIV>
> <DIV><FONT face=3DArial size=3D2>PC2</FONT></DIV>
> <BLOCKQUOTE=20
> style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; =
>MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
> <DIV>Pelle Henriksson <<A=20
> =
>href=3D"mailtoelle_henriksson@home.se">pelle_henriksson@home.se</A>>=
>=20
> wrote in message <A=20
> =
>href=3D"news:3a067ee7@news.devx.com">news:3a067ee7@news.devx.com</A>...</=
>DIV>
> <DIV><FONT face=3DArial size=3D2>Hi !!</FONT></DIV>
> <DIV>*</DIV>
> <DIV><FONT face=3DArial size=3D2>Can someone please help me with=20
> this:</FONT></DIV>
> <DIV><FONT face=3DArial size=3D2>I store objects in a Vector, and =
>then i store=20
> the Vector in a file, here is that object:</FONT></DIV>
> <DIV>*</DIV>
> <DIV><FONT face=3D"Courier New" size=3D2>...</FONT></DIV>
> <DIV>*</DIV>
> <DIV><FONT face=3DArial size=3D2>I would like to display these =
>objects in a=20
> JList but only fldSuggestionTitle* and then fldUserID as a =
>hidden=20
> value,</FONT></DIV>
> <DIV><FONT face=3DArial size=3D2>db is my vector with the tblQury =
>objects. I=20
> dont understand how to hide an id and only show the =
>title.</FONT></DIV>
> <DIV>*</DIV>
> <DIV><FONT =
>size=3D2></DIV></BLOCKQUOTE></BLOCKQUOTE></FONT></BODY></HTML>
>
>------=_NextPart_000_0026_01C048B0.2D0AF270--
>