"Cannot Find Symbol" when I trying Vector to ArrayList

amansundar · #1 (**permalink**) 10-12-2007, 12:22 AM

I am changing from Vectors to use Arraylists with the new generics arraylists.

My original code to read an SQL table and save the rows into a Vector:

Code:

private Vector llenaVectorConceptos(Vector VectorConceptos) {
ResultSet rs=null;
Vector vectorConceptos = new Vector(); 
try{
rs=stmt.executeQuery("Select * from Conceptos order by CONCEPTODESCRIPCION");
while(rs.next())
{
vectorConceptos.add(rs.getString("CONCEPTODESCRIPCION") + " > " + rs.getString("TIPO") + " > " + rs.getString("NUMCONCEPTO"));
}
}
catch(SQLException e){
System.out.println(e);
}
mdbc.close(rs);
return vectorConceptos; 
}

the problem is that i want to change these vectors just to use arraylists.
See the new code:

Code:

private ArraList llenaVectorConceptos(ArraList VectorConceptos) {
ResultSet rs=null;
ArraList<String> vectorConceptos = new ArraList<String>(); 
try{
rs=stmt.executeQuery("Select * from Conceptos order by CONCEPTODESCRIPCION");
while(rs.next())
{
vectorConceptos.add(rs.getString("CONCEPTODESCRIPCION"), rs.getString("TIPO"));
}
}
catch(SQLException e){
System.out.println(e);
}
mdbc.close(rs);
return vectorConceptos; 
}

During compilation appears this message : "Cannot Find Symbol" in the

Code:

vectorConceptos.add(rs.getString("CONCEPTODESCRIPCION"), rs.getString("TIPO"));

Netbeans compiling output :

symbol : method add(java.lang.String,java.lang.String)
location: class java.util.ArrayList<java.lang.String>
vectorConceptos.add(rs.getString("CONCEPTODESCRIPC ION"), rs.getString("TIPO"));

Is any Idea?

latchu · #2 (**permalink**) 11-20-2007, 01:47 AM

mm…fine…

I think i found the problem. the .add method for the arraylist only accept (1) value, i am trying to enter (2) values:

vectorConceptos.add(rs.getString("CONCEPTODESCRIPC ION"), rs.getString("TIPO"));

When i change the statement to :
vectorConceptos.add(rs.getString("CONCEPTODESCRIPC ION"));
the compilation message disappears.
But now i have a new problem after changing this, I need an array with two columns, i mean, 1st column to hold the "CONCEPTODESCRIPCION" and a 2nd column to hold the "TIPO".

Can it be possible using this kind of arraylis or i need another arraylist?

Some example?

Thanks again...

S.Vinothkumar · #3 (**permalink**) 11-28-2007, 02:18 AM

Hi
You've changed Vector to ArrayList ok.

It looks like you are also trying to change what you store in your collection.
Previously you were storing a single String, now you want to store a more complex collection of information. You have a variety of options. One simple option is to use a String array.

Code:

ArrayList<String[]> vectorConceptos = new ArrayList<String[]>();
vectorConceptos.add(new String[] {rs.getString("CONCEPTODESCRIPCION"), rs.getString("TIPO")});

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