unnecessary cast?

[Tim Nachreiner]

In line 2, why is there a cast on method rs.getMetaData() when the return type is already a ResultSetMetaData type?
The code ran fine when I removed the cast, so I'm wondering if there is an 'advanced' reason for the cast.

 public static DefaultTableModel myTableModel(ResultSet rs) throws SQLException {
ResultSetMetaData metadata = (ResultSetMetaData) rs.getMetaData();
int columnsCount = metadata.getColumnCount();
Vector<String> columnNames = new Vector<String>();
for (int i = 1; i < columnsCount; i++) {
columnNames.add(metadata.getColumnName(i));
}
Vector<Object> data = new Vector<Object>();
while (rs.next()) {
Vector<Object> eachLine = new Vector<Object>();
for (int i = 1; i < columnsCount; i++) {
eachLine.add(rs.getObject(i));
}
data.add(eachLine);
}
return new DefaultTableModel(data, columnNames);
}

[Balagopal Kannampallil]

Hi Tim,

I think the cast is not necessary.

Where did you get this code from? Is the author using a specific jdk version?

[Winston Gutkowski]

 

Tim Nachreiner wrote:The code ran fine when I removed the cast, so I'm wondering if there is an 'advanced' reason for the cast...

Nope. Indeed, the docs for the class specifically show an example without one.

Winston

[Tim Nachreiner]

 

Balagopal Kannampallil wrote:

Where did you get this code from? Is the author using a specific jdk version?

Most of my sample code for JTable comes from Oracle's jdk6 site. I'm not 100% sure that's where this came from.

[Balagopal Kannampallil]

No worries!!
I was curious to know where this piece of code came from.