[unchecked] unchecked error message
I wanted to display data in a jtable and decided to use code from another forum. When I compile the code I get three warning messages:
"[unchecked] unchecked call to addElement(E)...."
These warning messages are for the lines of code that call the addElement method.
Here is the code:
import java.awt.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableFromDatabase extends JFrame
{
public TableFromDatabase()
{
Vector columnNames = new Vector();
Vector data = new Vector();
try
{
// Connect to the Database
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String url = "jdbc:odbc:moviesDSN"; // if using ODBC Data Source name
//String url = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=c:/teenergy.mdb";
String userid = "";
String password = "";
Class.forName( driver );
Connection connection = DriverManager.getConnection(url);
// Read data from a table
String sql = "Select * from Employees2";
Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery( sql );
ResultSetMetaData md = rs.getMetaData();
int columns = md.getColumnCount();
// Get column names
for (int i = 1; i <= columns; i++)
{
columnNames.addElement( md.getColumnName(i) );
}
// Get row data
while (rs.next())
{
Vector row = new Vector(columns);
for (int i = 1; i <= columns; i++)
{
row.addElement( rs.getObject(i) );
}
data.addElement( row );
}
rs.close();
stmt.close();
}
catch(Exception e)
{
System.out.println( e );
}
// Create table with database data
JTable table = new JTable(data, columnNames);
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
JPanel buttonPanel = new JPanel();
getContentPane().add( buttonPanel, BorderLayout.SOUTH );
}
@SuppressWarnings("unchecked") public static void main(String[] args)
{
TableFromDatabase frame = new TableFromDatabase();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
}
}
