Thread: Beginner - how to make .java file run!

Hi, I have worked on a java code for a class and have no idea how to make it work. It basically needs to grab info from a database and spit out a table. I have Netbeans, Postgresql, and this java file. What next to work online?

.java file:

//
//  File: client3.java
//
 
import java.sql.*;
 
public class client3
{
  public static void main( String args[] )
  {
    Class driverClass = loadDriver( "org.postgresql.Driver" );
 //   String  driver = "org.postgresql.Driver";
    String  url    = "jdbc:postgresql://site.com/?user=USERNAME&password=PASSWORD";
 
 
    if( driverClass == null )
      return;
 
 //   if( args.length != 1 )
//    {
//      System.err.println( "usage: java client3 <url>" );
//      return;
//    }
 
    Connection con = connectURL( url );
 
    if( con != null )
    {
      ResultSet result = execQuery( con, "SELECT * FROM kronke.inventory;" );
 
      if( result != null )
	printResults( result );
    }
  }
 
  static Class loadDriver( String driverName )
  {
    try 
    { 
      return( Class.forName( driverName ));
    }
    catch( ClassNotFoundException e )
    {
      System.err.println( "Can't load driver - " + e.getMessage());
      return( null );
    }
  }
 
  static Connection connectURL( String URL )
  {
    try
    {
      return( DriverManager.getConnection( URL ));
    }
    catch( SQLException e )
    {
      System.err.println( "Can't connect - " + e.getMessage());
      return( null );
    }
  }
 
  static ResultSet execQuery( Connection con, String query )
  {
    try
    {
      Statement stmt = con.createStatement();
 
      System.out.println( query );
 
      return( stmt.executeQuery( query ));
    }
    catch( SQLException e )
    {
      System.err.println( "Query failed - " + e.getMessage());
      return( null );
    }
  }
 
  static void printResults( ResultSet res )
  {
    System.out.println( " sku | department" );
    System.out.println( "---------+------------------------------" );
 
    try
    {
      while( res.next())
      {
        System.out.print( res.getString( 1 ));
	System.out.print( " | ");
	System.out.print( res.getString( 2 ));
	System.out.println( "" );
      }
    }
    catch( SQLException e )
    {
      System.err.println( "Fetch failed: " + e.getMessage());
    }
  }
}

Yeah, when I press run in Netbeans, nothing happens. I am not sure how to get the result and also how to run it online.