Why am I getting this error with my SQL statement

Hi,
I am getting an error with my JDBC program, for some reason or another I get the below error can someone tell me what I need to do to correct this. Thanks. The code is attached and the error is below

Welcome to JDBC program!
05/01/10
Error: Error retrieving data!
java.sql.SQLException: Operation not allowed after ResultSet closed
      at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1075)
      at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
      at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
      at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:929)
      at com.mysql.jdbc.ResultSetImpl.checkClosed(ResultSetImpl.java:794)
      at com.mysql.jdbc.ResultSetImpl.next(ResultSetImpl.java:7145)
      at JDBCApp.ConvertData(JDBCApp.java:62)
      at JDBCApp.main(JDBCApp.java:120)

import java.sql.*;


public class JDBCApp 
{
    Connection link;
    Statement statement =null;
    ResultSet results;
    String dbURL = "blahblah";
	String username = "blah";
	String password = "blah";
	int ID;
	String Date;
    
    /** Creates a new instance of JDBCApp */
    public JDBCApp() 
    {
    }
    public void Connect(){
    	   System.out.println("Welcome to JDBC program!");
           try 
           {
               Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
               link = DriverManager.getConnection(dbURL,username,password);
   	}
   	catch(ClassNotFoundException e)
   	{
   		System.out.println("Error: Unable to load driver!");
   		System.exit(1);
   	}
   	catch(SQLException e)
   	{
   		System.out.println("Error: Cannot connect to database!");
   		System.exit(1);
   	}
    }
    
    public void ConvertData(){
    	try
    	{
    		statement = link.createStatement();
    		results = statement.executeQuery("SELECT id,date FROM wind_data WHERE date LIKE '%2010'");
    	}
    	catch(SQLException e)
    	{
    		System.out.println("Error: Cannot execute query!");
    		e.printStackTrace();
    		System.exit(1);
    	}

    	try
    	{
    		while (results.next())
    		{
    			ID = (results.getInt("ID"));
    			Date = (results.getString("DATE"));
    			
    			String newdate = FormatDate(Date);
    			System.out.println(newdate);
    			
    			try
    			{
    				//statement = link.prepareStatement("UPDATE wind_data    SET date = '"+newdate+"'   WHERE ID = '"+ID+"'");
    				statement.executeUpdate("UPDATE wind_data    SET date = '"+newdate+"'   WHERE ID = '"+ID+"'"); 
    				//System.out.println("Getting Data");
    			}
    			catch(SQLException e)
    			{
    				System.out.println("Error: Cannot execute query!");
    				e.printStackTrace();
    				System.exit(1);
    			
    		}
    		}
    	}
    	catch(SQLException e)
    	{
    		System.out.println("Error: Error retrieving data!");
    		e.printStackTrace();
    		System.exit(1);
    	}
    }
    
    public void Disconnect(){
    	try
    	{
    		link.close();
    	}
    	catch(SQLException e)
    	{
    		System.out.println("Error: Unable to disconnect!");
    		e.printStackTrace();
    	}
    }
    
    public String FormatDate(String Date){
		String day = Date.substring(0, 2);
		String month = Date.substring(3,5);
		String year = Date.substring(8,10);
		String newdate = day+"/"+month+"/"+year;
		return newdate;
		
	}
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) 
    {
    	JDBCApp a = new JDBCApp();
     a.Connect();
     a.ConvertData();
     a.Disconnect();

	

	
    }
    
   
}

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