We must download a mysql-connector-java-5.0.8-bin.jar and keep it to
C:Program FilesJavajdk1.6.0_01jrelibext

In java programming, before coding we must established a connection between interpreter and MySQL.

at first we must import some built in packages.they are:
[code]
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Connection;

//now finally in our main job i.e establishing the connection

Connection m_Connection = null;
Statement m_Statement = null;
ResultSet m_ResultSet = null;

String m_Driver ="com.mysql.jdbc.Driver";
String m_Url = "jdbc:mysql://localhost:3306/databasename";

//Loading driver
try {
Class.forName(m_Driver);
}
catch (ClassNotFoundException ex) {
ex.printStackTrace();
}

String query = "";
try {

//Create connection object
m_Connection = DriverManager.getConnection(m_Url, user, password);

//Create Statement object
m_Statement = m_Connection.createStatement();
query = "SELECT * FROM ";
query+=tablename;

//Execute the query
m_ResultSet = m_Statement.executeQuery(query);
String s,t="";

//Loop through the results
while (m_ResultSet.next()) {

s=m_ResultSet.getString(1); //here 1 means value of first coloumn

}//end for while loop

}
catch (SQLException ex) {
ex.printStackTrace();
System.out.println(query);

}
catch (Exception e) {
System.err.println("Error: " + e.getMessage());

}

finally {

try {
if (m_ResultSet != null)
m_ResultSet.close();
if (m_Statement != null)
m_Statement.close();
if (m_Connection != null)
m_Connection.close();
}
catch (SQLException ex) {
ex.printStackTrace();
}
}
[/code]