i am getting error while connecting to database (com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:

this is my code

public class DataBaseConnectivity {
public static void main(String args[])throws SQLException, ClassNotFoundException
{
	//String url="";
	//String uname="";
	//String pswd="";
	Class.forName("com.mysql.jdbc.Driver");	// loading and registering the driver
	Connection con;
	con=DriverManager.getConnection("jdbc:mysql://localhost:3306//BankAcc?autoReconnect=true&useSSL=false","root","1234");
	Statement stmt=con.createStatement();  
	ResultSet rs=stmt.executeQuery("select * from BankHolderDetails");  
	while(rs.next())  
	System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));  
	con.close();  
	}


}
//