目前我正在做两件事,你可以在注释的行中看到它的作用,但这不是这里的主要目的.任何人都可以告诉我要做些什么来取代这些意见吗？

import java.lang.ClassNotFoundException;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.sqlException;
import java.sql.DriverManager;

public class Main
{
    public static void main(String[] args)
    {
        Connection connection = null;
        PreparedStatement preparedStatementWithdraw = null;
        PreparedStatement preparedStatementDeposit = null;

        try
        {
            Class.forName("com.MysqL.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:MysqL://localhost:3306/youtube","root","root");

            preparedStatementWithdraw = withdrawFromChecking(connection,preparedStatementWithdraw,new BigDecimal(100),1);
            preparedStatementDeposit = depositIntoSaving(connection,preparedStatementDeposit,new BigDecimal(300),1);

            //preparedStatementDeposit.executeBatch();
            //preparedStatementWithdraw.executeBatch();
            System.out.println("Account Modified!");
        }
        catch(ClassNotFoundException error)
        {
            System.out.println("Error: " + error.getMessage());
        }
        catch(sqlException error)
        {
            System.out.println("Error: " + error.getMessage());
        }
        finally
        {
            if(connection != null) try{connection.close();} catch(sqlException error) {}
            if(preparedStatementDeposit != null) try{preparedStatementDeposit.close();} catch(sqlException error) {}
        }
    }

    public static PreparedStatement withdrawFromChecking(Connection connection,PreparedStatement preparedStatement,BigDecimal balance,int id) throws sqlException
    {
        preparedStatement = connection.prepareStatement("UPDATE bankAccount SET checkingBalance = checkingBalance - ? WHERE id = ?");
        preparedStatement.setBigDecimal(1,balance);
        preparedStatement.setInt(2,id);
        preparedStatement.addBatch();

        return preparedStatement;
    }

    public static PreparedStatement depositIntoSaving(Connection connection,int id) throws sqlException
    {
        preparedStatement = connection.prepareStatement("UPDATE bankAccount SET savingBalance = savingBalance + ? WHERE id = ?");
        preparedStatement.setBigDecimal(1,id);
        preparedStatement.addBatch();

        return preparedStatement;
    }
}