Java Swing：计算JTable中价格总和并显示在JTextField中

import javax.swing.*;
import javax.swing.table.TableModel;
import java.awt.*;
import java.util.ArrayList;

public class TablePriceCalculator {

    private JTable jTableMain;
    private JTextField priceTextField;

    public TablePriceCalculator(JTable jTableMain, JTextField priceTextField) {
        this.jTableMain = jTableMain;
        this.priceTextField = priceTextField;
    }

    public void calculateTotalPrice() {
        TableModel model = jTableMain.getModel();
        int rowCount = model.getRowCount();
        int priceColumnIndex = 3; // 假设价格在第4列 (索引为3)
        double totalPrice = 0.0;

        for (int i = 0; i < rowCount; i++) {
            Object priceValue = model.getValueAt(i, priceColumnIndex);

            // 检查价格值是否为空
            if (priceValue != null) {
                try {
                    // 尝试将价格值转换为 Double
                    double price = Double.parseDouble(priceValue.toString());
                    totalPrice += price;
                } catch (NumberFormatException e) {
                    // 处理转换错误，例如，如果价格不是有效的数字
                    System.err.println("Invalid price format at row " + (i + 1) + ": " + priceValue);
                    // 可以选择跳过该行或采取其他错误处理措施
                }
            }
        }

        // 将总价格格式化为字符串并设置到 JTextField
        priceTextField.setText(String.format("%.2f", totalPrice));
    }

    public void jTableMain() {
        MyQuery1 mq1 = new MyQuery1();
        ArrayList<Carrier1> list = mq1.BookTable1();
        String[] columnName = {"책 코드", "책 이름", "로 고", "가 격"};
        Object[][] rows = new Object[list.size()][4];

        for(int i = 0; i < list.size(); i++) {
            // Make these changes
            Carrier1 carrier = list.get(i);
            rows[i][0] = carrier.getBook_code();
            rows[i][1] = carrier.getBook_name();

            if(carrier.getBookImage() != null) {
                ImageIcon image = new ImageIcon(new ImageIcon(carrier.getBookImage()).getImage().getScaledInstance(100, 90, Image.SCALE_SMOOTH));
                rows[i][2] = image;
            } else {
                rows[i][2] = null;
            }

            // Make these changes
            int price = carrier.getPrice();
            rows[i][3] = price;
        }

        TheModel model = new TheModel (rows, columnName);

        jTableMain.setModel(model); // 데이터 불러오기
        jTableMain.setRowHeight(90); // JTable 높이 지정
        jTableMain.getColumnModel().getColumn(2).setPreferredWidth(100); 

        // jTableSubMain에 데이터 불러오기
        //jTableSubMain.setModel(model);
        calculateTotalPrice();

 }

    // 假设的 MyQuery1 和 Carrier1 类
    private static class MyQuery1 {
        public ArrayList<Carrier1> BookTable1() {
            // 模拟从数据库获取数据
            ArrayList<Carrier1> list = new ArrayList<>();
            list.add(new Carrier1("1", "Book1", null, 10));
            list.add(new Carrier1("2", "Book2", null, 20));
            list.add(new Carrier1("3", "Book3", null, 30));
            return list;
        }
    }

    private static class Carrier1 {
        private String book_code;
        private String book_name;
        private byte[] bookImage;
        private int price;

        public Carrier1(String book_code, String book_name, byte[] bookImage, int price) {
            this.book_code = book_code;
            this.book_name = book_name;
            this.bookImage = bookImage;
            this.price = price;
        }

        public String getBook_code() {
            return book_code;
        }

        public String getBook_name() {
            return book_name;
        }

        public byte[] getBookImage() {
            return bookImage;
        }

        public int getPrice() {
            return price;
        }
    }
}

JTable table = new JTable();
JTextField textField = new JTextField();

// 假设你已经设置了 table 的 Model
TablePriceCalculator calculator = new TablePriceCalculator(table, textField);
calculator.jTableMain(); // 填充 table 数据并计算总价