我无法对 JTable--Java 进行排序

Question

当我点击列时，排序结果是错误的：

这是我的代码：

DefaultTableModel tableModel = new DefaultTableModel(data, columns) {

        @Override
        public boolean isCellEditable(int row, int column) {
            //all cells false
            return false;
        }
    };
    JTable table = new JTable();
    table.setModel(tableModel);

    //Sort table
    table.setAutoCreateRowSorter(true);

这是列和数据的代码：
couponArray: 是对象

        // Columns of table
    String[] columns = {"Name of Coupon Provider", "Name of product", "Price of product",
            "Discount rate of the coupon (%)", "Final price", "Expiration Period", "Status of a coupon"};

    //Data of table
    int lengthArray = couponArray.size();
    String data[][] = new String [lengthArray][7];
    for (int i = 0; i < lengthArray; i++){
        Coupon sTmp = (Coupon)couponArray.get(i);
        data[i][0] = sTmp.getNameOfCouponProvider();
        data[i][1] = sTmp.getNameOfProduct();
        data[i][2] = Double.toString(sTmp.getPriceOfProduct());
        data[i][3] = Integer.toString(sTmp.getDiscountRateOfCoupon());

        //Get final price
        double finalPrice = sTmp.getPriceOfProduct() -
                sTmp.getPriceOfProduct()*((double)sTmp.getDiscountRateOfCoupon()/100);
        data[i][4] = new Formatter().format("%.2f", finalPrice).toString();
        data[i][5] = Integer.toString(sTmp.getExpirationPeriod());
        data[i][6] = sTmp.getStatusOfCoupon();
    }

Answer 1

请参阅下面的解决方案。现在它对 "Price of product" 进行了正确排序。主要更改是覆盖 table 模型中的 getColumnClass()。通过此更改，"Price of product" 值被视为数字。之前它们被视为字符串。

我也把数据数组的类型改成了Object[][]。并将 double 值设置为 data[i][2] 而不将其转换为 String.

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import java.awt.BorderLayout;
import java.util.Arrays;
import java.util.Formatter;
import java.util.List;

public class TableSorting
{
  public static void main(String[] args)
  {
    // Columns of table
    String[] columns = {"Name of Coupon Provider", "Name of product", "Price of product",
        "Discount rate of the coupon (%)", "Final price", "Expiration Period", "Status of a coupon"};

    //Data of table
    List<Coupon> couponArray = Arrays.asList(
        new Coupon("aaa", "bbb", 100.2, 1, 1, "a"),
        new Coupon("aaa", "bbb", 60.2, 1, 1, "a"),
        new Coupon("aaa", "bbb", 160.4, 1, 1, "a"),
        new Coupon("aaa", "bbb", 220.2, 1, 1, "a"),
        new Coupon("aaa", "bbb", 70.2, 1, 1, "a"),
        new Coupon("aaa", "bbb", 150.2, 1, 1, "a"),
        new Coupon("aaa", "bbb", 160.3, 1, 1, "a"),
        new Coupon("aaa", "bbb", 210.3, 1, 1, "a"));

    int lengthArray = couponArray.size();
    Object data[][] = new Object[lengthArray][7];
    for (int i = 0; i < lengthArray; i++){
      Coupon sTmp = couponArray.get(i);
      data[i][0] = sTmp.getNameOfCouponProvider();
      data[i][1] = sTmp.getNameOfProduct();
      data[i][2] = sTmp.getPriceOfProduct();//Double.toString(sTmp.getPriceOfProduct());
      data[i][3] = Integer.toString(sTmp.getDiscountRateOfCoupon());

      //Get final price
      double finalPrice = sTmp.getPriceOfProduct() -
          sTmp.getPriceOfProduct()*((double)sTmp.getDiscountRateOfCoupon()/100);
      data[i][4] = new Formatter().format("%.2f", finalPrice).toString();
      data[i][5] = Integer.toString(sTmp.getExpirationPeriod());
      data[i][6] = sTmp.getStatusOfCoupon();
    }

    DefaultTableModel tableModel = new DefaultTableModel(data, columns) {

      @Override
      public boolean isCellEditable(int row, int column) {
        //all cells false
        return false;
      }

      //This makes values in "Price" column treated as numerical values
      // instead of String values.
      @Override
      public Class<?> getColumnClass(int columnIndex)
      {
        if (columnIndex == 2)
        {
          return Double.class;
        }
        return super.getColumnClass(columnIndex);
      }
    };
    JTable table = new JTable();
    table.setModel(tableModel);

    //Sort table
    table.setAutoCreateRowSorter(true);

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(new JScrollPane(table), BorderLayout.CENTER);
    frame.pack();
    frame.setVisible(true);
  }
}

class Coupon
{
  private String nameOfCouponProvider;
  private String nameOfProduct;
  private double priceOfProduct;
  private int discountRateOfCoupon;
  private int expirationPeriod;
  private String statusOfCoupon;

  Coupon(String nameOfCouponProvider, String nameOfProduct,
         double priceOfProduct, int discountRateOfCoupon,
         int expirationPeriod, String statusOfCoupon)
  {
    this.nameOfCouponProvider = nameOfCouponProvider;
    this.nameOfProduct = nameOfProduct;
    this.priceOfProduct = priceOfProduct;
    this.discountRateOfCoupon = discountRateOfCoupon;
    this.expirationPeriod = expirationPeriod;
    this.statusOfCoupon = statusOfCoupon;
  }

  String getNameOfCouponProvider() { return nameOfCouponProvider; }
  String getNameOfProduct() { return nameOfProduct; }
  double getPriceOfProduct() { return priceOfProduct; }
  int getDiscountRateOfCoupon() { return discountRateOfCoupon; }
  int getExpirationPeriod() { return expirationPeriod; }
  String getStatusOfCoupon() { return statusOfCoupon; }
}

我无法对 JTable--Java 进行排序

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