java - Swing :JTable列

这是我的问题。我必须创建一个具有3列（饮料，价格，数量）的Jtable，然后，我必须创建一个按钮“ add”和一个“ total”按钮，并带有JOptionPane作为结果总计。

这是一个视觉效果：
enter image description here

我希望创建一个包含价格*数量的“总计”按钮（带有JOptionPane）。但是，我不知道该怎么办。

这是我的代码。

J框架

private void jButtonAjoutActionPerformed(java.awt.event.ActionEvent evt) {
        String tmp = JOptionPane.showInputDialog(this, "Enter your drink please : ", "Title", JOptionPane.QUESTION_MESSAGE);
        float p = Float.parseFloat(JOptionPane.showInputDialog(this, "Enter your price please :", "Title", JOptionPane.QUESTION_MESSAGE));
        int quant = Integer.parseInt(JOptionPane.showInputDialog(this, "Enter your quantity please :", "Title", JOptionPane.QUESTION_MESSAGE));
        if (tmp != null)
        {
            myModel.addElement(new Drink(tmp, p, quant));
        } //(tmp != null)

    }

    private void jButtonSumActionPerformed(java.awt.event.ActionEvent evt) {
        // Button total
        float result = 0;
        for(int y = 0; y < jTable1.getRowCount(); y++)
        {
            result = Float.parseFloat(jTable1.getValueAt(y, 1).toString());
        }

    }

TableModelDrink

import java.util.ArrayList;
import javax.swing.table.AbstractTableModel;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

public class TableModelDrinks extends AbstractTableModel {
    private ArrayList<Drink>  myList = new ArrayList <>();

    @Override
    public int getRowCount() {
        return myList.size();
    }

    @Override
    public int getColumnCount() {
        return 3;
    }

    @Override
    public Object getValueAt(int i, int j) {
        switch (j)
        {
            case 0: return myList.get(i).getName();
            case 1: return myList.get(i).getPrice();
            case 2: return myList.get(i).getQuantity();
            default: return null;
        }

    }

    @Override
    public String getColumnName(int j)
    {
        switch (j)
        {
            case 0: return "Drink";
            case 1: return "Price";
            case 2: return "Quantity";
            default: return null;
        }

    }

    public void addElement(Drink elt)
    {
        myList.add(elt);
        this.fireTableDataChanged();
    }

    public void setValueAt(Object value, int rowIndex, int colIndex) {
        switch (colIndex) {
            case 0:
                myList.get(rowIndex).setName((String) value);
                break;

            case 1:
                myList.get(rowIndex).setPrice(Float.parseFloat((String ) value));
                break;

            case 2:
                myList.get(rowIndex).setQuantity(Integer.parseInt((String ) value));
                break;
        }
        fireTableRowsUpdated(rowIndex, rowIndex);
    }
}

喝

public class Drink {
    private String name;
    private float price;
    private int quantity;

    public Drink(String name, float price, int quantity) {
        this.name = name;
        this.price = price;
        this.quantity = quantity;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public int getQuantity() {
        return quantity;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }


}

谢谢你的帮助

最佳答案

这简单。只需将以下方法添加到您的TableModelDrinks

public Drink drinkAt(int row) {
    return myList.get(row);
}

然后，您可以按照以下方式实现sum方法：

private void jButtonSumActionPerformed(java.awt.event.ActionEvent evt) {
    TableModelDrinks model = (TableModelDrinks) jTable1.getModel();
    float result = 0;
    for (int i = 0; i < model.getRowCount(); i++) {
        Drink d = model.drinkAt(i);
        result += d.getPrice() * d.getQuantity();
    }
    NumberFormat format = NumberFormat.getCurrencyInstance();
    JOptionPane.showMessageDialog(jTable1, "Your total price is: " + format.format(result), "Price", JOptionPane.INFORMATION_MESSAGE);
}

关于java - Swing :JTable列，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/50154668/