Question

我的项目真的很糟糕，我对java很新，对数据库来说真的很新。我在我的代码中所做的就是用一堆单词填充“数据”对象，但我想要做的是用我制作的数据库中的信息填充这些帧。我一直在谷歌搜索并搜索几天，但没有找到任何可以帮助我理解我需要做的事情。任何帮助将不胜感激。

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.awt.event.*;

public class Project3 extends JFrame {
private JPanel contentPane;
private JTable table_1;
private JScrollPane scrollPane;
String[] columnNames = { "Restaurant", "Dish", "Type", "Price", "Rating" };
Object[][] data = {
        { "Nemo", "Vesuvio", "Pizza", new String("65kr"), new Integer(7) },
        { "John", "Doe", "Rowing", new Integer(3), new Boolean(true) },
        { "Sue", "Black", "Knitting", new Integer(2), new Boolean(false) },
        { "Jane", "White", "Speed reading", new Integer(20),
                new Boolean(true) },
        { "Joe", "Brown", "Pool", new Integer(10), new Boolean(false) } };

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Project3 frame = new Project3();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public Project3() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 800, 600);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    contentPane.setLayout(new BorderLayout(0, 0));
    setContentPane(contentPane);
    JPanel panel = new JPanel();
    contentPane.add(panel, BorderLayout.CENTER);
    panel.setLayout(null);
    scrollPane = new JScrollPane();
    scrollPane.setBounds(139, 162, 469, 420);
    panel.add(scrollPane);
    table_1 = new JTable(data, columnNames);
    scrollPane.setViewportView(table_1);
    table_1.setFillsViewportHeight(true);
    table_1.setModel(new DefaultTableModel(new Object[][] {
            { "Nemo", "blah", "Pizza", "65kr", new Integer(7) },
            { "Nemo", "blah", "Rowing", "1 000 000kr", Boolean.TRUE },
            { "Sue", "blah", "Knitting", new Integer(2), Boolean.FALSE },
            { "Jane", "blah", "Speed reading", new Integer(20),
                    Boolean.TRUE },
            { "Joe", "Brown", "Pool", new Integer(10), Boolean.FALSE },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null },
            { null, null, null, null, null }, }, new String[] {
            "Restaurant", "Dish", "Type", "Price", "Rating" }));
    JButton btnChangeadd = new JButton("Change/Add");
    btnChangeadd.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {
            // CALL CHANGE METHOD HERE
        }
    });
    btnChangeadd.setFont(new Font("Lucida Grande", Font.PLAIN, 16));
    btnChangeadd.setBounds(143, 104, 175, 42);
    panel.add(btnChangeadd);
    JLabel lblNewLabel = new JLabel("Welcome RestaurantID");
    lblNewLabel.setFont(new Font("Lucida Grande", Font.PLAIN, 24));
    lblNewLabel.setBounds(264, 56, 260, 36);
    panel.add(lblNewLabel);
    JButton button = new JButton("+");
    button.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {
            // CALL SOMETHING HERE IF YOU WANT
        }
    });
    button.setBounds(66, 248, 40, 29);
    panel.add(button);
    JButton button_1 = new JButton("-");
    button_1.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {

        }
    });
    button_1.setBounds(66, 289, 40, 29);
    panel.add(button_1);
    JButton btnDelete = new JButton("Delete");
    btnDelete.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {
            //DELETE METHOD
        }
    });
    btnDelete.setFont(new Font("Lucida Grande", Font.PLAIN, 16));
    btnDelete.setBounds(344, 104, 191, 42);
    panel.add(btnDelete);
    JButton btnLogOut = new JButton("Log out");
    btnLogOut.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {
        }
    });
    btnLogOut.setBounds(667, 6, 117, 29);
    panel.add(btnLogOut);
}

}

Answer 1

从JDBC tutorial开始，然后研究文章Table From Database。此外，

在可用时使用常量或工厂，而不是不必要的构造函数，例如：

{"Nemo", "Vesuvio", "Pizza", "65kr", 7},
{"John", "Doe", "Rowing", 3, true},
{"Sue", "Black", "Knitting", Integer.valueOf(3), Boolean.FALSE},

使用@Override注释以避免粗心过载：
```
@Override
public void run() {
    ...
}
```
开始使用Java Collections Framework包含对象方向，而不是数组。请注意引用的示例如何指定正式参数，例如List<T>，其中List是接口类型，T是泛型类型参数。

从MySQL提交Jframe

1 个答案: