private void deleteActionPerformed() { // 获取关键字 String keyword = this.UserNameTxt.getText().trim(); // 创建表格行排序器 TableRowSorter<TableModel> sorter = new TableRowSorter<>(UserTable.getModel()); UserTable.setRowSorter(sorter); // 设置过滤器 RowFilter<TableModel, Integer> filter = new RowFilter<TableModel, Integer>() { public boolean include(Entry<? extends TableModel, ? extends Integer> entry) { String value = entry.getStringValue(4); return value.contains(keyword); } }; sorter.setRowFilter(filter); // 设置行过滤器 // 获取过滤后的结果的行数 int count = UserTable.getRowCount(); if (count == 0) { JOptionPane.showMessageDialog(this, "无法删除！", "提示", JOptionPane.INFORMATION_MESSAGE); return; } DefaultTableModel tableModel = (DefaultTableModel) UserTable.getModel(); tableModel.removeRow(count); }这个应该怎么修改才能实现上述功能，我现在输入它只显示特定行

根据您提供的代码，我看到您是通过添加行过滤器来实现对特定行的删除。如果您想要实现删除 JTable 中的任意行，可以直接删除 JTable 模型中的数据，而不需要使用行过滤器。

以下是一个修改过的代码示例，可以删除 JTable 中选中的行：

private void deleteActionPerformed() {
    // 获取选中的行号
    int selectedRow = UserTable.getSelectedRow();
    if (selectedRow == -1) {
        JOptionPane.showMessageDialog(this, "请先选择要删除的行！", "提示", JOptionPane.INFORMATION_MESSAGE);
        return;
    }
    // 从表格模型中删除选中的行
    DefaultTableModel tableModel = (DefaultTableModel) UserTable.getModel();
    tableModel.removeRow(selectedRow);
}

其中，`UserTable` 是您的 JTable 实例。

需要注意的是，这种方式只会删除 JTable 中的行，而不会删除数据源中的数据。如果您希望同时删除数据源中的数据，需要在删除 JTable 中的行之后，手动从数据源中删除相应的数据。

相关问题

public class MainActivity extends AppCompatActivity { private EditText searchEdit; private ImageButton searchBtn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); searchEdit = findViewById(R.id.search_edit); searchBtn = findViewById(R.id.search_btn); searchBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // 执行搜索操作 performSearch(); } }); // 设置软键盘的搜索按钮监听器 searchEdit.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { if (actionId == EditorInfo.IME_ACTION_SEARCH) { // 执行搜索操作 performSearch(); return true; } return false; } }); } private void performSearch() { String keyword = searchEdit.getText().toString().trim(); // 执行搜索操作，比如跳转到搜索结果页面 Intent intent = new Intent(this, SearchResultActivity.class); intent.putExtra("keyword", keyword); startActivity(intent); }}中actionId指的是什么

在这段代码中，`actionId`是指用户在软键盘上点击的动作（Action）的 ID，也就是指用户点击了软键盘上的哪个按钮。在这里，我们可以通过判断`actionId`是否等于 `EditorInfo.IME_ACTION_SEARCH`来判断用户是否点击了软键盘上的搜索按钮。如果用户点击了搜索按钮，就会执行 `performSearch()` 方法，进行搜索操作。

Java Swing图形用户界面编程实验代码按照实验步骤 1.实现页面菜单，菜单项包括按名字读取、按学号读取、按班级读取； 2.实现搜索框，用于输入名字或学号，根据名字或学号查询学生信息； 3.实现班级下拉列表，用于选择班级并按班级查询学生信息。 4.实现学生信息展示功能，展示从数据库中查询到的学生信息； 并使用SwingUtilities.invokeLater(JCUI::createUI);

以下是Java Swing图形用户界面编程实验的示例代码：

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;

public class JCUI extends JFrame implements ActionListener {
    
    private static final long serialVersionUID = 1L;
    private static final String DRIVER_CLASS = "com.mysql.jdbc.Driver";
    private static final String DATABASE_URL = "jdbc:mysql://localhost:3306/student";
    private static final String DATABASE_USER = "root";
    private static final String DATABASE_PASSWORD = "password";
    
    private JMenuBar menuBar;
    private JMenu fileMenu;
    private JMenuItem nameMenuItem;
    private JMenuItem idMenuItem;
    private JMenuItem classMenuItem;
    
    private JPanel searchPanel;
    private JTextField searchField;
    private JButton searchButton;
    
    private JPanel classPanel;
    private JLabel classLabel;
    private JComboBox<String> classComboBox;
    private JButton classButton;
    
    private JTable table;
    private DefaultTableModel tableModel;
    
    private Connection conn;
    private Statement stmt;
    
    public JCUI() {
        super("学生信息查询");
        setSize(800, 600);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        // 创建菜单栏
        menuBar = new JMenuBar();
        fileMenu = new JMenu("文件");
        nameMenuItem = new JMenuItem("按名字读取");
        idMenuItem = new JMenuItem("按学号读取");
        classMenuItem = new JMenuItem("按班级读取");
        nameMenuItem.addActionListener(this);
        idMenuItem.addActionListener(this);
        classMenuItem.addActionListener(this);
        fileMenu.add(nameMenuItem);
        fileMenu.add(idMenuItem);
        fileMenu.add(classMenuItem);
        menuBar.add(fileMenu);
        setJMenuBar(menuBar);
        
        // 创建搜索框和按钮
        searchPanel = new JPanel();
        searchPanel.setLayout(new BorderLayout());
        searchField = new JTextField();
        searchButton = new JButton("搜索");
        searchButton.addActionListener(this);
        searchPanel.add(searchField, BorderLayout.CENTER);
        searchPanel.add(searchButton, BorderLayout.EAST);
        searchPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        add(searchPanel, BorderLayout.NORTH);
        
        // 创建班级选择框和按钮
        classPanel = new JPanel();
        classPanel.setLayout(new BorderLayout());
        classLabel = new JLabel("班级：");
        classComboBox = new JComboBox<String>();
        classButton = new JButton("查询");
        classButton.addActionListener(this);
        classPanel.add(classLabel, BorderLayout.WEST);
        classPanel.add(classComboBox, BorderLayout.CENTER);
        classPanel.add(classButton, BorderLayout.EAST);
        classPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        add(classPanel, BorderLayout.SOUTH);
        
        // 创建表格
        tableModel = new DefaultTableModel();
        tableModel.addColumn("姓名");
        tableModel.addColumn("学号");
        tableModel.addColumn("班级");
        tableModel.addColumn("性别");
        tableModel.addColumn("年龄");
        table = new JTable(tableModel);
        table.setPreferredScrollableViewportSize(new Dimension(600, 400));
        table.setFillsViewportHeight(true);
        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane, BorderLayout.CENTER);
        
        // 连接数据库
        try {
            Class.forName(DRIVER_CLASS);
            conn = DriverManager.getConnection(DATABASE_URL, DATABASE_USER, DATABASE_PASSWORD);
            stmt = conn.createStatement();
            String sql = "SELECT DISTINCT class FROM student";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String className = rs.getString("class");
                classComboBox.addItem(className);
            }
            rs.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == nameMenuItem) {
            String name = JOptionPane.showInputDialog(this, "请输入姓名：");
            if (name != null && !name.trim().isEmpty()) {
                searchByName(name.trim());
            }
        } else if (e.getSource() == idMenuItem) {
            String id = JOptionPane.showInputDialog(this, "请输入学号：");
            if (id != null && !id.trim().isEmpty()) {
                searchById(id.trim());
            }
        } else if (e.getSource() == classMenuItem) {
            String className = JOptionPane.showInputDialog(this, "请输入班级：");
            if (className != null && !className.trim().isEmpty()) {
                searchByClass(className.trim());
            }
        } else if (e.getSource() == searchButton) {
            String keyword = searchField.getText().trim();
            if (!keyword.isEmpty()) {
                searchByNameOrId(keyword);
            }
        } else if (e.getSource() == classButton) {
            String className = (String) classComboBox.getSelectedItem();
            if (className != null && !className.trim().isEmpty()) {
                searchByClass(className.trim());
            }
        }
    }
    
    private void searchByName(String name) {
        clearTable();
        try {
            String sql = "SELECT * FROM student WHERE name LIKE '%" + name + "%'";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String[] row = new String[5];
                row[0] = rs.getString("name");
                row[1] = rs.getString("id");
                row[2] = rs.getString("class");
                row[3] = rs.getString("gender");
                row[4] = String.valueOf(rs.getInt("age"));
                tableModel.addRow(row);
            }
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    private void searchById(String id) {
        clearTable();
        try {
            String sql = "SELECT * FROM student WHERE id='" + id + "'";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String[] row = new String[5];
                row[0] = rs.getString("name");
                row[1] = rs.getString("id");
                row[2] = rs.getString("class");
                row[3] = rs.getString("gender");
                row[4] = String.valueOf(rs.getInt("age"));
                tableModel.addRow(row);
            }
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    private void searchByClass(String className) {
        clearTable();
        try {
            String sql = "SELECT * FROM student WHERE class='" + className + "'";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String[] row = new String[5];
                row[0] = rs.getString("name");
                row[1] = rs.getString("id");
                row[2] = rs.getString("class");
                row[3] = rs.getString("gender");
                row[4] = String.valueOf(rs.getInt("age"));
                tableModel.addRow(row);
            }
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    private void searchByNameOrId(String keyword) {
        clearTable();
        try {
            String sql = "SELECT * FROM student WHERE name LIKE '%" + keyword + "%' OR id='" + keyword + "'";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                String[] row = new String[5];
                row[0] = rs.getString("name");
                row[1] = rs.getString("id");
                row[2] = rs.getString("class");
                row[3] = rs.getString("gender");
                row[4] = String.valueOf(rs.getInt("age"));
                tableModel.addRow(row);
            }
            rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    private void clearTable() {
        int rowCount = tableModel.getRowCount();
        for (int i = rowCount - 1; i >= 0; i--) {
            tableModel.removeRow(i);
        }
    }
    
    public static void createUI() {
        JCUI ui = new JCUI();
        ui.setVisible(true);
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(JCUI::createUI);
    }

}

注意：这只是一个示例代码，实际项目中需要根据具体需求进行修改和完善。