组合框seteditable(true)

组合框的setEditable(boolean)方法用于设置组合框是否可编辑。如果将其设置为true，则用户可以在组合框中输入文本。如果设置为false，则用户只能从下拉列表中选择预定义的选项。

例如，以下代码将创建一个组合框并将其设置为可编辑：

JComboBox<String> comboBox = new JComboBox<>();
comboBox.setEditable(true);

这将创建一个空的组合框，允许用户输入自己的文本。

相关问题

Java编写类Example05，创建JPanel面板；创建一个组合框并为组合框添加选项；为组合框添加事件监听器，所选择的组合框内容会显示在文本框中。

好的，下面是实现您所需功能的Java代码：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Example05 extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private JPanel panel;
    private JComboBox<String> comboBox;
    private JTextField textField;

    public Example05() {
        setTitle("组合框示例");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        panel = new JPanel(new BorderLayout());

        comboBox = new JComboBox<String>();
        comboBox.addItem("选项1");
        comboBox.addItem("选项2");
        comboBox.addItem("选项3");
        comboBox.addActionListener(this);

        textField = new JTextField();
        textField.setEditable(false);

        panel.add(comboBox, BorderLayout.NORTH);
        panel.add(textField, BorderLayout.CENTER);

        getContentPane().add(panel);
        pack();
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == comboBox) {
            String selected = (String) comboBox.getSelectedItem();
            textField.setText(selected);
        }
    }

    public static void main(String[] args) {
        new Example05();
    }
}

在上述代码中，我们创建了一个JPanel面板，并在面板上添加了一个JComboBox组合框和一个JTextField文本框。我们为组合框添加了三个选项，并使用addActionListener方法为组合框添加了事件监听器，在监听器中获取用户选择的选项，并将其显示在文本框中。

用java写一个Student对象信息，声明StudentJFrame框架类和StudentJPanel对象信息面板，要求①增加查找组合框数据项，提供Person类按省份、城市等多种查找依据提供按姓氏、出生年份等进行模糊查询。② 使用一种日期组件 输入 生日期。③设置省份和城市组合框为可编辑的，将输入的省份和城市字符串添加到各组合框数据项。要求需要用到JTable组件，用Java写出

好的，这是一个比较复杂的题目，我会尽力解答。

首先，我们需要定义一个Student类，包括姓名、性别、出生日期、省份、城市等属性，以及相关的getter和setter方法。代码如下：

public class Student {
    private String name;
    private String gender;
    private Date birthday;
    private String province;
    private String city;

    public Student(String name, String gender, Date birthday, String province, String city) {
        this.name = name;
        this.gender = gender;
        this.birthday = birthday;
        this.province = province;
        this.city = city;
    }

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}

接下来，我们需要定义一个StudentJFrame类，作为整个界面的主框架。代码如下：

public class StudentJFrame extends JFrame {
    private JComboBox<String> provinceComboBox;
    private JComboBox<String> cityComboBox;
    private JComboBox<String> searchComboBox;
    private JTextField searchTextField;
    private JTable table;

    public StudentJFrame() {
        setTitle("学生信息管理系统");
        setSize(800, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 初始化组件
        JLabel provinceLabel = new JLabel("省份：");
        JLabel cityLabel = new JLabel("城市：");
        JLabel searchLabel = new JLabel("查找：");
        provinceComboBox = new JComboBox<>();
        provinceComboBox.setEditable(true);
        cityComboBox = new JComboBox<>();
        cityComboBox.setEditable(true);
        searchComboBox = new JComboBox<>(new String[]{"按省份", "按城市", "按姓氏", "按出生年份"});
        searchTextField = new JTextField();
        JButton addButton = new JButton("添加");
        JButton deleteButton = new JButton("删除");
        JButton searchButton = new JButton("查找");
        table = new JTable(new DefaultTableModel(new Object[]{"姓名", "性别", "出生日期", "省份", "城市"}, 0));

        // 设置日期组件
        JSpinner.DateEditor editor = new JSpinner.DateEditor(new JSpinner(), "yyyy-MM-dd");
        JSpinner spinner = new JSpinner(editor);
        JFormattedTextField textField = ((JSpinner.DefaultEditor) spinner.getEditor()).getTextField();
        textField.setEditable(false);
        textField.setBackground(Color.WHITE);
        spinner.setPreferredSize(new Dimension(120, 24));

        // 添加组件到面板
        JPanel panel = new JPanel(new BorderLayout());
        JPanel topPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
        topPanel.add(provinceLabel);
        topPanel.add(provinceComboBox);
        topPanel.add(cityLabel);
        topPanel.add(cityComboBox);
        topPanel.add(searchLabel);
        topPanel.add(searchComboBox);
        topPanel.add(searchTextField);
        topPanel.add(searchButton);
        topPanel.add(addButton);
        topPanel.add(deleteButton);
        panel.add(topPanel, BorderLayout.NORTH);
        panel.add(new JScrollPane(table), BorderLayout.CENTER);
        panel.add(spinner, BorderLayout.SOUTH);
        setContentPane(panel);

        // 添加事件监听器
        addButton.addActionListener(e -> {
            String name = JOptionPane.showInputDialog(this, "请输入姓名：");
            if (name != null) {
                String gender = JOptionPane.showInputDialog(this, "请输入性别：");
                if (gender != null) {
                    Date birthday = (Date) spinner.getValue();
                    String province = (String) provinceComboBox.getSelectedItem();
                    String city = (String) cityComboBox.getSelectedItem();
                    Student student = new Student(name, gender, birthday, province, city);
                    DefaultTableModel model = (DefaultTableModel) table.getModel();
                    model.addRow(new Object[]{student.getName(), student.getGender(), student.getBirthday(), student.getProvince(), student.getCity()});
                }
            }
        });

        deleteButton.addActionListener(e -> {
            int[] selectedRows = table.getSelectedRows();
            if (selectedRows.length > 0) {
                DefaultTableModel model = (DefaultTableModel) table.getModel();
                for (int i = selectedRows.length - 1; i >= 0; i--) {
                    model.removeRow(selectedRows[i]);
                }
            }
        });

        searchButton.addActionListener(e -> {
            String keyword = searchTextField.getText();
            int index = searchComboBox.getSelectedIndex();
            DefaultTableModel model = (DefaultTableModel) table.getModel();
            TableRowSorter<DefaultTableModel> sorter = new TableRowSorter<>(model);
            table.setRowSorter(sorter);
            switch (index) {
                case 0:
                    sorter.setRowFilter(RowFilter.regexFilter(keyword, 3));
                    break;
                case 1:
                    sorter.setRowFilter(RowFilter.regexFilter(keyword, 4));
                    break;
                case 2:
                    sorter.setRowFilter(RowFilter.regexFilter(keyword, 0));
                    break;
                case 3:
                    sorter.setRowFilter(RowFilter.regexFilter(keyword, 2));
                    break;
            }
        });
    }
}

最后，我们需要定义一个StudentJPanel类，作为学生信息的编辑面板。代码如下：

public class StudentJPanel extends JPanel {
    private JTextField nameTextField;
    private JTextField genderTextField;
    private JSpinner birthdaySpinner;
    private JTextField provinceTextField;
    private JTextField cityTextField;

    public StudentJPanel(Student student) {
        setLayout(new GridLayout(5, 2, 10, 10));

        JLabel nameLabel = new JLabel("姓名：");
        JLabel genderLabel = new JLabel("性别：");
        JLabel birthdayLabel = new JLabel("出生日期：");
        JLabel provinceLabel = new JLabel("省份：");
        JLabel cityLabel = new JLabel("城市：");
        nameTextField = new JTextField(student.getName());
        genderTextField = new JTextField(student.getGender());
        birthdaySpinner = new JSpinner(new SpinnerDateModel(student.getBirthday(), null, null, Calendar.DAY_OF_MONTH));
        provinceTextField = new JTextField(student.getProvince());
        cityTextField = new JTextField(student.getCity());

        JSpinner.DateEditor editor = new JSpinner.DateEditor(birthdaySpinner, "yyyy-MM-dd");
        JFormattedTextField textField = ((JSpinner.DefaultEditor) birthdaySpinner.getEditor()).getTextField();
        textField.setEditable(false);
        textField.setBackground(Color.WHITE);
        birthdaySpinner.setEditor(editor);

        add(nameLabel);
        add(nameTextField);
        add(genderLabel);
        add(genderTextField);
        add(birthdayLabel);
        add(birthdaySpinner);
        add(provinceLabel);
        add(provinceTextField);
        add(cityLabel);
        add(cityTextField);
    }

    public Student getStudent() {
        String name = nameTextField.getText();
        String gender = genderTextField.getText();
        Date birthday = (Date) birthdaySpinner.getValue();
        String province = provinceTextField.getText();
        String city = cityTextField.getText();
        return new Student(name, gender, birthday, province, city);
    }
}

这样，我们就完成了所有的代码编写。接下来，我们可以在主函数中创建StudentJFrame并显示出来了。代码如下：

public static void main(String[] args) {
    SwingUtilities.invokeLater(() -> {
        StudentJFrame frame = new StudentJFrame();
        frame.setVisible(true);
    });
}

这就是整个程序的代码实现过程。在界面上，我们使用了JComboBox、JTextField、JButton、JTable等组件，同时还使用了RowFilter对表格进行筛选。在学生信息的编辑面板上，我们使用了JSpinner组件输入日期。