如何将唯一的JComboBox添加到JTable(Java)中的列

要将唯一的JComboBox添加到JTable（Java）中的列，您需要创建一个自定义的表格模型，该模型将包含一个JComboBox。以下是一个简单的示例，说明如何实现此目标：

首先，创建一个自定义的表格模型，该模型将包含一个JComboBox。

import javax.swing.*;
import javax.swing.table.AbstractTableModel;

public class ComboBoxTableModel extends AbstractTableModel {
    private String[] columnNames = {"Column 1", "Column 2", "Column 3"};
    private Object[][] data = {
            {"Item 1", "Item 2", "Item 3"},
            {"Item 4", "Item 5", "Item 6"},
            {"Item 7", "Item 8", "Item 9"}
    };
    private JComboBox<String> comboBox = new JComboBox<>(new String[]{"Option 1", "Option 2", "Option 3"});

    public ComboBoxTableModel() {
        comboBox.setEditable(true);
    }

    @Override
    public int getRowCount() {
        return data.length;
    }

    @Override
    public int getColumnCount() {
        return columnNames.length;
    }

    @Override
    public String getColumnName(int column) {
        return columnNames[column];
    }

    @Override
    public Class<?> getColumnClass(int columnIndex) {
        return getValueAt(0, columnIndex).getClass();
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        return data[rowIndex][columnIndex];
    }

    @Override
    public void setValueAt(Object value, int rowIndex, int columnIndex) {
        data[rowIndex][columnIndex] = value;
        fireTableCellUpdated(rowIndex, columnIndex);
    }

    public JComboBox<String> getComboBox() {
        return comboBox;
    }
}

接下来，创建一个JTable，并将自定义表格模型添加到JTable中。

import javax.swing.*;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import java.awt.*;

public class ComboBoxTableExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("JTable with ComboBox Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 400);

        ComboBoxTableModel tableModel = new ComboBoxTableModel();
        JTable table = new JTable(tableModel);

        TableColumn column = table.getColumnModel().getColumn(1);
        column.setCellRenderer(new ComboBoxRenderer(tableModel.getComboBox()));
        column.setCellEditor(new ComboBoxEditor(tableModel.getComboBox()));

        frame.add(new JScrollPane(table));
        frame.setVisible(true);
    }
}

最后，创建一个自定义的单元格渲染器和单元格编辑器，以便在JTable中显示和编辑JComboBox。

import javax.swing.*;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import java.awt.*;

public class ComboBoxRenderer extends JComboBox<String> implements TableCellRenderer {
    public ComboBoxRenderer(JComboBox<String> comboBox) {
        setModel(comboBox.getModel());
        setSelectedIndex(comboBox.getSelectedIndex());
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        setSelectedItem(value);
        return this;
    }
}

class ComboBoxEditor extends DefaultCellEditor {
    public ComboBoxEditor(JComboBox<String> comboBox) {
        super(comboBox);
    }

    @Override
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
        JComboBox<String> comboBox = (JComboBox<String>) getComponent();
        comboBox.setSelectedItem(value);
        return comboBox;
    }
}

现在，您已经成功地将唯一的JComboBox添加到了JTable中的列。