Jtable綁定可編輯Jcombox控件失去焦點擷取不到目前值問題

使用Jcombox作為Jtable的單元格，想支援下拉和可手工輸入，發現手工輸入值後，焦點一離開，輸入的值丢失，變為下拉選擇的值，必須使用敲回車的方式或者tab鍵的方式才能儲存，覺得這樣很不友善，特意研究了源碼，發現重寫列的TableCellEditor的getCellEditorValue()即可。

但同時也存在另一個問題，發現焦點值被帶到下一行，是以又重寫了getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)，至此問題得到解決，以下是實作代碼：

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

public class JTableJcomboxTest extends JFrame{

    public JTableJcomboxTest(){
        this.setSize(500,400);
        this.setLayout(new BorderLayout());
        JTable jtable = new JTable(20,2);
        TableColumnModel columnModel = jtable.getColumnModel();
        TableColumn column0 = columnModel.getColumn(0);
        column0.setHeaderValue("名稱");
        DefaultCellEditor editor = new DefaultCellEditor(new JTextField());
        editor.setClickCountToStart(1);
        column0.setCellEditor(editor);
        TableColumn column1 = columnModel.getColumn(1);
        column1.setHeaderValue("格式");
        column1.setCellEditor(new MyComboxCellEditor());
        JScrollPane scroll = new JScrollPane(jtable);
        this.add(scroll);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }

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

    private static class MyComboxCellEditor extends DefaultCellEditor{
        private String[] items = new String[]{".java",".xml",".jpg"};
        public MyComboxCellEditor() {
            super(new JComboBox());
            JComboBox combox = ((JComboBox) this.editorComponent);
            combox.setModel(new DefaultComboBoxModel(items));
            combox.setEditable(true);
        }

        @Override
        public Object getCellEditorValue() {
            //直接從編輯器中取值
            ComboBoxEditor editor = ((JComboBox) this.editorComponent).getEditor();
            return editor.getItem();
        }
        public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
            //解決焦點值被帶到下一行問題
            JComboBox component = (JComboBox)super.getTableCellEditorComponent(table, value, isSelected, row, column);
            component.removeActionListener(this.delegate);
            component.removeAllItems();
            int selectedIndex = -1;
            for (int i = 0; i < items.length; i++) {
                if(items.equals(value)){
                    selectedIndex = i;
                }
                component.addItem(items[i]);
            }
            if (selectedIndex == -1){
                component.setSelectedItem(value);
            }else {
                component.setSelectedIndex(selectedIndex);
            }
            component.addActionListener(this.delegate);
            return component;
        }
    }
}
           

運作結果：