JTable单元格编辑时文本光标不可见的问题如何解决？

该现象是Swing JTable的默认机制导致的：通过键盘（Tab、方向键、F2等）触发单元格进入编辑状态时，仅激活编辑标识，不会主动将输入焦点移交到编辑器内部的文本输入组件，因此文本光标不可见，但编辑状态实际已激活，输入内容可以正常写入。

通过重写JTable的editCellAt方法，在编辑状态成功激活后主动为编辑器组件请求焦点即可，修改代码中JTable的初始化逻辑：

table = new JTable(tableModel) {
    @Override
    public boolean editCellAt(int row, int column, EventObject e) {
        boolean editStarted = super.editCellAt(row, column, e);
        if (editStarted) {
            Component editor = getEditorComponent();
            if (editor != null) {
                // 优先使用requestFocusInWindow，跨平台兼容性更好
                editor.requestFocusInWindow();
                // 可选逻辑：将光标定位到文本末尾，符合常规输入习惯
                if (editor instanceof JTextField) {
                    JTextField textField = (JTextField) editor;
                    textField.setCaretPosition(textField.getText().length());
                }
            }
        }
        return editStarted;
    }
};

如果需要选中单元格后直接输入字符即可进入编辑，不需要额外按F2，可额外添加配置：

table.setSurrendersFocusOnKeystroke(true);

import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import java.awt.Component;
import java.util.EventObject;
import javax.swing.JTextField;

public class TableTest extends JFrame {
    
    private JTable table;
    private DefaultTableModel tableModel;
    
    public TableTest() {
        setSize(500, 500);
        setResizable(false);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final String[] head = {"ID", "NAME"};
        tableModel = new DefaultTableModel(null, head);
        table = new JTable(tableModel) {
            @Override
            public boolean editCellAt(int row, int column, EventObject e) {
                boolean editStarted = super.editCellAt(row, column, e);
                if (editStarted) {
                    Component editor = getEditorComponent();
                    if (editor != null) {
                        editor.requestFocusInWindow();
                        if (editor instanceof JTextField) {
                            JTextField textField = (JTextField) editor;
                            textField.setCaretPosition(textField.getText().length());
                        }
                    }
                }
                return editStarted;
            }
        };
        table.setSurrendersFocusOnKeystroke(true);
        tableModel.addRow(new Object[] {"1", "Cristiano Ronaldo"});
        tableModel.addRow(new Object[] {"2", "Lionel Messi"});
        add(table);
    }

    public static void main(String[] args) {
        new TableTest().setVisible(true);
    }
    
}

内容的提问来源于stack exchange，提问作者Bu Saeed