JTable CellRenderer仅在聚焦时更改前景颜色

import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.*;

public class CustomCellRenderer extends DefaultTableCellRenderer {
    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        Component component = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        
        if (hasFocus) {
            // 设置聚焦时的前景颜色
            component.setForeground(Color.RED);
        } else {
            // 恢复默认的前景颜色
            component.setForeground(table.getForeground());
        }
        
        return component;
    }
}

// 创建JTable对象
JTable table = new JTable();

// 获取表格列模型
TableColumnModel columnModel = table.getColumnModel();

// 获取指定列的TableColumn对象
TableColumn column = columnModel.getColumn(columnIndex);

// 设置该列的CellRenderer
column.setCellRenderer(new CustomCellRenderer());