在JTable中更改特定的单元格颜色背景

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

public class CustomTableCellRenderer 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);

        // 判断特定的单元格，例如第2行第3列
        if (row == 1 && column == 2) {
            // 设置背景颜色为红色
            component.setBackground(Color.RED);
        } else {
            // 恢复默认的背景颜色
            component.setBackground(table.getBackground());
        }

        return component;
    }
}

JTable table = new JTable(data, columnNames);
table.setDefaultRenderer(Object.class, new CustomTableCellRenderer());