12 constant

definition:

1 Example 1:

public class MallConst {
    
    
	public static final String CURRENT_USER = "currentUser";

	public static final Integer ROOT_PARENT_ID = 0;
}

use:

import static com.imooc.mall.consts.MallConst.ROOT_PARENT_ID;


if (category.getParentId().equals(ROOT_PARENT_ID)) {
    
    
				CategoryVo categoryVo = new CategoryVo();
				BeanUtils.copyProperties(category, categoryVo);
				categoryVoList.add(categoryVo);
}

2 Example 2:

private final static String CART_REDIS_KEY_TEMPLATE = "cart_%d";