目录1. 防火墙工具对比2. iptables 基础配置2.1 查看规则2.2 清空规则2.3 基础规则示例2.4 高级功能3. ufw（Uncomplicated Firewall）配置3.1 启用与禁用3.2 规则配置3.3 高级配置4. firewalld 配置4.1 启用与禁用4.
Im currently creating a tile-based game for android. Using java via dalvik JVM. im fretting over a decision to represent objects in a particular map. should i use an id based map (2 dimensional intege
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