需求说明：继续完善英雄信息系统。使用JDBC技术，通过PreparedStatement对象的executeQuery()方法获取表示所有英雄数据的ResultSet结果集。通过遍历表示英雄数据的ResultSet结果集，获得每个英雄具体的英雄编号、英雄名字、血量、攻击值、魔法值、英雄类型信息。实现...

java编程思想第四版第十四章类型信息习题

fdadfa第三题upackage net.mindview.typeinfo.test4; import java.util.ArrayList; import java.util.Arrays; import java.util.List; abstract class Shape { void...

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