用java写的2d物理引擎。里面包含了一个carDemo。适合用来做一些2d的游戏的力场，碰撞等物理系统。-Using java to write the 2d physics engine. Which contains a carDemo. Suited to make some 2d games of the force field, collision and other physical systems.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001265s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.089427s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001205s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001873s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001206s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003643s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001024s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003172s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016063s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001350s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 46648 [ RunTime:0.001251s ]
