All sources except k1_p2a.png and k1_p3a.png are licensed under MIT License (see LICENSE).
k1_p2a.png and k1_p3a.png are from フリーゲーム素材&無料ゲーム (http://game.yu-nagi.com/). See http://game.yu-nagi.com/htm/riyoukiyaku.htm if you want to use them.
Run this command in a directory which is located with applet.html if you're using unix-like system: javac $(find * -name \*.java)
Then run appletviewer applet.html