java 2D swing

http://myleslittlewolf.pixnet.net/blog/post/2836595

http://pydoing.blogspot.tw/2011/05/java-basic-concept-of-gui.html

it-easy.tw/java-linedraw/

http://stackoverflow.com/questions/5801734/how-to-draw-lines-in-java

https://www.youtube.com/watch?v=MqwSKoWTuZE

https://www.youtube.com/watch?v=y7YbQrrcpAQ

https://docs.oracle.com/javase/7/docs/api/javax/swing/JFrame.html

http://docs.oracle.com/javase/7/docs/api/javax/swing/JComponent.html#method_summary

http://www.java2s.com/Tutorial/Java/0261__2D-Graphics/Drawaline.htm

http://www.java2s.com/Tutorial/Java/0240__Swing/ExtendsJComponenttocreatedrawingpad.htm

http://codex.wiki/question/1992591-2967/

http://www.javaworld.com.tw/jute/post/view?bid=5&id=312003

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