Eclipse自带的bookemark不好用，用这个Quickmarks plugin。
http://eclipse-tools.sourceforge.net/quickmarks/index.html
用法：
Ctrl+Alt+1 add a bookmark with the label Mark-1
...
Ctrl+Alt+9 add a bookmark with the label Mark-9
Alt-1 jump to the bookmark with the label Mark-1
...
Alt-9 jump to the bookmark with the label Mark-9
If you add a bookmark that exist already, the old one will be deleted.
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