interest the jvm or GC and java running tuning

in may work frequently use debugging tools for java,example jconsole,jstat,jmap,jinfo,jstack,so let me learn more of java tuning skills in discussion with your

too cold in snow days

beijing has been a recent snow,very cold!so before leave home,i wear the same fat as the snowman.
How do you prevent cold? Do you like snow?

the same as the nickelback songs

iam very much like nickelback,every time i heard their songs or watch their mv alway
let my brain has its own in the singing scenes, feels so cool!
when you are feeling songs?

record each day do you do?

Iam a system engineer,every day a lot of phone customer and coworker,many times this would hava interrupted the original work is another thing to do,so every night when i sum up the day's work...