Physics elimination

[pspeed]

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Markdown code block : Embed your code in 3 backticks, like this ```<optional language> //your code here ``` If you don’t know how to type a backtick, here are some related links : How to type a backtick on windows For mac users : On qwerty keyboards it’s the key right to the left shift (along with the " key). On azerty keyboards it’s the key over the right shift (along with the £ key). This uses highlight.js, but uses a subset of the supported langages (following code block uses java)…

@angel999

but some thing get wrong with null pointer exeptio

Don’t even bother to mention exceptions without a stack trace. The name/type of exception is only 5% of the useful information. Only slightly better than saying “doesn’t work”.