android - How TXT file write and clean -

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i want write 1 value example 'm' txt file , next time want write new value before write clean value in txt , new write.

example :

i save 'm' write in m.txt next time write in txt file delete valaue 'm' in txt file , write new value example 'n'

(any platform) delete previous file (if exists) , create again.


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