how to install xlsx in R on ubuntu?

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ok,I just use the ubuntu 16.04 64,when I want to read a xlsx file,I find I should install RODBC or xlsx. This page

will tell us how to install the xlsx package in R on ubuntu.

first,we should install java.

       sudo apt-get install default-jdk

then,we shold use the line to observe the R and Java:

        sudo R CMD javareconf

but,I think,the first time,there is something wrong.

then,we should install java once a time,

sudo apt-get install default-jdk

sudo R CMD javareconf

ok,if there is no error,you should restart your ubuntu,and then

you can install xlsx in R.

use the line: install.packages('xlsx',dependencies=T)

I think the next question is how can type chinese on ubuntu