> install.packages("rjava")
将程序包安装入‘C:/Users/Admin/Documents/R/win-library/3.5’
(因为‘lib’没有被指定)
Warning: 无法在貯藏處https://mirror.las.iastate.edu/CRAN/src/contrib中读写索引:
  无法打开URL'https://mirror.las.iastate.edu/CRAN/src/contrib/PACKAGES'
Warning: 无法在貯藏處https://mirror.las.iastate.edu/CRAN/bin/windows/contrib/3.5中读写索引:
  无法打开URL'https://mirror.las.iastate.edu/CRAN/bin/windows/contrib/3.5/PACKAGES'
Warning message:
package ‘rjava’ is not available (for R version 3.5.2)
>