TreeMap to generate a histogram of word frequencies

Here is the input file:

how
much
wood
would
a
wood
chuck
chuck
if
a
wood
chuck
would
chuck
wood

We want to generate a list of the unique words followed by their frequency of occurrence in the file. The list of words is to be sorted by the left column (the key).

a       2
chuck   4
how     1
if      1
much    1
wood    4
would   2