Read text file in java

Question

Hey, I need to read a textfile in java. The problem is that the file has the following format:

Id time1 time2 time3 ...
ID2 time1 time2 time3 ...
         


        

Answer 1

We can't read files column-by-column. Read the whole file into memory (FileReader of java.nio) and parse the content (String#split on each line) in a datastructure like

Map>

where the maps key is the id (ID, ID2, ..) and the value a simple list that contains all the time values.