How To Draw Random Lines From File Java

Ezzaral 2,714 Posting Sage Team Colleague Featured Poster

14 Years Ago

Apply a BufferedReader with the readLine() method. You tin either skip lines every bit you read them, or place each line into an ArrayList, and process them every bit needed.

Ezzaral ii,714 Posting Sage Team Colleague Featured Poster

14 Years Agone

readLine() but sequentially reads lines from the file. If you only care well-nigh certain lines, maintain a counter as the lines are read and print/store/whatever lines you lot need based upon that counter.

              int lineNumber=0; Cord line=null; while ( (line = br.readLine()) != naught){   lineNumber++;   if ( <some expression on lineNumber> ){     // do something   } }

Ezzaral two,714 Posting Sage Squad Colleague Featured Poster

xiv Years Agone

If yous desire to randomly nowadays lines from the file, I would read all of the lines into an ArrayList first so become() them with a random int of the range 0 to size()-1.

Lioshenka

xiv Years Ago

Thanks a lot, I got it to work at present!

~s.o.south~ ii,560 Failure as a homo Team Colleague Featured Poster

14 Years Agone

Expect into the RandomAccessFile class. The only downside being the file is a treated as a sequence of bytes rather than the conventional line oriented view which many are used to. This course is especially for example useful when you want to come up with your custom file format which would accept a fixed header size.

~s.o.southward~ two,560 Failure every bit a human being Team Colleague Featured Poster

14 Years Ago

I am non quite sure that I sympathise what you lot are trying to say hither but if you are worried about the number of characters displayed per line on your console window, information technology depends on the properties of the console window (OS specific) and has got nothing to practice with your programme. For e.thou. in Windows you can set the properties of the console window similar Screen buffer and window size to increase / display the number of characters displayed.

If still in doubt, post the code forth with the varying output you are talking nigh.

~s.o.s~ 2,560 Failure equally a human Team Colleague Featured Poster