Java File I/O - Text File - How to check for content?

Question

I was wondering, If i had a java class, that wanted to consult a txt file with say a list of names like

tom steve jones

how could i open the text file in the java program and basically see if a string contained in the program matches one of these names?

so far i have come up with

 try { BufferedReader inputReader = new BufferedReader(new FileReader("users.txt")); while (inputReader.readLine() != null){ } } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException ep) { // TODO Auto-generated catch block p.printStackTrace(); }

but do not no where to go from here..

danben · Accepted Answer · 2010-02-24 19:12:58Z

3

You need to store the result of readLine(), like:

String nextLine; while ((nextLine = inputReader.readLine()) != null){ if (nextLine.equals(stringToCheck)) { //do something } }

(where stringToCheck is the target string, of course.)

answered Feb 24, 2010 at 19:12

danben

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2 Comments

Karussell Over a year ago

+1. my two cents: equals, equalsIgnoreCase, contains or even regular expressions via Pattern.compile are your friends for string-matching

BalusC Over a year ago

Maybe it contained whitespace. Just call trim() before equals(). I.e. if (nextLine.trim().equals(stringToCheck)) {}

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