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Open file, read line by line, do string manipulation
Strings example from a Well House Consultants training course
More on Strings [link]
Source code: Vest.java Module: J707
import java.io.*;
/* Open file, read line by line, do string manipulation Some basic string handling functions and also some file stuff (which comes up in more detail later) so that you can get a really practical feel for a real job that's doing something quite straightforward to a heavy flow of data */ public class Vest { public static void main (String [] args) throws FileNotFoundException, IOException { // String handling basics - run a method on a string String Copyright = "This is mine and you SHUNNAE touch"; System.out.println(Copyright.toLowerCase()); // String handling basics - echo command line params for (int k=0; k<args.length; k++) { System.out.println(args[k]); } // String handling basics - read (and echo) whole file int countplace = 0, countlines = 0; int iptop; String RemoteIp; BufferedReader Suck = new BufferedReader(new FileReader(args[0])); String Stuff; while ((Stuff = Suck.readLine()) != null) { // String handling basics - look for one string in another countlines ++; iptop = Stuff.indexOf(" "); RemoteIp = Stuff.substring(0,iptop); if (Stuff.indexOf("Swindon") >= 0) { System.out.println(RemoteIp); countplace++; } } // Print out summary report too System.out.println("Total " + countlines); System.out.println("Matched " + countplace); } } /* Sample Output wizard:jn10 graham$ java Vest ac_20101103 this is mine and you shunnae touch ac_20101103 66.249.66.174 66.249.66.174 67.195.112.232 66.249.66.174 66.249.66.174 66.249.66.174 66.249.66.174 66.249.66.174 66.249.66.174 66.249.66.174 193.47.80.37 217.160.182.81 62.189.77.47 62.189.77.47 62.189.77.47 62.189.77.47 67.195.112.232 66.249.65.99 67.195.112.232 189.32.14.180 67.195.112.232 67.195.112.232 67.195.115.231 220.181.94.224 67.195.112.232 66.249.65.99 81.52.143.36 86.45.252.202 86.45.252.202 86.45.252.202 195.42.102.21 66.249.65.118 208.115.111.250 66.249.65.65 207.46.13.42 24.226.108.128 24.226.108.128 24.226.108.128 24.226.108.128 24.226.108.128 207.46.13.136 217.160.182.81 66.249.65.65 Total 159715 Matched 43 wizard:jn10 graham$ */ Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in Java * Java Bootcamp * Java Programming for the Web Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Strings" training module. You'll find a description of the topic and some
other closely related examples on the "Strings" module index page.
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