Count total number of occurences of a String in a text file

/**
Count total number of occurrences of a String and print the line numbers that have
matched the user "search criteria"

Searching for "good bye" is hardcoded in this file
*/

import java.io.File;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.StringTokenizer;

public class WordCounter {
public static void main(String args[]) throws Exception {
if(args.length != 1) {
System.out.println("Invalid number of arguments!");
return;
}
String sourcefile = args[0];
String searchFor = "good bye";
int searchLength=searchFor.length();
String thisLine;
try {
BufferedReader bout = new BufferedReader (new FileReader (sourcefile));
String ffline = null;
int lcnt = 0;
int searchCount = 0;
while ((ffline = bout.readLine()) != null) {
lcnt++;
for(int searchIndex=0;searchIndex int index=ffline.indexOf(searchFor,searchIndex);
if(index!=-1) {
System.out.println("Line number " + lcnt);
searchCount++;
searchIndex+=index+searchLength;
} else {
break;
}
}
}
System.out.println("SearchCount = "+searchCount);
} catch(Exception e) {
System.out.println(e);
}
}
}