Very complicated java prorgamming question(Based on Files and Streams)

timer Asked: Feb 10th, 2013

Question Description

create a copy of the code given above and name it copyfilter. modify the code so that it only writes lines into the output file (from the input file) if they contain a specific word or set of words (i.e. a specific string as part of the line). you may hard code this string to search for at first, but then work to make your program more flexible. hints: identify the part of the program where the line is written into the new file and modify it with a decision structure that only writes it if it contains the text we're looking for.

public class copyfilter {

public static void main(string args[]) {
//... get two file names from parameters on command line.
if (args.length != 2) {
system.err.println("usage: java copytextfile sourcefile targetfile");

//... create file objects.
file infile = new file(args[0]); // read from first file specified
file outfile = new file(args[1]); // write into second file

//... enclose in try..catch because of possible io exceptions.
try {
//... create reader and writer for text files.
bufferedreader reader = new bufferedreader(new filereader(infile));
bufferedwriter writer = new bufferedwriter(new filewriter(outfile));

//... loop as long as there are input lines.
string line = null;
while ((line=reader.readline()) != null) {
writer.newline(); // write system-dependent end of line.
//... close reader and writer.
reader.close(); // close to unlock.
writer.close(); // close to unlock and flush to disk.

} catch (ioexception e) {

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