SwearWordRemover.java

import java.io.File;
import java.io.IOException;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.FileWriter;
import java.io.BufferedWriter;

public class SwearWordRemover {

    /*
     *  Program: SwearWordRemover.java
     *  Purpose: Remove swear words from file, replace them with blanked-out versions of the words.
     *  Creator: Chris Clarke
     *  Created: 07.01.2016
     */

/*

Required: a file called "swearwords.txt" containing the following words (or similar):

stupid s***i*
bloody bl**dy
fuck f**k
fucking f***ing
fucker f***er
arsehole a****ole
shit sh*t
shite sh*t*
twat tw*t
cunt c*nt
prick pr**k
wanker w**k*r
pissed pi**ed
damn d*mn

Also required: make a test file: "SwearTestData.txt" which includes swearwords.

Note that the output is sent to file "output.txt".

*/

    public static String[] openFile(String path) throws IOException {
        int numberOfLines = readLines(path);

        FileReader fr = new FileReader(path);
        BufferedReader textReader = new BufferedReader(fr);

        String[] textData = new String[numberOfLines];

        int i;

        for(i=0; i < numberOfLines; i++) {
            textData[i] = textReader.readLine();
            //System.out.println(textData[i]);  // display line on screen
        }
        textReader.close();
        return textData;
    } // openFile()

    public static int readLines(String path) throws IOException {

        FileReader file_to_read = new FileReader(path);
        BufferedReader bf = new BufferedReader(file_to_read);

        String aLine;
        int numberOfLines = 0;

        while (( aLine = bf.readLine()) != null) {
            numberOfLines++;
        }
        bf.close();
        return numberOfLines;
    } // readLines()

    public static void main(String[] args) throws IOException {

        String[] data = openFile("SwearTestData.txt");
        String[] sweary = openFile("swearwords.txt");
        String[] wordsInput;
        String out = "", word="";
        char punct = ' '; // punctuation
        char firstLetter = ' ';
        String[] swearLine;
        boolean foundSwear;

        for (int i=0; i<data.length; i++) {
            wordsInput = data[i].split(" ");
            for (int j=0; j<wordsInput.length; j++) {
                word = wordsInput[j];
                punct = ' ';
                if (word.endsWith(",") || word.endsWith(".") || word.endsWith(";")
                 || word.endsWith(":") || word.endsWith("?") || word.endsWith("!")) {
                    punct = word.charAt(word.length()-1);
                    word = word.substring(0, word.length()-1);
                } // if
                foundSwear = false;
                if (Character.isUpperCase (word.charAt(0))) {
                    firstLetter = word.charAt(0);
                } else {
                    firstLetter = ' ';
                } // if
                for (int k=0; k<sweary.length; k++) {
                    swearLine = sweary[k].split(" ");
                    if (word.equalsIgnoreCase(swearLine[0])) {
                        foundSwear = true;
                        if (firstLetter==' ') {
                            out += swearLine[1]+punct;
                        } else {
                            out += firstLetter+swearLine[1].substring(1, word.length())+punct;
                        } // if
                    } // if
                } // for k
                if (!foundSwear) {
                    if (firstLetter==' ') {
                        out += word+punct;
                    } else {
                        out += firstLetter+word.substring(1, word.length())+punct;
                    } // if
                } // if
            } // for j
            out += "\r\n"; // (windows)
        } // for i

        BufferedWriter bw = new BufferedWriter(new FileWriter(new File("Output.txt")));
        bw.write(out);
        bw.close();
    } // main()

} // class SwearWordRemover