审查输入文本文件并将其写入输出文本文件

Question

I'm writing a program that inputs a list of words and a list of banned words. It will then "censor" the original list of words by changing any banned word in that file to asterisks. Finally, it will write the censored list of words into an output file. This is what I have so far

import java.util.*;
import java.io.*;

public class Assignment_5 {
public static void main(String[] args) {
   try{
  ArrayList<String> bWords = new ArrayList<String>();
  ArrayList<String> words = new ArrayList<String>();
  Scanner sc = new Scanner(new FileInputStream ("banned.txt"));
  PrintWriter pw = new PrintWriter ("output.txt");
  while(sc.hasNext()){
    bWords.add(sc.next());
  }
  sc = new Scanner(new FileInputStream("input.txt"));
  while (sc.hasNext())
    words.add(sc.next());

  String replacement = "test";
  for (int i = 0; i < words.size(); i++){
    for (int j = 0; j < bWords.size(); j++){
      if (words.get(i).compareTo(bWords.get(j)) == 0){
        for (int k = 0; k < words.get(i).length(); k++)
          replacement = "*";
        words.set(i, replacement);
        replacement = ""; 
      } 
    }

    for(i=0; i< words.size(); i++){
         pw.println(words.get(i));
        }
        pw.close();
     }
   }
   catch(Exception e){
     System.out.println(e.toString());
   }

It compiles fine and it creates an "output.txt" file, but the file is blank. I can't seem to figure out why it won't work. Any help would be great

UDPATE: It now prints out because I added a for loop in front of the PrintWriter (updated in code), but now it's only printing out the input, and not the censored input

Answer 1

PrintWriter pw = new PrintWriter ("output.txt");

this line in code is rewriting the file again and again. what you can do is put this out of loop. Also don't forget to close the stream after end of loop.

pw.close()