import java.io.*;				// for File and PrintWriter
import java.util.*;				// for Scanner

public class Ch14_11			// read each String of an input file and send it to an output file unless the String matches the word input by the user to be removed
{								// note:  as we are only fetching Strings that are delimited by blanks, we have to insert blanks after each word of the output file
								// and since the delimiter will include punctuation as "end of a string", we are looking for the word or the substring of the word without
								// looking at the last character (e.g., if we are looking to remove "dog", we would also remove "dog.", "dogs" and "dog!"
	public static void main(String[] args)
	{
		File f=null, f2=null;	// need to initialize s and p up here because of the finally clause. Java compiler complains if these are not initialized so I set them to null
		Scanner s=null, s2=null;	// don't want to set them to new... in case they throw an exception, we have to try to open the files within the try block to 
		PrintWriter p=null;			// catch any problem
		String word;			// the word that the user wants to delete from the file
		try{	
			f=new File("input.txt");		// obtain as a File both the input and the output files as f and f2
			f2=new File("output.txt");
			s=new Scanner(f);				// s is the Scanner used to control access to the input file
			s2=new Scanner(System.in);
			System.out.println("What word do you want removed from the file?");	// get the word to remove from the file from the user
			word=s2.next();
			p=new PrintWriter(f2);			// open the output file as p
			scanAndRemove(s, word, p);		// all of the removal action takes place in scanAndRemove
		}
		catch(IOException e)		// I/O error?  Catch it here
		{
			System.out.println(e);
		}
		finally						// whether an Exception arises or not, when done close both s and p
		{
			s.close();
			p.close();
		}
	}
	
	// this method will iterate through the file controlled by s, obtaining each String and comparing it to w, if the next String temp and w are the same or if temp minus the last character and w
		// are the same, do not output it to p, otherwise output temp to p
	public static void scanAndRemove(Scanner s, String w, PrintWriter p)
	{
		String temp;
		while(s.hasNext())			// does the file have more to it?  If so, continue
		{
			temp=s.next();			// get the next String from the file, Strings are delimited by spaces (since we did not override the default)
			if(!temp.equals(w)&&!temp.substring(0,temp.length()-1).equals(w)) p.print(temp+" ");
		}
	}
}