/*
Written by Jen Chen 
Updated on 01/7/05
*/

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

public class IO_AppendToFile {
  public static void main(String[] args) throws IOException{
  String file = "URL.htm";
  String dir = "C:\\jen\\Temp\\FileIO_1";
  File inFile = new File(file);
  File myDir = new File(dir);
  BufferedReader fbuf = null;
  int linenum = 0;
  String line;

    File output = new File(dir,"output.txt");
    output.createNewFile();  //create a new file if necessary.
    BufferedWriter out = new BufferedWriter(new FileWriter(output));

  try{
    fbuf = new BufferedReader(new FileReader(file));
    line = fbuf.readLine();
    while(line != null){
      linenum++;
      out.write(line + "\n");
      line = fbuf.readLine();
    }
    }
  catch(Exception e) { System.out.println(e); }

if(fbuf != null)
  try{ fbuf.close();
  } catch(Exception e){}

  out.close();

  //Now we append to the end of the file output.txt by specifying the 2nd parameter of the
  //FileWriter() constructor to be "true".
  //We will append

  File fileout = new File(dir,"output.txt");

  fileout.createNewFile();
  BufferedWriter out2 = new BufferedWriter(new FileWriter(fileout.getPath(), true));
    out2.write("Get the absolute path of the given file, then append this path to the end " +
    		    "of the file output.txt\n");
    out2.write(fileout.getAbsolutePath() + "\n");

    out2.write("Get the directory's name of this file then append this path to the end of the file output.txt" + "\n");
    out2.write(fileout.getParent() + "\n");

    out2.write("Listing the contents of the current directory, then append the results to " +
    			"the file output.txt\n");
	   String st[] = myDir.list();
	for(int i = 0; i < st.length; i++)
		out2.write("\t" + st[i] + "\n");

    out2.write("Listing the contents of the current directory, then filtering out all files except those end " +
    			"with the .java suffix, then append the results to " + "the file output.txt\n");
	FilenameFilter filter = new FilenameFilter() {
        public boolean accept(File myDir, String name) {
            return name.endsWith(".java");
        }
    };
	   String st2[] = myDir.list(filter);
	for(int i = 0; i < st2.length; i++)
		out2.write("\t" + st2[i] + "\n");

  out2.close();
  //fileout.deleteOnExit();

  }//end of main()
}//end of class IO_1{}