Please help me with the homework given to me by my teacher

Question

hello,i am new in java programming please help me with the home work given to me by my teacher at school, help me to build an interface that can work with this code.i can build an interface but i dont just understand this code.
//references:
//http://forums.techguy.org/development/570048-need-write-java-program-convert.html
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.FileReader;
public class Translate
  public static void main(String [] args) throws IOException
    if (args.length != 2)
      System.err.println("usage: Translate wordmapfile textfile");
      System.exit(1);
    try
      HashMap words = ReadHashMapFromFile(args[0]);
      System.out.println(ProcessFile(words, args[1]));
catch (Exception e)
      e.printStackTrace();
  // static helper methods
   * Reads a file into a HashMap. The file should contain lines of the format
   *    "key\tvalue\n"
   * @returns a hashmap of the given file
  @SuppressWarnings("unchecked")
  private static HashMap ReadHashMapFromFile(String filename) throws FileNotFoundException, IOException
    BufferedReader in = null;
    HashMap map = null;
    try
      in = new BufferedReader(new FileReader(filename));
      String line;
      map = new HashMap();
      while ((line = in.readLine()) != null)
        String[] fields = line.split("\\t", 2);
        if (fields.length != 2) continue; //just ignore "invalid" lines
        map.put(fields[0], fields[1]);
finally
      if(in!=null) in.close(); //may throw IOException
    return(map); //returning a reference to local variable is safe in java (unlike C/C++)
   * Process the given file
   * @returns String contains the whole file.
  private static String ProcessFile(Map words, String filename) throws FileNotFoundException, IOException {
    BufferedReader in = null;
    StringBuffer out = null;
    try {
      in = new BufferedReader(new FileReader(filename));
      out = new StringBuffer();
      String line = null;
      while( (line=in.readLine()) != null ) {
        out.append(SearchAndReplaceWordsInText(words, line)+"\n");
    } finally {
      if(in!=null) in.close(); //may throw IOException
    return out.toString();
   * Replaces all occurrences in text of each key in words with it's value.
   * @returns String
  private static String SearchAndReplaceWordsInText(Map words, String text) {
    Iterator it = words.keySet().iterator();
    while( it.hasNext() ) {
      String key = (String)it.next();
      text = text.replaceAll("\\b"+key+"\\b", (String)words.get(key));
    return text;
   * @returns: s with the first letter capitalized
  String capitalize(String s)
    return s.substring(0,0).toUpperCase() + s.substring(1);
}... here's the head of my pirate_words_map.txt
hello     ahoy
hi     yo-ho-ho
pardon me     avast
excuse me     arrr
yes     aye
my     me
friend     me bucko
sir     matey
madam     proud beauty
miss     comely wench
stranger     scurvy dog
officer     foul blaggart
where     whar
is     be
are     be
am     be
the     th'
you     ye
your     yer
tell     be tellin'

Answer 1

Heres your answer. Run it in on your pc.
public class Annoy
public static void main(String[] args)
   System.out.println("I am a triple poster.");
   System.out.println("I can not understand why I can not understand the help I have receved to date on the java forums.");
}