import java.io.*;

import java.util.*;

public class TextFile extends ArrayList<String>{

public static String read(String fileName){

StringBuilder sb = new StringBuilder();

try{

BufferedReader in = new BufferedReader(new FileReader(new File(fileName).getAbsoluteFile()));

try{

String s;

while((s = in.readLine()) != null){

sb.append(s);

sb.append("\n");

}

}finally{

in.close();

}

}catch(IOException e){

throw new RuntimeException(e);

}

return sb.toString();

}

public static void write(String fileName, String text){

try{

PrintWriter out = new PrintWriter(new File(fileName).getAbsoluteFile());

try{

out.print(text);

}finally{

out.close();

}

}catch(IOException e){

throw new RuntimeException(e);

}

}

public TextFile(String fileName, String splitter){

super(Arrays.asList(read(fileName).split(splitter)));

if(get(0).equals("")){

remove(0);

}

}

public TextFile(String fileName){

this(fileName, "\n");

}

public void write(String fileName){

try{

PrintWriter out = new PrintWriter(new File(fileName).getAbsoluteFile());

try{

for(String item : this){

out.println(item);

}

}finally{

out.close();

}

}catch(IOException e){

throw new RuntimeException(e);

}

}

public static void main(String[] args){

String file = read("TextFile.java");

write("test.txt", file);

TextFile text = new TextFile("test.txt");

text.write("test2.txt");

TreeSet<String> words = new TreeSet<String>(

new TextFile("TextFile.java", "\\W+")

);

System.out.println(words.headSet("a"));

}

}