將a.txt文件中的單詞與b.txt文件中的單詞交替合併到c.txt文件中，a.txt文件中的單詞用回車符分隔，b.txt文件中用回車或空格進行分隔

package cn.javase.util;
 

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class MainClass{
 public static void main(String[] args) throws Exception{
  FileManager a = new FileManager("D:/a.txt",new char[]{'\n'});
  FileManager b = new FileManager("D:/b.txt",new char[]{'\n',' '});  
  FileWriter c = new FileWriter("D:/c.txt");
  String aWord = null;
  String bWord = null;
  while((aWord = a.nextWord()) !=null ){
   c.write(aWord + "\n");
   bWord = b.nextWord();
   if(bWord != null)
    c.write(bWord + "\n");
  }
  
  while((bWord = b.nextWord()) != null){
   c.write(bWord + "\n");
  } 
  c.close();
 }
 
}

class FileManager{

 String[] words = null;
 int pos = 0;
 public FileManager(String filename,char[] seperators) throws Exception{
  File f = new File(filename);
  FileReader reader = new FileReader(f);
  char[] buf = new char[(int)f.length()];
  int len = reader.read(buf);
  String results = new String(buf,0,len);
  String regex = null;
  if(seperators.length >1 ){
   regex = "" + seperators[0] + "|" + seperators[1];
  }else{
   regex = "" + seperators[0];
  }
  words = results.split(regex);
 }
 
 public String nextWord(){
  if(pos == words.length)
   return null;
  return words[pos++];
 }

}