文件按照要求合并（Java）

编写一个程序，将a.txt文件中的单词与b.txt文件中的单词交替合并到c.txt文件中，a.txt文件中的单词用回车符分隔，b.txt文件中用回车或空格进行分开

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("a.txt",new char[]{'\n'});
		FileManager b = new FileManager("b.txt",new char[]{'\n',' '});		
		FileWriter c = new FileWriter("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++];
	}
}