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隔

答：

package cn.itcast;

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++];

}

}