java算法与编程面试题(一)

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。

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++];
    }
}

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