面试题1

package com.maoge;

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

public class  {
    public static void main(String []args)throws IOException{
        char[] ca = new char[]{'n'};
        char[] cb = new char[]{'n',' '};
        FileManager a = new FileManager("D:\IDEA\workspace\file\a.txt",ca);
        FileManager b = new FileManager("D:\IDEA\workspace\file\b.txt",cb);
        FileWriter fw = new FileWriter("D:\IDEA\workspace\file\c.txt");
        String aword = null;
        String bword = null;
        while ((aword=a.nextWord())!=null){
            fw.write(aword+"n");

            if ((bword=b.nextWord())!=null){
                fw.write(bword+"n");
            }
        }

        while ((bword=b.nextWord())!=null){
            fw.write(bword+"n");
        }

        fw.close();
    }

   static class FileManager{
       String words[] = null;
       int position = 0;

       public FileManager(String f, char[] c)throws IOException {
           File file = new File(f);
           FileReader reader = new FileReader(file);
           char[] buf = new char[(int)file.length()];
           int len = reader.read(buf);
           String result = new String(buf,0,len);

           String regex = null;
           if(c.length==1){
               regex = ""+c[0];
           }else {
               regex = ""+c[0]+"|"+c[1];
           }

           words = result.split(regex);
       }

       public String  nextWord(){
            if(position==words.length){
                return null;
            }else {
                return words[position++];
            }
       }

   }

}