java算法面试题：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 com.swift;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

public class IO_jiaoti {

    public static void main(String[] args) throws Exception {
        /*
         * 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。
         */

        BufferedReader br1 = new BufferedReader(
                new InputStreamReader(new FileInputStream("e:\\neck\\a.txt"), "gb2312"));
        BufferedReader br2 = new BufferedReader(
                new InputStreamReader(new FileInputStream("e:\\neck\\b.txt"), "gb2312"));
        BufferedWriter bw = new BufferedWriter(
                new OutputStreamWriter(new FileOutputStream("e:\\neck\\c.txt"), "gb2312"));
        List<String> list1 = new ArrayList<String>();
        List<String> list2 = new ArrayList<String>();
        List<String> list3 = new ArrayList<String>();

        String str1;
        while ((str1 = br1.readLine()) != null) {
            list1.add(str1);
        }

        StringBuffer sb = new StringBuffer();
        int len;
        char[] buf = new char[1024];
        while ((len = br2.read(buf)) != -1) {
            sb.append(buf, 0, len);
        }
        String[] bstr = sb.toString().split("\\s");
        for (String str : bstr) {
            System.out.println(str);
            if (str.matches("[a-zA-Z]{1,}")) {
                list2.add(str);
            }
        }

        if (list1.size() <= list2.size()) {
            for (int i = 0; i < list1.size(); i++) {
                list3.add(list1.get(i));
                list3.add(list2.get(i));
            }
            for(int i=list1.size();i<list2.size();i++) {
                list3.add(list2.get(i));
            }
        }else {
            for (int i = 0; i < list2.size(); i++) {
                list3.add(list1.get(i));
                list3.add(list2.get(i));
            }
            for(int i=list2.size();i<list1.size();i++) {
                list3.add(list1.get(i));
            }
        }
        for(String str:list3) {
            System.out.print(str+" ");
            bw.write(str);
            bw.write("\r\n");
            bw.flush();
        }
    }

}