寻找最长单词链

用JavaScript substring 方法比较相邻两个字符串的相邻字母，匹配相等则将字符串存入数组，否则继续往下比较。代码如下：

package jielong;

import java.io.BufferedWriter;
import java.io.IOException;
import java.util.ArrayList;

import jielong.MyFile;

public class FineWord
{
    public ArrayList<String> words = new ArrayList<>();
    public ArrayList<String> wordsList = new ArrayList<>();

    public boolean compare(String a, String b)
    {
        a = a.toLowerCase();
        b = b.toLowerCase();
        return (a.substring(a.length() - 1).equals(b.substring(0, 1)));
    }

    public void fileSplit(String path) throws Exception
    {
        MyFile file = new MyFile();
        String theFileString = file.get(path);
        if (theFileString == null)
        {
            return;
        }
        if (theFileString.equals(""))
        {
            throw new Exception("空文件");
        }
        for (String word : theFileString.split("\,|\，|\r|\n|\.| |\(|\)|\;|\:|"|\?|\!|\'|　　|\、|\”|\“"))
        {
            if (!word.equals(""))
            {
                words.add(word);
            }
        }
        if (words.size() <= 1)
        {
            throw new Exception("文件内单词过少（只有" + words.size() + "个词)");
        }
    }

    public void wordWrite(int index, String path) throws Exception
    {
        MyFile file = new MyFile();
        BufferedWriter bf = file.put(path);
        wordsList.add(words.get(index));

        try
        {
            for (String string : words)
            {
                if (compare(wordsList.get(wordsList.size() - 1), string))
                {
                    wordsList.add(string);
                    bf.append(string);
                    bf.newLine();
                }
            }
            bf.close();
        } catch (IOException e)
        {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }

        if (wordsList.size() <= 1)
        {
            throw new Exception("没有单词链");
        }
    }

    public static void main(String[] args)
    {
        FineWord aFineWord = new FineWord();
        try
        {
            aFineWord.fileSplit("D:\java/eclipse/word/123.txt");
            aFineWord.wordWrite(0, "D:\java/eclipse/word/output.txt");
            System.out.println(aFineWord.wordsList);
        } catch (IOException e)
        {
            System.out.println("无此文件");
        } catch (Exception e)
        {
            System.out.println(e.getMessage());
        }
    }
}

package jielong;

import java.io.*;
import java.nio.file.Paths;
import java.util.Scanner;

public class MyFile
{
    public String get(String path) throws IOException
    {
        Scanner in = null;
        String File = "";
        in = new Scanner(Paths.get(path));
        while (in.hasNextLine())
        {
            File += in.nextLine();
        }
        return File;
    }

    public BufferedWriter put(String path)
    {
        try
        {
            FileWriter f = null;
            BufferedWriter bf = null;
            try
            {
                f = new FileWriter(path);
                bf = new BufferedWriter(f);
            } catch (IOException e)
            {
                e.printStackTrace();
            }
            return bf;
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }
}