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
     
       words = new ArrayList<>();    public ArrayList
      
        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;    }}