package test;import java.io.BufferedWriter;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.Scanner;public class test1 {    public static void main(String[] args) throws IOException {        File file = new File("D:\\input.txt");        if (!file.exists()) {            System.out.println("文件不存在");            return;                }        String[] strs=new String[99999999];        Scanner x = new Scanner(file);        int i=0;        boolean flag=false;        while(x.hasNextLine()) {            String[] str=x.nextLine().split("\\W+");            for(int ms=0;ms
     
      2) {                    flag=false;                    if(i!=0) {                        for(int t=0;t
      
       max.length()) {                    max = sentence;                }//                System.out.println(sentence);            }                    }        File w = new File("D://output.txt");         w.createNewFile(); // 创建新文件        BufferedWriter out = new BufferedWriter(new FileWriter(w));        out.write(max); // \r\n即为换行        out.flush(); // 把缓存区内容压入文件        out.close(); // 最后记得关闭文件                if(max.length()!=0) {            System.out.println(max);        }else {            System.out.println("没有首尾相连");        }            }}
      
     

读取文件为input.txt  输出文件为output.txt.