import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;public class Lane4 {public static void main(String[] args) throws IOException {String filename ="C:\\input.txt";File  a=new  File(filename);//judeFileExists(a);if(judeFileExists(a)){danci(filename);}else{}}public static void danci(String s) throws IOException {BufferedReader br = new BufferedReader(new FileReader(s));StringBuffer sb = new StringBuffer();String text = null;while ((text = br.readLine()) != null) {sb.append(text);}br.close();String str = sb.toString().toLowerCase();String[] words = str.split("[^(a-zA-Z)]+");StringBuffer yao = new StringBuffer();String b1=words[0];yao.append(b1);yao.append(" ");//System.out.println(b1);String end=b1.substring(b1.length()-1,b1.length());//System.out.println(end);for(int i=1;i<words.length;i++){ String start=words[i].substring(0,1);if(end.equals(start)){end=words[i].substring(words[i].length()-1,words[i].length());yao.append(words[i]);yao.append(" ");}}// for( String a:words)// {//  System.out.println(a);//   }//  System.out.println(yao.toString());File file =new File("C:\\output.txt");try {file.createNewFile();} catch (IOException e) {e.printStackTrace();     }try {FileWriter fw =new FileWriter(file);fw.write(yao.toString());fw.flush();fw.close();}catch (IOException e) {e.printStackTrace();     }}public static boolean judeFileExists(File file) {if (file.exists()) {System.out.println("查看输出文件");return true;} else {System.out.println("不存在");return false;}
}public static void judeDirExists(File file) {if (file.exists()) {if (file.isDirectory()) {System.out.println("dir exists");} else {System.out.println("the same name file exists, can not create dir");}} else {System.out.println("dir not exists, create it ...");file.mkdir();}}
}