0927-----homework

/**
  *homework0926
  *@author:kai li
  */
package com.kai.li.homework0927;
import java.util.List;
import java.util.ArrayList;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.nio.charset.Charset;
import java.util.Scanner;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.File;
/**
  *following class is client 
  */
public class HomeWork0927{
    public static void main(String[] args)throws Exception{
        
        /**
          *question one
          */

        /*create data source*/

    String fileTarget="d:/text1.txt";
    List<String> lines=new ArrayList<>();
    lines.add("学号：17，姓名：小八。");
    lines.add("学号：18，姓名：小七。");
    
    /*write and read to a file*/
    
    //write 
    Files.write(Paths.get(fileTarget),lines,Charset.defaultCharset(),StandardOpenOption.CREATE);
    System.out.println("write is success");
    //read
    byte[] contentBytes=Files.readAllBytes(Paths.get(fileTarget));
    System.out.println(new String(contentBytes));

    /**
      *question two
      */
    
    //read
    byte[] contentBytes2=Files.readAllBytes(Paths.get(fileTarget));
    //input scanner
    System.out.println("please input file name");
    Scanner scanner=new Scanner(System.in);
    String txtName=scanner.nextLine();
    //write
    String fileTarget2="d:/"+txtName;
    Files.write(Paths.get(fileTarget2),contentBytes2,StandardOpenOption.CREATE);
    System.out.println("write is success");

    /**
      *question three
      */
    
    BufferedReader br=new BufferedReader(new FileReader(fileTarget2));
    String contentFileName=br.readLine();
    File file=new File(fileTarget2);
    File target=new File("e:/"+contentFileName+".txt");
    file.renameTo(target);
    System.out.println("move success");
    }
}