1、编写程序，使用FileInputStream和FileOutputStream实现将D盘test文件夹中的test.txt文件复制到D盘det文件夹中；test.txt的内容是程序通过随机生成10个随机数来形成的。

2、编写程序，将题目1改为使用缓冲区完成文件拷贝。

3、编写程序，使用BufferedReader和BufferedWriter实现将D盘test文件夹中的test.txt文件复制到D盘det文件夹中；test.txt的内容是您未来职业意向（通过键盘录入并存放到test.txt文件）。

package test.pta.Student.wj;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

public class Main1 {
    public static void main(String[] args) throws IOException {
        // 创建FileInputStream对象用于读取原文件
        File f=new File("D:\\test");
        File f1=new File("D:\\det\\");
        File f2=new File("D:\\test\\test.txt");
        if(!f.exists()) {
            f.mkdir();
            //f=new File("D:\\test");
        }
        if(!f1.exists()) {
            f1.mkdir();
        }
        /*  if(!f2.exists()) {
              f2.createNewFile();
             }*/
        FileOutputStream fos = new FileOutputStream("D:\\test\\test.txt");
        FileInputStream fis = new FileInputStream("D:\\test\\test.txt");// 创建FileOutputStream对象用于写入新文件
        FileOutputStream fos1 = new FileOutputStream("D:\\det\\test.txt");
        FileInputStream fis1 = new FileInputStream("D:\\det\\test.txt");
        for (int i = 0; i <10 ; i++) {
            fos.write(String.valueOf(new Random().nextInt(10)).getBytes());
        }
        System.out.println("D:\\test\\test.txt 写入成功");
        int read;
        System.out.println("D:\\test\\test.txt中的内容：");
        while ((read = fis.read()) != -1) {
            fos1.write(read);
            System.out.print((char)read);
        }
        System.out.println("\nD:\\test\\test.txt 复制到D:\\det\\test.txt成功");
        System.out.println("D:\\det\\test.txt中的内容：");
        while ((read = fis1.read()) != -1) {
            System.out.print((char)read);
        }

        // 关闭流
        fis.close();
        fos.close();
    }
}

package test.pta.Student.wj;

import java.io.*;
public class Main2 {
    public static void main(String[] args)  throws IOException {
        // 创建BufferedInputStream和BufferedOutputStream对象
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\test\\test.txt"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:\\det\\test.txt"));
        BufferedInputStream bis1 = new BufferedInputStream(new FileInputStream("D:\\det\\test.txt"));
        System.out.println("D:\\test\\test.txt中的内容：");
        int read;
        while ((read = bis.read()) != -1) {
            bos.write(read);
            System.out.print((char)read);
        }
        // 关闭流
        bis.close();
        bos.close();
        System.out.println("\nD:\\test\\test.txt 复制到D:\\det\\test.txt成功");
        System.out.println("D:\\det\\test.txt中的内容：");
        int q;
        //System.out.println(bis1.read());
        while ((q = bis1.read()) != -1) {
            System.out.print((char)q);
        }
        // 关闭流
        bis1.close();
    }
}

package test.pta.Student.wj;

import java.io.*;
public class Main3 {
    public static void main(String[] args) throws IOException {
        // 创建BufferedReader用于从键盘录入数据
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("请输入您的未来职业意向");
        String jobIntent = br.readLine();
        // 将录入的数据写入到test.txt文件中
        BufferedWriter bw1 = new BufferedWriter(new FileWriter("D:\\test\\test.txt"));
        bw1.write(jobIntent);
        bw1.close();
        // 创建BufferedReader用于读取test.txt文件的内容
        BufferedReader br1 = new BufferedReader(new FileReader("D:\\test\\test.txt"));
        // 创建BufferedWriter用于将读取的内容写入到新的文件中
        BufferedWriter bw2 = new BufferedWriter(new FileWriter("D:\\det\\test.txt"));
        // 读取和写入操作
        String line;
        while ((line = br1.readLine()) != null) {
            bw2.write(line);
            bw2.newLine(); // 写入换行符，实现与原文件相同的格式
        }
        // 关闭资源
        br1.close();
        bw2.close();
        System.out.println("文件复制成功！");
    }
}