采用字符缓冲输入流和字符缓冲输出流完成 Dwordatxt 复制到Ewordatxt分别采用一次读取一个字符的方式和一次读取一个字符数组的方式

1. 一次读取一个字符的方式：

import java.io.*;

public class CopyFile {
    public static void main(String[] args) {
        try (BufferedReader reader = new BufferedReader(new FileReader("D:\\word\\a.txt"));
             BufferedWriter writer = new BufferedWriter(new FileWriter("E:\\word\\a.txt"))) {

            int c;
            while ((c = reader.read()) != -1) {
                writer.write(c);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2. 一次读取一个字符数组的方式：

import java.io.*;

public class CopyFile {
    public static void main(String[] args) {
        try (BufferedReader reader = new BufferedReader(new FileReader("D:\\word\\a.txt"));
             BufferedWriter writer = new BufferedWriter(new FileWriter("E:\\word\\a.txt"))) {

            char[] buffer = new char[1024];
            int len;
            while ((len = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
``