// 创建输入对象
BufferedReader br = new BufferedReader(new FileReader("C:\\Users\\22433\\Desktop\\io.txt"));
// 创建输出对象
BufferedWriter bw = new BufferedWriter(new FileWriter("C:\\Users\\22433\\Desktop\\io_copy.txt", true));
String line;
while ((line = br.readLine()) != null) {
bw.write(line);
bw.newLine(); // 换行
}
br.close();
bw.close();
System.out.println("已将io.txt中的数据复制进入io_copy.txt");