24日学习笔记：
//导入包和抛出错误不写了，下面是具体的代码
FileInputStream in = new FileInputStream("d:/demo.txt"); //原
FileOutputStream out = new FileOutputStream("d:/demo2.txt");//目标
//缓冲流必须依赖其它流作为构造器参数
BufferedInputStream bis = new BufferedInputStream(in);
BufferedOutputStream bos = new BufferedOutputStream(out);
int b;
while((b=bis.read())!=-1) {
bos.write(b);
}
//依次写入，
//使用高级流，关闭高级就可以关闭所有
bis.close();
bos.close();
