复制操作代码实现流程
public static void copyFile(File srcFile,File destFile)throws IOException{
if(!srcFile.exists()){
throw new IllegalArgumentException("文件:"+srcFile+"不存在");
}
if(!srcFile.isFile()){
throw new IllegalArgumentException(srcFile+"不是文件");
}
FileInputStream in = new FileInputStream(srcFile);
FileOutputStream out = new FileOutputStream(destFile);
byte[] buf = new byte[8*1024];
int b;
while((b=in.read(buf,0,buf.length))!=-1){
out.write(buf,0,b);
out.flush();
}
in.close();
out.close();
}谁能帮我讲一下这个是如何从srcFile中读取之后写到destFile中去的呢,我只看到了读的操作,写操作不是写到buf数组里了吗