为什么这样写会出现OutOfMemory错误，而第二段那样写就不会？
URL url = new URL(urlStr); HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); BufferedReader buffer = new BufferedReader(new InputStreamReader(urlConn.getInputStream())); line = buffer.readLine(); while(line != null){ sb.append(line); }URL url = new URL(urlStr); HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); BufferedReader buffer = new BufferedReader(new InputStreamReader(urlConn.getInputStream())); while ((line = buffer.readLine()) != null) { sb.append(line); }
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
第一段：
line 的值始终不变，这是一个死循环，所以 sb 会越来越大。
第二段：
line 的值会不断改变，最后读到流的末尾，
readLine()会返回null，于是循环结束。