IO中flush()函数的使用代码示例
The java.io.Writer.flush() method flushes the stream. If the stream has saved any characters from the various write() methods in a buffer,write them immediately to their intended destination. Then,if that destination is another character or byte stream,flush it. Thus one flush() invocation will flush all the buffers in a chain of Writers and OutputStreams. public class Demo { public static void main(String[] ars) throws Exception { System.out.println("hello"); PrintWriter writer = new PrintWriter(System.out); writer.println("writer start"); // writer.flush(); try { Thread.sleep(3000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } writer.println("writer close"); writer.close(); } } 如上面代码,如果flush()被注释掉,则打印完“hello”之后3秒才会打印”writer start”,”writer close”,因为writer.close()在关闭输出流前会调用一次flush()。效果如下: 如果flush()没有被注释掉,则则打印完“hello”之后会立即打印”writer start”。 总结 以上就是本文关于IO中flush()函数的使用代码示例的全部内容,希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题,如有不足之处,欢迎留言指出。感谢朋友们对本站的支持! (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |