这篇文章主要讲解了IO中如何使用flush()函数,内容清晰明了,对此有兴趣的小伙伴可以学习一下,相信大家阅读完之后会有帮助。
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”。
看完上述内容,是不是对IO中如何使用flush()函数有进一步的了解,如果还想学习更多内容,欢迎关注亿速云行业资讯频道。
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