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.
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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
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原文链接：http://blog.csdn.net/zhhtao89/article/details/50127851
