The javascript/60843.html">java.ios/298414.html">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();	}}

如上面代碼，如果flush()被注釋掉，則打印完“hello”之后3秒才會打印”writer start”，”writer close”，因為writer.close()在關閉輸出流前會調用一次flush()。效果如下：

如果flush()沒有被注釋掉，則則打印完“hello”之后會立即打印”writer start”。

總結

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