這篇文章主要講解了IO中如何使用flush()函數(shù)，內(nèi)容清晰明了，對(duì)此有興趣的小伙伴可以學(xué)習(xí)一下，相信大家閱讀完之后會(huì)有幫助。

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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();
	}
}

如上面代碼，如果flush()被注釋掉，則打印完“hello”之后3秒才會(huì)打印”writer start”，”writer close”，因?yàn)閣riter.close()在關(guān)閉輸出流前會(huì)調(diào)用一次flush()。效果如下：

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

看完上述內(nèi)容，是不是對(duì)IO中如何使用flush()函數(shù)有進(jìn)一步的了解，如果還想學(xué)習(xí)更多內(nèi)容，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。