flush() method is available in java.io package.
flush()方法在java.io包中可用。
flush() method is used to flush this stream and write bytes immediately of any buffered output to the underlying stream.
flush()方法用于刷新此流，并将任何缓冲输出的字节立即写入基础流。
flush() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
flush()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
flush() method may throw an exception at the time of flushing the stream.
flush()方法在刷新流时可能会引发异常。
IOException: This exception may throw when getting any input/output error while writing to the output stream.
IOException ：在写入输出流时遇到任何输入/输出错误时，可能引发此异常。
Syntax:
句法：
public void flush();Parameter(s):
参数：
It does not accept any parameter.
它不接受任何参数。
Return value:
返回值：
The return type of this method is void, it returns nothing.
此方法的返回类型为void ，不返回任何内容。
Example:
例：
// Java program to demonstrate the example // of void flush() method of ObjectOutputStreamimport java.io.*;public class FlushOfOOS { public static void main(String[] args) throws Exception { // Instantiates ObjectOutputStream , ObjectInputStream // FileInputStream and FileOutputStream FileOutputStream file_out_stm = new FileOutputStream("D:\includehelp.txt"); ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm); FileInputStream file_in_stm = new FileInputStream("D:\includehelp.txt"); ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm); // By using writeByte() method is to // write byte to the stream obj_out_stm.writeByte(65); // By using flush() method is to // flush the stream immediately System.out.println("Stream Flushed..."); obj_out_stm.flush(); // By using readByte() method is to // read the byte and convert it into // char char ch = (char) obj_in_stm.read(); System.out.println("ch: " + ch + " "); // By using close() method is to // close all the streams System.out.println("Stream Shutdown... "); file_in_stm.close(); file_out_stm.close(); obj_in_stm.close(); obj_out_stm.close(); }}Output
输出量
Stream Flushed...ch: A Stream Shutdown...翻译自: https://www.includehelp.com/java/objectoutputstream-flush-method-with-example.aspx