ObjectOutputStream类flush()方法 (ObjectOutputStream Class flush() method)

• 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...

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