DataOutputStream类flush()方法 (DataOutputStream 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 forces bytes to be written to the basic stream.

  flush()方法用于刷新此流，并强制将字节写入基本流。

• 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.

  IOException ：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 the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example // of void flush() method of DataOutputStreamimport java.io.*;public class FlushOfDOS {
    public static void main(String[] args) throws IOException {
     InputStream is_stm = null;  DataInputStream dis_stm = null;  FileOutputStream fos_stm = null;  DataOutputStream dos_stm = null;  byte[] b_arr = {
      12,   20,   45,   98,   75,   69,   30,   58,   47,   61,   83,   55  };  try {
      // Instantiate FileInputStream,    // DataInputStream, FileOutputStream   // and DataOutputStream    fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");   dos_stm = new DataOutputStream(fos_stm);   is_stm = new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");   dis_stm = new DataInputStream(is_stm);   // Loop to write each byte till end   for (byte val: b_arr) {
       // By using write() method isto    // write a byte value to the    // DataOutputStream dos_stm    dos_stm.write(val);   }   // By using flush() method isto   // flush the stream and forces bytes   // are written out immediately of any    // buffered output   dos_stm.flush();   // Loop To Read Available Data till end   while (dis_stm.available() > 0) {
       // By using read() method isto read     // byte from dis_stm    int in = dis_stm.read();    System.out.println("dis_stm.read(): " + in );   }  } catch (Exception ex) {
      System.out.println(ex.toString());  } finally {
      // To free system resources linked   // with these streams   if (is_stm != null)    is_stm.close();   if (dis_stm != null)    dis_stm.close();   if (dos_stm != null)    dos_stm.close();   if (fos_stm != null)    fos_stm.close();  } }}

Output

输出量

dis_stm.read(): 12dis_stm.read(): 20dis_stm.read(): 45dis_stm.read(): 98dis_stm.read(): 75dis_stm.read(): 69dis_stm.read(): 30dis_stm.read(): 58dis_stm.read(): 47dis_stm.read(): 61dis_stm.read(): 83dis_stm.read(): 55

翻译自: