FileDescriptor类sync()方法 (FileDescriptor Class sync() method)

• sync() method is available in java.io package.

  sync()方法在java.io包中可用。

• sync() method is used to synchronize all the system buffer with the underlying device.

  sync()方法用于将所有系统缓冲区与基础设备同步。

• sync() 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.

  sync()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。

• sync() method may throw an exception at the time of synchronizing.

  sync()方法在同步时可能会引发异常。

  SyncFailedException: This exception may throw when the buffer cannot be flushed or the system cannot be sure synchronization of all the buffers with the underlying device.

  SyncFailedException ：当无法刷新缓冲区或系统无法确保所有缓冲区与基础设备同步时，可能引发此异常。

Syntax:

句法：

public void sync();

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 sync() method of FileDescriptorimport java.io.*;public class SyncOfFD {
    public static void main(String[] args) throws Exception {
     FileOutputStream os_stm = null;  try {
      // Instantiates FileOutputStream    os_stm = new FileOutputStream("D:\\includehelp.txt");   // By using getFD() method is to get   // the file descriptor   FileDescriptor file_des = os_stm.getFD();   // By using write() method is to   // write corresponding char 'A' to   // the output stream os_stm    os_stm.write(65);   // By using sync() method is to   // sync the data to the file   file_des.sync();   System.out.println("Sync() executed ");  } catch (Exception ex) {
      System.out.println(ex.toString());  } finally {
      // with the help of this block is to   // free all necessary resources linked   // with the stream   if (os_stm != null) {
       os_stm.close();   }  } }}

Output

输出量

Sync() executed

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