FileDescriptor類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()方法用于將所有系統緩沖區與基礎設備同步。

• 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()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

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

  sync()方法在同步時可能會引發異常。

  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 ：當無法刷新緩沖區或系統無法確保所有緩沖區與基礎設備同步時，可能引發此異常。

Syntax:

句法：

    public void sync();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is void, it returns nothing.

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example 
// of void sync() method of FileDescriptor
import 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

輸出量

Sync() executed

翻譯自: https://www.includehelp.com/java/filedescriptor-sync-method-with-example.aspx