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 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
输出量
Sync() executed
翻译自: https://www.includehelp.com/java/filedescriptor-sync-method-with-example.aspx
应用)
