RandomAccessFile类getFilePointer()方法 (RandomAccessFile Class getFilePointer() method)

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

  getFilePointer()方法在java.io包中可用。

• getFilePointer() method is used to get the current pointer in the RandomAccessFile stream.

  getFilePointer()方法用于获取RandomAccessFile流中的当前指针。

• getFilePointer() 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.

  getFilePointer()方法是一个非静态方法，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。

• getFilePointer() method does not throw an exception at the time of returning file pointer.

  返回文件指针时， getFilePointer()方法不会引发异常。

Syntax:

句法：

    public long getFilePointer();

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 long, it returns the pointer from the starting of the file at which the next read or write happens.

此方法的返回类型为long ，它从发生下一次读取或写入的文件的开头返回指针。

Example:

例：

// Java program to demonstrate the example 
// of long getFilePointer() method of
// RandomAccessFile
import java.io.*;
class RAFGetFilePointer {
public static void main(String[] args) throws Exception {
// Instantiate a random access file
// object with file name and permissions
RandomAccessFile ra_f = new RandomAccessFile("e:/includehelp.txt", "rw");
// By using writeUTF() method is to 
// write data in the file
ra_f.writeUTF("Welcome, in Java World!!!");
// Initially set the file pointer
// is at 0 for reading the file
ra_f.seek(0);
// To read file content by using
// readUTF()
System.out.println("ra_f .readUTF(): " + ra_f.readUTF());
// By using getFilePointer() method is to
// return the file pointer in bytes at which
// the next read/write occurs
System.out.println("ra_f.getFilePointer(): " + ra_f.getFilePointer());
// By using close() method isto
// close this stream ran_f
ra_f.close();
}
}

Output

输出量

ra_f .readUTF(): Welcome, in Java World!!!
ra_f.getFilePointer(): 27

翻译自: https://www.includehelp.com/java/randomaccessfile-getfilepointer-method-with-example.aspx