RandomAccessFile類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()方法用于獲取RandomAccessFile流中的當前指針。

• 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()方法是一個非靜態方法，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。

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

  返回文件指針時， getFilePointer()方法不會引發異常。

Syntax:

句法：

    public long getFilePointer();

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

此方法的返回類型為long ，它從發生下一次讀取或寫入的文件的開頭返回指針。

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

輸出量

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

翻譯自: https://www.includehelp.com/java/randomaccessfile-getfilepointer-method-with-example.aspx