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// RandomAccessFileimport 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

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