RandomAccessFile類seek()方法 (RandomAccessFile Class seek() method)
seek() method is available in java.io package.
seek()方法在java.io包中可用。
seek() method is used to sets the file pointer position calculated from the starting of this file at which the next read or write operation occurs and the position might be set beyond the file.
seek()方法用于設置從該文件的開頭算起的文件指針位置，在該文件開始下一次讀取或寫入操作時，該位置可能會設置在文件之外。
seek() 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.
seek()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。
seek() method may throw an exception at the time of seeking file pointer.
seek()方法在查找文件指針時可能會引發異常。
IOException: This exception may throw an exception while performing input/output operation.
IOException ：在執行輸入/輸出操作時，此異常可能會引發異常。
Syntax:
句法：
public void seek(long pos);
Parameter(s):
參數：
long pos – represents the offset location at which to set file pointer, measured in bytes from the beginning of the file.
long pos –表示設置文件指針的偏移位置，以從文件開頭開始的字節數為單位。
Return value:
返回值：
The return type of this method is void, it returns nothing.
此方法的返回類型為void ，不返回任何內容。
Example:
例：
// Java program to demonstrate the example
// of void seek(long pos) method of
// RandomAccessFile
import java.io.*;
class RAFSeek {
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 to the file
ra_f.writeUTF("Welcome in Java World!!!");
// by using seek() method is to
// set the current file indicator
// from where read/write could
// start i.e. we set here 0 so reading
// will be done from 0 till EOF
ra_f.seek(0);
// By using readUTF() method is to
// read a data in a string from
// this file
//String str = ra_f.readUTF();
System.out.println("ra_f.readUTF(): " + ra_f.readUTF());
// By using close() method isto
// close this stream ran_f
ra_f.close();
}
}
Output
輸出量
ra_f.readUTF(): Welcome in Java World!!!
翻譯自: https://www.includehelp.com/java/randomaccessfile-seek-method-with-example.aspx
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