RandomAccessFile類readUTF()方法 (RandomAccessFile Class readUTF() method)

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

  readUTF()方法在java.io包中可用。

• readUTF() method is used to read this RandomAccessFile as a string.

  readUTF()方法用于以字符串形式讀取此RandomAccessFile。

• readUTF() 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.

  readUTF()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。

• readUTF() method may throw an exception at the time of reading the file as a string.

  readUTF()方法在將文件讀取為字符串時可能會引發異常。

  • 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。
  • EOFException: This exception may throw when the file pointer reaches EOF (End-Of-File) before reading all bytes.EOFException ：當文件指針在讀取所有字節之前到達EOF(文件末尾)時，可能引發此異常。
  • UTFDataFormatException: This exception may throw when the bytes denote invalid UTF-8 encoding schemes.UTFDataFormatException ：當字節表示無效的UTF-8編碼方案時，可能引發此異常。

Syntax:

句法：

    public final String readUTF();

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 String, it gets Unicode string value.

此方法的返回類型為String ，它獲取Unicode字符串值。

Example:

例：

// Java program to demonstrate the example 
// of String readUTF() method of
// RandomAccessFile
import java.io.*;
class RAFReadUTF {
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!!!");
// Initially set the file pointer
// is at 1 for reading the file
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-readutf-method-with-example.aspx