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(tài)方法，只能通過類對(duì)象訪問，如果嘗試使用類名稱訪問該方法，則會(huì)收到錯(cuò)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(shí)可能會(huì)引發(fā)異常。

  • IOException: This exception may throw an exception while performing input/output operation.IOException ：在執(zhí)行輸入/輸出操作時(shí)，此異常可能會(huì)引發(fā)異常。
  • EOFException: This exception may throw when the file pointer reaches EOF (End-Of-File) before reading all bytes.EOFException ：當(dāng)文件指針在讀取所有字節(jié)之前到達(dá)EOF(文件末尾)時(shí)，可能引發(fā)此異常。
  • UTFDataFormatException: This exception may throw when the bytes denote invalid UTF-8 encoding schemes.UTFDataFormatException ：當(dāng)字節(jié)表示無(wú)效的UTF-8編碼方案時(shí)，可能引發(fā)此異常。

Syntax:

句法：

public final String readUTF();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

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 // RandomAccessFileimport java.io.*;class RAFReadUTF {public static void main(String[] args) throws Exception {// Instantiate a random access file// object with file name and permissionsRandomAccessFile ra_f = new RandomAccessFile("e:/includehelp.txt", "rw");// By using writeUTF() method is to // write data to the filera_f.writeUTF("Welcome in Java World!!!");// Initially set the file pointer// is at 1 for reading the filera_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_fra_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

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