RandomAccessFile類readChar()方法 (RandomAccessFile Class readChar() method)

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

  readChar()方法在java.io包中可用。

• readChar() method is used to read a character value from this file and it can read character up to 2 bytes from the file.

  readChar()方法用于從此文件讀取字符值，它可以從文件讀取最多2個字節(jié)的字符。

• readChar() 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.

  readChar()方法是一種非靜態(tài)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。

• readChar() method may throw an exception at the time of reading char.

  readChar()方法在讀取char時可能會引發(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，此異常可能會引發(fā)異常。
  • EOFException: This exception may throw when the file pointer reaches EOF (End-Of-File) before reading 2 bytes.EOFException ：當文件指針在讀取2個字節(jié)之前到達EOF(文件末尾)時，可能引發(fā)此異常。

Syntax:

句法：

public final char readChar();

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 char, it returns the character of next 2 bytes from this file.

該方法的返回類型為char ，它從該文件返回下一個2個字節(jié)的字符。

Example:

例：

// Java program to demonstrate the example // of char readChar() method of // RandomAccessFileimport java.io.*;class RAFReadChar {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 writeChar() method is to // write character to the filera_f.writeChar('I');// Initially set the file pointer// is at 0 for reading the filera_f.seek(0);// By using readChar() method is to // read character from the filechar ch = ra_f.readChar();System.out.println("ra_f.readChar(): " + ch);// By using close() method isto// close this stream ran_fra_f.close();} }

Output

輸出量

ra_f.readChar(): I

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

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