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 2 bytes.EOFException ：當文件指針在讀取2個字節之前到達EOF(文件末尾)時，可能引發此異常。

Syntax:

句法：

    public final char readChar();

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 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個字節的字符。

Example:

例：

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

Output

輸出量

ra_f.readChar(): I

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