RandomAccessFile类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()方法用于从此文件读取字符值，它可以从文件读取最多2个字节的字符。

• 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()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  readChar()方法在读取char时可能会引发异常。

  • IOException: This exception may throw an exception while performing input/output operation.IOException ：在执行输入/输出操作时，此异常可能会引发异常。
  • EOFException: This exception may throw when the file pointer reaches EOF (End-Of-File) before reading 2 bytes.EOFException ：当文件指针在读取2个字节之前到达EOF(文件末尾)时，可能引发此异常。

Syntax:

句法：

public final char readChar();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is char, it returns the character of next 2 bytes from this file.

该方法的返回类型为char ，它从该文件返回下一个2个字节的字符。

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 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

输出量

ra_f.readChar(): I

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