ObjectInputStream类readChar()方法 (ObjectInputStream 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 2 byte (i.e. 16 bit) of character from this ObjectInputStream.

  readChar()方法用于从此ObjectInputStream读取2个字节(即16位)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 character.

  readChar()方法在读取字符时可能会引发异常。

  • IOException: This exception may throw when getting any input/output error while performing.IOException ：在执行过程中遇到任何输入/输出错误时，可能引发此异常。
  • EOFException: This exception may throw when the end of the file is reached.EOFException ：到达文件末尾时，可能会引发此异常。

Syntax:

句法：

    public 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 the method is char, it returns the two bytes character value read.

该方法的返回类型为char ，它返回读取的两个字节的字符值。

Example:

例：

// Java program to demonstrate the example 
// of char readChar() method of 
// ObjectInputStream
import java.io.*;
public class ReadCharOfOIS {
public static void main(String[] args) throws Exception {
// Instantiates ObjectOutputStream , ObjectInputStream 
// FileInputStream and FileOutputStream
FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");
ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);
FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");
ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);
// By using writeChar() method is to write
// char to the obj_out_stm stream
obj_out_stm.writeChar('J');
obj_out_stm.writeChar('A');
obj_out_stm.writeChar('V');
obj_out_stm.writeChar('A');
obj_out_stm.flush();
while (obj_in_stm.available() > 0) {
// By using readChar() method is to read
// string characters one by one as a char
char val = (char) obj_in_stm.readChar();
System.out.println("obj_in_stm.readChar(): " + val);
}
// By using close() method is to 
// close all the streams 
file_in_stm.close();
file_out_stm.close();
obj_in_stm.close();
obj_out_stm.close();
}
}

Output

输出量

obj_in_stm.readChar(): J
obj_in_stm.readChar(): A
obj_in_stm.readChar(): V
obj_in_stm.readChar(): A

翻译自: https://www.includehelp.com/java/objectinputstream-readdouble-method-with-example.aspx