Introduction
The character array reader is the class used for reading of data in the form of character stream from the character array. The character buffer is used internally as an input stream for character arrays. But it doesn't use any type of resources like connection or file. The name of the class itself represents that have to read the character array as a stream.
Declaration
Java.io CharArrayReader class is declared as shown below:
Public class CharArrayReader extends Reader
Fields
Java.io CharArrayReader class fields are:
- Protected int markedPos :The field represents the presently position that have been marked in the stream.
- Protected int Count : The field represents to the index stream buffer ending.
- Protected Char [] buf : The field represents to the internal buffer called character buffer where actually the data stored.
- Protected int pos :The field represents to the position of input stream to read that coming character.
Table
| Constructor | Description |
|---|---|
| CharArrayReader (Char[] buf) | The function of this constructor is to create the character array reader and reads into the character buffer called array. |
| CharArrayReader (Char[] buf, int offset, int len) | The function of this constructor is to create the character array reader with represented size of buffer. |
Table
| Method | Description |
|---|---|
| void close () | The function of this method is to close the present stream and associated to this stream, systems resources are released without any impact. |
| Long skip (long m) | The function of this method is to skip the text or characters in this stream of ' m ' characters. |
| Boolean markSupported () | The function of this method is to check the represented mark method is supported by this stream or not |
| int read(Char[] c, int off, int n) | By using this method it reads the data up to 'n' bytes from the character stream into an array of characters. |
Description
From the following classes, methods are inherited to the character array reader class.
- Java.io.object
- Java.io.Reader
Examples
Usage of void close() method.
[c]import java.io.CharArrayReader;
import java.io.IOException;
public class CharArrayReader
{
public static void main(String[] args)
{
CharArrayReader car = null;
char[] ch = {'S', 'P', 'L', 'E', 'S', 'S', 'O', 'N', 'S'};
try{
// creating a new character array reader
car = new CharArrayReader(ch);
// FOr to close the character array stream
car.close();
// For To read the character array stream
car.read();
}catch(IOException e)
{
// if any I/O error occurs
System.out.print("Stream closed");
}finally
{
// releases all the system resources associated with this stream
if(car!=null)
car.close();
}
}
}[/c]
Output
Following is the result will be displayed.
[c]Stream closed[/c]
Usage of Long skip (long m) method.
[c]import java.io.CharArrayReader;
import java.io.IOException;
public class CharArrayRead
{
public static void main(String[] args)
{
CharArrayReader car = null;
char[] ch = {'S', 'P', 'L', 'E', 'S','S', 'O', 'N', 'S'};
try{
// creating a new character array reader
car = new CharArrayReader(ch);
int value = 0;
// TO read till the end of the stream
while((value=car.read())!=-1)
{
// For to convert integer to character
char c = (char)value;
// print the characters
System.out.print(c + "; ");
// For to skip single character.
long l = car.skip(1);
System.out.println("Characters Skipped : "+l);
}
}catch(IOException e)
{
// if any I/O error occurs
e.printStackTrace();
}finally
{
// releases all the system resources associated with this stream
if(car!=null)
car.close();
}
}
}[/c]
Output
Following is the result will be displayed.
[c]
L; Characters Skipped : 1
S; Characters Skipped : 1
O; Characters Skipped : 1
S; Characters Skipped : 0
[/c]
Key Points
- The Java.io CharArrayReader is the class used for reading of data in the form of character stream from the character array.
- The character buffer is used internally as an input stream for Java.io CharArrayReader.
- But it doesn't use any type of resources like connection or file.