Java InputStreamReader

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.

Constructor

Constructor name	Description
InputStreamReader(InputStream in)	It creates an InputStreamReader that uses the default charset.
InputStreamReader(InputStream in, Charset cs)	It creates an InputStreamReader that uses the given charset.
InputStreamReader(InputStream in, CharsetDecoder dec)	It creates an InputStreamReader that uses the given charset decoder.
InputStreamReader(InputStream in, String charsetName)	It creates an InputStreamReader that uses the named charset.

Method

Modifier and Type	Method	Description
void	close()	It closes the stream and releases any system resources associated with it.
String	getEncoding()	It returns the name of the character encoding being used by this stream.
int	read()	It reads a single character.
int	read(char[] cbuf, int offset, int length)	It reads characters into a portion of an array.
boolean	ready()	It tells whether this stream is ready to be read.

Example

public class InputStreamReaderExample {
	public static void main(String[] args) {
		try  {
			InputStream stream = new FileInputStream("file.txt");
			Reader reader = new InputStreamReader(stream);
			int data = reader.read();
			while (data != -1) {
				System.out.print((char) data);
				data = reader.read();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

Output:

I love my country

The file.txt contains text "I love my country" the InputStreamReader 
reads Character by character from the file

Next TopicJava PushbackInputStream Class

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