InputStreamReader read() in Java

read(): This method is available in the java.io.InputStreamReader class of Java.

Syntax:

int java.io.InputStreamReader.read() throws IOException

This method reads a single character.

Parameters: NA

Returns: The character read, or -1 if the end of the stream has been reached.

Throws:

IOException - If an I/O error occurs

Approach 1: When no exception

Java

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class InputStreamReaderread {
    public static void main(String[] args) throws IOException {

        File file = new File("D:\\hello.txt");
        InputStream in = new FileInputStream(file);
        InputStreamReader inputStreamReader = 
                             new InputStreamReader(in);

        try {
            System.out.println(inputStreamReader.read());
        } catch (IOException e) {
            System.out.println("IOException occurs");
        }

        inputStreamReader.close();
    }
}

Output:

-1

Approach 2: IOException 

Java

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class InputStreamReaderread {
    public static void main(String[] args) throws IOException {

        File file = new File("D:\\hello.txt");
        InputStream in = new FileInputStream(file);
        InputStreamReader inputStreamReader = 
                              new InputStreamReader(in);

        inputStreamReader.close();
        try {
            System.out.println(inputStreamReader.read());
        } catch (IOException e) {
            System.out.println("IOException occurs");
        }

    }
}

Output:

IOException occurs

Some more methods of InputStreamReader

close(): This method closes the stream and releases any system resources associated with it.

InputStreamReader(InputStream): This method creates an InputStreamReader that uses the default charset.

InputStreamReader(InputStream, Charset): This method creates an InputStreamReader that uses the given charset.

InputStreamReader(InputStream, CharsetDecoder): This method creates an InputStreamReader that uses the given charset decoder.

InputStreamReader(InputStream, String): This method creates an InputStreamReader that uses the named charset.

getEncoding(): This method returns the name of the character encoding being used by this stream.

read(char[], int, int): This method reads characters into a portion of an array.

ready(): This method tells whether this stream is ready to be read.