outputstreamREADER

The InputStreamReader class is a class in the Java API that is used to adapt an InputStream object to a Reader object. This class reads characters from an InputStream object and converts them into Unicode characters.

The constructors of the InputStreamReader class take as input an InputStream object and an optional character encoding type. The default character encoding type is based on the platform's default encoding, but can be specified by passing in an encoding type as a string to the constructor.

An InputStreamReader object can be used wherever a Reader object is needed, such as when reading text data from a file or network connection. The InputStreamReader class provides a convenient way to read text data from sources that return bytes of data, such as network sockets or input streams.

Example code:

InputStream inputStream = new FileInputStream("myFile.txt");
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String line;
while ((line = bufferedReader.readLine()) != null) {
    System.out.println(line);
}

bufferedReader.close();

In this example, an InputStream object is created from a file named "myFile.txt". An InputStreamReader object is then created by passing in the input stream object and specifying the character encoding type as UTF-8. Finally, a BufferedReader object is created from the InputStreamReader object, and used to read each line of text from the input file.