Question

What are the 4 main superclasses of the io package?

a) InputStream, OutputStream, Reader, Writer
b) Input, Output, Read, Write
c) SuperStream, SuperReader, SuperInput, SuperOutput
d) IOStream, IOWriter, IOReader, IOInput

Answer 1

The correct answer is a) InputStream, OutputStream, Reader, Writer. The io package provides classes for input and output in Java. There are four main superclasses: InputStream, OutputStream, Reader, and Writer.

Step-by-step explanation:

The correct answer is a) InputStream, OutputStream, Reader, Writer.

The io package provides classes for input and output in Java. There are four main superclasses in the io package:

1. InputStream: This abstract class is the superclass of all classes representing an input stream of bytes. It provides methods for reading bytes from a stream.
2. OutputStream: This abstract class is the superclass of all classes representing an output stream of bytes. It provides methods for writing bytes to a stream.
3. Reader: This abstract class is the superclass of all classes representing an input stream of characters. It provides methods for reading characters from a stream.
4. Writer: This abstract class is the superclass of all classes representing an output stream of characters. It provides methods for writing characters to a stream.

These superclasses are used for different types of input and output operations in Java. For example, you can use InputStream and OutputStream classes to read and write bytes, while Reader and Writer classes are used for reading and writing characters.