Java IO Basics

Here are 10 essential multiple-choice questions on Java IO Basics, covering key concepts.

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Question 1

Which package contains the core classes for Java IO?

  • java.input

  • java.io

  • java.util.io

  • java.file

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Question 2

Which of the following is a superclass of all byte input streams?

  • InputStreamReader

  • Reader

  • InputStream

  • BufferedReader

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Question 3

What does the read() method of FileInputStream return when the end of file is reached?

  • '0'

  • 0

  • -1

  • null

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Question 4

Which stream would you use to read character data from a file?

  • FileInputStream

  • FileReader

  • BufferedWriter

  • ObjectInputStream

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Question 5

What is the primary difference between Reader and InputStream?

  • Reader is abstract, InputStream is not

  • Reader handles characters, InputStream handles bytes

  • InputStream handles characters, Reader handles lines

  • No difference

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Question 6

Which class is used to write character data to a file?

  • FileReader

  • FileOutputStream

  • FileWriter

  • ObjectWriter

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Question 7

What is the output of this snippet?

Java 
File f = new File("log.txt");
System.out.println(f.exists());


  • true if file exists

  • Always true

  • Always false

  • Compilation error

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Question 8

Which method is used to close an IO stream in Java?

  • stop()

  • flush()

  • shutdown()

  • close()

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Question 9

What happens if FileInputStream is given a non-existent file?

  • Returns null

  • Creates a new file

  • Throws FileNotFoundException

  • Ignores the error

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Question 10

Which is the correct hierarchy?

  • FileReader → Reader → Writer

  • FileInputStream → InputStream → OutputStream

  • FileWriter → Writer → OutputStream

  • FileReader → InputStream → Reader

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