Java IO Basics

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Question 1

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

  • InputStreamReader

  • Reader

  • InputStream

  • BufferedReader

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Question 2

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

  • '0'

  • 0

  • -1

  • null

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Question 3

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 4

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

  • FileReader

  • FileOutputStream

  • FileWriter

  • ObjectWriter

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Question 5

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 6

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

  • stop()

  • flush()

  • shutdown()

  • close()

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Question 7

What is the purpose of the Java I/O (Input/Output) system?

  • To handle network communication

  • To handle file and console input and output

  • To manage database connections

  • To manage memory and CPU usage

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Question 8

Which of the following I/O streams does not require closing after use?

  • Reader and Writer

  • FileInputStream and FileOutputStream

  • BufferedReader and BufferedWriter

  • None of the above

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Question 9

What does the close() method do in the context of Java I/O streams?

  • Releases any system resources used by the stream

  • Reads data from the stream

  • Writes data to the stream

  • None of the above

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