Java Scanner Class Quiz
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Questions and Answers

Which class can be used to read in user input?

  • BufferedReader
  • PrintWriter
  • Scanner (correct)
  • FileReader

What is the purpose of the Scanner class?

  • To manipulate strings
  • To read user input (correct)
  • To read data from a file
  • To write data to a file

Which of the following is NOT a method of the Scanner class?

  • readBoolean() (correct)
  • nextLine()
  • hasNext()
  • nextInt()

Which method can be used to read a character from the keyboard?

<p>System.in.readChar() (D)</p> Signup and view all the answers

What does the System.in.readLine() method do?

<p>Prints output to the console (A)</p> Signup and view all the answers

Which class provides the System.in.readLine() method?

<p>InputStreamReader (B)</p> Signup and view all the answers

Flashcards

What is the Scanner class?

A class used to obtain input from the user.

Purpose of Scanner class?

To read various types of input (int, String, etc.) from sources like the keyboard.

readBoolean()?

There is no readBoolean() method directly in the standard Scanner class.

Read a character?

There is no method to directly read a character from the keyboard. Use System.in.read() and cast.

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What does System.in.readLine() do?

Prints output to the console (this definition is incorrect, this method it prints, not read).

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Class for System.in.readLine()?

InputStreamReader provides this (incorrect, System.in.readLine does not exist).

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Study Notes

Input and Output in Java

  • The Scanner class can be used to read in user input.

Purpose of Scanner Class

  • The purpose of the Scanner class is to read input from various sources, such as the keyboard or a file.

Methods of the Scanner Class

  • nextInt(), nextDouble(), next(), and nextLine() are methods of the Scanner class.
  • hasNextInt(), hasNextDouble(), hasNext(), and hasNextLine() are also methods of the Scanner class.

Reading a Character from the Keyboard

  • The next() method can be used to read a string from the keyboard, but not a single character.
  • There is no method in the Scanner class to read a single character from the keyboard.

System.in.readLine() Method

  • There is no System.in.readLine() method in Java.
  • The System.in object is an InputStream, which does not have a readLine() method.

BufferedReader Class

  • The BufferedReader class provides a readLine() method, which can be used to read a line of text from the keyboard or a file.

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Description

Test your knowledge on reading user input in Java with this quiz! Learn about the purpose of the Scanner class and identify its methods. Find out which method is NOT a part of the Scanner class.

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