Podcast
Questions and Answers
Which class can be used to read in user input?
Which class can be used to read in user input?
- BufferedReader
- PrintWriter
- Scanner (correct)
- FileReader
What is the purpose of the Scanner class?
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?
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?
Which method can be used to read a character from the keyboard?
What does the System.in.readLine() method do?
What does the System.in.readLine() method do?
Which class provides the System.in.readLine() method?
Which class provides the System.in.readLine() method?
Flashcards
What is the Scanner class?
What is the Scanner class?
A class used to obtain input from the user.
Purpose of Scanner class?
Purpose of Scanner class?
To read various types of input (int, String, etc.) from sources like the keyboard.
readBoolean()?
readBoolean()?
There is no readBoolean() method directly in the standard Scanner class.
Read a character?
Read a character?
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What does System.in.readLine() do?
What does System.in.readLine() do?
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Class for System.in.readLine()?
Class for System.in.readLine()?
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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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