Questions and Answers
By default, the values read by Scanner input methods are delimited by spaces, tabs, and newline characters.
True
The next and nextLine methods both read and return character strings.
True
The Scanner class does not have a method to read a single character.
True
The nextLine method of the Scanner class consumes the newline character at the end of the line.
Signup and view all the answers
What package is the Scanner class a part of?
Signup and view all the answers
What is passed to the constructor when a new Scanner object is created?
Signup and view all the answers
What is the text used to request information from a user called?
Signup and view all the answers
What object represents the standard input stream, which is input typed by the user at the keyboard?
Signup and view all the answers
What happens if an input value does not match the type expected by the Scanner method used to read it?
Signup and view all the answers
Study Notes
Scanner Class Overview
- By default, Scanner reads input values delimited by spaces, tabs, and newline characters, collectively known as white space.
- The
nextandnextLinemethods return character strings, but differ in the quantity of text they read:nextreads a single word, whilenextLinereads the entire line until a newline character is encountered.
Input Handling
- The Scanner class does not provide a method to read individual characters directly; to achieve this, a string must be read first and processed one character at a time.
- The
nextLinemethod consumes the newline character at the end of the line, but the character itself is not included in the returned string.
Scanner Class Details
- The Scanner class is part of the
java.utilpackage, which must be imported for use. - When creating a new Scanner object, the constructor takes the source of input as an argument, which can be anything from user input to file data.
User Interaction
- The text used to prompt the user for information is called a prompt, guiding the user on what input is expected.
- The standard input stream representing keyboard input is
System.in, allowing Scanner to read data entered by the user.
Error Handling
- If an input value does not match the expected type for the method used (e.g., reading a string as an integer), an exception will be thrown, indicating a mismatch or error in input handling.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of the Java Scanner class with these flashcards! The questions cover key concepts such as input methods and string reading capabilities. Perfect for Java learners looking to reinforce their understanding.
