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Questions and Answers
What class is used to get the user input?
In what package does the Scanner belong?
java.util
What is the use of the Scanner class?
To create an object of the class and use its available methods.
Match the methods of Scanner with their functionalities:
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What is the syntax to import the Scanner?
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What is the syntax to declare a Scanner?
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What is the syntax to read input from the user?
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What does 'scr' stand for?
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What is the safest way to read input as a string?
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What is the syntax to read INTEGER input from the user?
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Study Notes
Scanner Class Overview
- The Scanner Class is utilized for obtaining user input in Java programming.
- It is part of the
java.utilpackage, which contains utility classes for collections, date and time functions, etc.
Usage of Scanner Class
- To use Scanner, an object can be created using its constructors and methods for various input types.
- Important methods in Scanner include:
- nextLine(): Reads an entire line of text.
- nextInt(): Reads the next integer value.
- nextFloat(): Reads the next float value.
- nextDouble(): Reads the next double value.
Importing and Declaring Scanner
- Import the Scanner class with the syntax:
import java.util.Scanner; - Declare a Scanner object with the syntax:
Scanner scr = new Scanner(System.in);
Reading User Input
- To read a string input from the user, use:
stringname = scr.nextLine(); - For reading an integer input, the syntax is:
varname = scr.nextInt();
Additional Notes
- The variable
scrcommonly represents an instance of the Scanner class. - Using
nextLine()is the safest method for reading input as a string, ensuring the entire line is captured without errors.
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Description
Test your knowledge on the Scanner class in Java with this quiz. It covers the usage, methods, and package details essential for user input handling. Perfect for beginners looking to reinforce their understanding of Java.
