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Questions and Answers
Which Java package contains the Scanner class?
Which Java package contains the Scanner class?
- java.io
- java.lang
- java.util (correct)
- java.net
What is the purpose of creating an object of the Scanner class?
What is the purpose of creating an object of the Scanner class?
- To import necessary libraries.
- To use the methods for taking user input. (correct)
- To specify the output format.
- To define the input type.
Which method of the Scanner class is used to read a floating-point number from the user?
Which method of the Scanner class is used to read a floating-point number from the user?
- nextDouble()
- nextFloat() (correct)
- getFloat()
- nextInteger()
What does the nextLine() method do in the Scanner class?
What does the nextLine() method do in the Scanner class?
If you need to read an integer value from the user using the Scanner class, which method should you use?
If you need to read an integer value from the user using the Scanner class, which method should you use?
What method is used to retrieve multiple types of user input?
What method is used to retrieve multiple types of user input?
What is the role of Scanner() constructor?
What is the role of Scanner() constructor?
Which of the following methods scans the next token of the input as a BigInteger?
Which of the following methods scans the next token of the input as a BigInteger?
Flashcards
Scanner class
Scanner class
A built-in Java class that provides various methods to read input from the user.
import java.util.Scanner;
import java.util.Scanner;
The method used to import the Scanner class in your Java program.
Scanner input = new Scanner(System.in);
Scanner input = new Scanner(System.in);
Creates an object of the Scanner class to access its methods.
int age = input.nextInt();
int age = input.nextInt();
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float price = input.nextFloat();
float price = input.nextFloat();
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String name = input.nextLine();
String name = input.nextLine();
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String token = input.next();
String token = input.next();
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String skippedInput = input.nextLine();
String skippedInput = input.nextLine();
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Study Notes
Using the Scanner Class in Java for User Input
- The
Scannerclass is used to take input from the user in Java. - It's a built-in class from the
java.utilpackage. - It offers various methods to handle different data types.
Importing and Creating a Scanner Object
- Import the
Scannerclass:import java.util.Scanner; - Create an object of the
Scannerclass:Scanner input = new Scanner(System.in);
Taking User Input of Different Types
- Integers:
int age = input.nextInt();(Waits for integer input and stores it inage) - Floats:
float price = input.nextFloat(); - Doubles:
double amount = input.nextDouble(); - Booleans:
boolean isValid = input.nextBoolean(); - Strings:
String name = input.next();(reads a single word)String line = input.nextLine();(reads an entire line from the input)
- Other Data Types: See the table below for more.
Table of Scanner Methods
| Method | Data Type | Description |
|---|---|---|
next() |
String | Reads the next complete token. |
nextBigDecimal() |
BigDecimal | Reads the next token as a BigDecimal. |
nextBigInteger() |
BigInteger | Reads the next token as a BigInteger. |
nextBoolean() |
boolean | Reads the next token as a boolean. |
nextByte() |
byte | Reads the next token as a byte. |
nextDouble() |
double | Reads the next token as a double. |
nextFloat() |
float | Reads the next token as a float. |
nextInt() |
int | Reads the next token as an integer. |
nextLine() |
String | Reads the entire line of input. |
nextLong() |
long | Reads the next token as a long. |
nextShort() |
short | Reads the next token as a short. |
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Description
This quiz covers the fundamental aspects of using the Scanner class in Java for user input. Topics include importing the class, creating a Scanner object, and methods for capturing various data types like integers, floats, and strings. Test your understanding of these concepts and how to apply them in Java programming.
