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Questions and Answers
What is the purpose of the Scanner class in Java?
What is the purpose of the Scanner class in Java?
- To print results on the screen
- To perform mathematical operations in the program
- To allow the user to enter their own values at runtime (correct)
- To hold hardcoded values in the program
Which version of Java introduced the Scanner class?
Which version of Java introduced the Scanner class?
- Java 5 (correct)
- Java 8
- Java 7
- Java 3
What does 'import java.util.*;' do?
What does 'import java.util.*;' do?
- Imports all classes from the main package
- Imports all classes from the java package
- Imports all classes from the util package (correct)
- Imports all classes from the Scanner package
Why do we need to import java.util.Scanner;?
Why do we need to import java.util.Scanner;?
What is the problem with the initial Add2Numbers program?
What is the problem with the initial Add2Numbers program?
What does the asterisk * signify in 'import java.util.*;'?
What does the asterisk * signify in 'import java.util.*;'?
What should be passed to the Scanner constructor to read input from the keyboard?
What should be passed to the Scanner constructor to read input from the keyboard?
Which method is used to read in an integer using the Scanner class?
Which method is used to read in an integer using the Scanner class?
What method is used to read a line up until it reaches a white space using the Scanner class?
What method is used to read a line up until it reaches a white space using the Scanner class?
Which method is used to read a line (up until it reaches return) using the Scanner class?
Which method is used to read a line (up until it reaches return) using the Scanner class?
How can a value be assigned to a String object in Java?
How can a value be assigned to a String object in Java?
Which method is used to get the first character of a String input using the Scanner class?
Which method is used to get the first character of a String input using the Scanner class?
What does System.out represent in Java?
What does System.out represent in Java?
What does the following code do: firstName = new String();?
What does the following code do: firstName = new String();?
What type of input does the Scanner class method 'nextDouble()' read?
What type of input does the Scanner class method 'nextDouble()' read?
What does the following line of code do: num1 = keyboardIn.nextInt();?
What does the following line of code do: num1 = keyboardIn.nextInt();?
What is the purpose of 'import java.util.*;'?
What is the purpose of 'import java.util.*;'?
What will be printed by the following code: System.out.println(num1 + ' and ' + num2);?
What will be printed by the following code: System.out.println(num1 + ' and ' + num2);?
Study Notes
Java Basics
- The Scanner class in Java is used to get input from the user.
Importing Classes
import java.util.*;is used to import all classes from the java.util package, including the Scanner class.- The asterisk * in
import java.util.*;is a wildcard that represents all classes in the package. import java.util.Scanner;is used to import only the Scanner class.
Scanner Class
- The Scanner class was introduced in Java 1.5.
- To read input from the keyboard,
new Scanner(System.in)should be passed to the Scanner constructor. - The
nextInt()method is used to read an integer using the Scanner class. - The
next()method is used to read a line up until it reaches a white space using the Scanner class. - The
nextLine()method is used to read a line up until it reaches return using the Scanner class.
String Objects
- A value can be assigned to a String object in Java using the
newkeyword, for example:firstName = new String();.
Input and Output
System.outrepresents the standard output stream in Java, used to print messages to the console.- The
nextDouble()method is used to read a double value using the Scanner class. - The
num1 = keyboardIn.nextInt();line of code reads an integer from the keyboard and assigns it tonum1. - The
System.out.println(num1 + ' and ' + num2);line of code prints the values ofnum1andnum2to the console.
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Description
Learn about the Scanner class in Java, which allows user input for a program to act on specific values. Explore how to use the Scanner class to add two numbers in a Java program.
