Java ☕ User Input

The video tutorial introduces the concept of user input in programming, focusing on the Scanner class in Java. It explains how to use Scanner to take user input from the console, handle different data types, and create a simple calculator. The tutorial also discusses the historical context of user input and output in computing, highlighting the evolution from punch cards to modern methods. The video concludes with potential applications of the Scanner class in creating interactive programs.

What was one of the earliest methods used for input in computers?

• Punch cards

• Touchscreen

• Mouse clicks

• Voice commands

Which Java class is used to take user input from the keyboard?

• KeyboardInput

• Scanner

• InputReader

• ConsoleReader

What is the first step in using the Scanner class in a Java program?

• Write a print statement

• Import the Scanner class

• Compile the program

• Create a Scanner object

How do you store user input from the Scanner in a variable?

• Use the read() method

• Assign it directly to a variable

• Use the nextLine() method

• Use the input() method

What method is used to read an integer input using the Scanner class?

• readInt()

• nextInt()

• inputInt()

• getInt()

What happens if you input a string when the program expects an integer using nextInt()?

• The program will crash

• The program will ignore the input

• The program will convert it to an integer

• The program will read it as zero

In the simple calculator program, what data type is used to store numbers with decimals?

• long

• int

• float

• double

What is the purpose of concatenating strings in the output of the calculator program?

• To add numbers

• To store the result

• To create a personalized message

• To format the output

Which of the following is NOT a method of the Scanner class?

• nextInt()

• nextLine()

• nextDouble()

• nextChar()

What is a potential application of using the Scanner class in Java?

• Creating graphical user interfaces

• Developing text-based games

• Designing web pages

• Building mobile apps