Multiple Choice

1. What is the entry point of a Java application ?

   • The start() method

   • The file HelloWorld.java

   • The main() method

   • The Java Virtual Machine

2. What is common use of a Hello World application ?

   • Proof of concept to show a device can run user code

   • To show that code is faster with a compiler

   • To check if your application contains bugs

   • Test if a programming language is object oriented

3. How do we call a line of code that performs a specific action and is terminated with a semicolon ?

   • A condition

   • An escape sequence

   • A method

   • A statement

4. Code in main() is placed between ...

   • slashes //

   • curly brackets {}

   • parentheses ()

   • brackets []

5. When we expect a positive integral value from the user and he/she inputs a negative number, than this may lead to a ...

   • Syntax error

   • Runtime error

   • Logic error

   • Grammatical error

6. When we want to add double quotes inside our string that is outputted to the terminal we need to make use of ...

    Hello, my name is "Nico De Witte"

   • \t

   • \x

   • \'

   • \"

7. What code statement can be used to output our name and age to the terminal as shown below ?

    Hello, my name is Nico and I am 32 years of age.

   • System.out.println("Hello, my name is Nico and I am " + 32 + " years of age.");

   • System.out.println('Hello, my name is Nico and I am ' + 32 + ' years of age.');

   • System.out.println("Hello, my name is Nico and I am " 32 " years of age.");

   • System.out.println("Hello, my name is Nico and I am " + 32 + ' years of age.')

8. The rectangle's (process step) in a flowchart will often map on ... in Java.

   • a condition

   • an escape sequence

   • a statement

   • a method

9. When we forget to place a curly brace than we create a ...

   • bug

   • runtime error

   • syntax error

   • system fault

10. How do we call \n, \t, \r ?

    • Insert characters

    • Terminators

    • Strings

    • Escape characters

11. How do we call a piece/line of code as shown below?

    System.out.println("Single line of code here");
    int number = 15;
    double size = number * 3.3;

    • Decisions

    • Statements

    • Conditions

    • Operators

12. What is not a use of creating a basic "Hello World" application?

    • It's an ideal introduction for beginning programmers

    • Useful to check if your development tools (IDE, compiler, ...) are configured/working as they should

    • Ideal to check if a programming language supports object oriented concepts

    • Used by hackers as a proof-of-concept to show that arbitrary code can be run on certain devices

13. When we forget to place a semicolon ; at the end of a statement, then we create a ...

    • bug

    • runtime error

    • syntax error

    • system error

14. What is the problem with the code below?

    public static void main(String[] args) {
        int sum;
        System.out.println("Sum = " + sum);
    }

    • It contains a variable that was not initialized

    • It contains a variable that was not declared

    • It contains a syntax error

    • It contains a variable with a wrong datatype

15. Suppose you write an application that needs to generate a list of numbers between 0 and 100 (both inclusive, so [0, 100]). However, the application generates values 100 exclusive, so [0, 100[. De app does run without crashing. What kind of error did you make?

    • A bug

    • A syntax error

    • A runtime error

    • If the app does not crash, it is ok

16. What is the problem with the code below?

    public static void main(String[] args) {
      int numberOfPeople = 15;
      System.out.println(There are + numberOfPeople + in the building);  
    }

    • A variable that was not declared

    • A syntax error

    • An uninitialized variable

    • An incorrect datatype for the variable

17. What is the result of the following statement?

    System.out.println("The total is " + 88 + 12 + " euro.");

    • The total is is 88 + 12 euro.

    • The total is is 8812 euro.

    • The total is is 100 euro.

    • The total is is euro.