Java - Quiz - Quiz & Trivia

1. What is Java (in regard to Computer Science) ?

A type of coffee

AN OBJECT-ORIENTED PROGRAMMING LANGUAGE

2. WHAT IS AN APPLET?

A JAVA PROGRAM THAT IS RUN THROUGH A WEB BROWSER

A type of coffee

3. What is a function in terms of Computer Science ?

A group of code lines that performs a specific task

Something that contains an ‘init’

4. Java runs on _______.

Windows

All of the Above

Unix/Linux

5. If you want your conditional to depend on two conditions BOTH being true, what is the proper notation to put between the two Boolean statements ?

&&

!!

6. What is a loop ?

A new type of Applet

A segment of code to be run a specified amount of times

7. What does AWT stands for ?

Abstract window Toolkit

Adjust Window Toolkit

8. Booleans are _______.

True or False

Single characters

9. Following code will result in: int a = 3.5;

Compilation error

Runtime error

10. Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.

True

False

11. What is the main function of any variable ?

To add numbers together

To keep track of data in the memory of the computer

12. What is an assignment statement ?

Assigning a name to a variable

Assigning a value to a variable

13. An abstract class can have non-abstract methods

True

False

14. Primitive datatypes are allocated on a stack

True

False

15. Methods that are marked protected can be called in any subclass of that class.

True

False

16. What is the proper way to declare a variable ?

VariableName variableType;

VariableType variableName;

17. What's the difference between an Applet and an application ?

Applets can paint words, applications cannot.

Applets are run over the web.

18. Inner classes can be defined within methods

True

False

19. What is essential in making sure that your loop is not infinite ?

That there is a Boolean statement somewhere in your code

That your Boolean statement will at some point be false

20. The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code.

True

False

21. Following code will result in: float a = 9/0

Compilation error: DivideByZeroException

Runtime Exception

22. How can you prevent a member variable from becoming serialized?

By marking it volatile

By marking it transient

23. Which of the following means that in order for the conditional to happen, either x must be less than 3 or y must be greater than or equal to 4 ?

if ((x < 3) || (y > = 4))

if ((x > 3) || (y < = 4))

24. Following code will result in: int a = 9/0;

Compilation error: Divisions must be in a try block.

Runtime Exception

25. Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println("b is " + b); }}

Compilation error

Runtime Error

26. In a 'for' loop, what section of the loop is not included in the parentheses after "for" ?

Loop Body

Initialization

27. What is an instanceof

A methods in object

An operator and keyword

28. A class cannot be declared

Static

Private

29. If class A implements an interface does it need to implement all methods of that interface?

Yes, always

No, not when A is abstract

30. What is the size of a Char?

4 bits

7 bits

8 bits

16 bits

31. Can you compare a boolean to an integer?

Yes

No

32. Which is NOT a section of all types of loops ?

Test statement

The word "while"

33. Following code will result in: int a1 = 5; double a2 = (float)a1;

Runtime error

No errors

34. Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}

Runtime Exception

No errors

35. Why can't the whole program just consist of the one line that does the painting ?

In Java, to create an applet, you can't call on functions without defining a class to call them.

The drawString function is not defined without the "import" statements at the top.

All of the above.

36. Java keywords are written in lowercase as well as uppercase

True

False

37. A class can be transient

True

False

38. What will be the value of "num" after the following statements?

1

12

39. The following statements make "length" be what number ?

5

6

40. Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?

True

FALSE

41. Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}

Compile error

No error

42. The default statement of a switch is always executed

True

False