Java - Quiz
Test your Java Skills.
- 1.
What is the size of a Char?
- A.
4 bits
- B.
7 bits
- C.
8 bits
- D.
16 bits
Correct Answer
D. 16 bits -
- 2.
A class cannot be declared
- A.
Static
- B.
Private
Correct Answer
B. Private -
- 3.
Following code will result in: int a = 3.5;
- A.
Compilation error
- B.
Runtime error
Correct Answer
A. Compilation error -
- 4.
Following code will result in: int a1 = 5; double a2 = (float)a1;
- A.
Runtime error
- B.
No errors
Correct Answer
B. No errors -
- 5.
Following code will result in: int a = 9/0;
- A.
Compilation error: Divisions must be in a try block.
- B.
Runtime Exception
Correct Answer
B. Runtime Exception -
- 6.
Following code will result in: float a = 9/0
- A.
Compilation error: DivideByZeroException
- B.
Runtime Exception
Correct Answer
B. Runtime Exception -
- 7.
A class can be transient
- A.
True
- B.
False
Correct Answer
B. False -
- 8.
Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println("b is " + b); }}
- A.
Compilation error
- B.
Runtime Error
Correct Answer
A. Compilation error -
- 9.
Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}
- A.
Compile error
- B.
No error
Correct Answer
A. Compile error -
- 10.
Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}
- A.
Runtime Exception
- B.
No errors
Correct Answer
B. No errors -
- 11.
Methods that are marked protected can be called in any subclass of that class.
- A.
True
- B.
False
Correct Answer
A. True -
- 12.
An abstract class can have non-abstract methods
- A.
True
- B.
False
Correct Answer
A. True -
- 13.
Java keywords are written in lowercase as well as uppercase
- A.
True
- B.
False
Correct Answer
A. True -
- 14.
What is an instanceof
- A.
A methods in object
- B.
An operator and keyword
Correct Answer
B. An operator and keyword -
- 15.
Primitive datatypes are allocated on a stack
- A.
True
- B.
False
Correct Answer
A. True -
- 16.
Can you compare a boolean to an integer?
- A.
Yes
- B.
No
Correct Answer
B. No -
- 17.
If class A implements an interface does it need to implement all methods of that interface?
- A.
Yes, always
- B.
No, not when A is abstract
Correct Answer
B. No, not when A is abstract -
- 18.
Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?
- A.
True
- B.
FALSE
Correct Answer
B. FALSE -
- 19.
The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code.
- A.
True
- B.
False
Correct Answer
A. True -
- 20.
Inner classes can be defined within methods
- A.
True
- B.
False
Correct Answer
A. True -
- 21.
Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.
- A.
True
- B.
False
Correct Answer
A. True -
- 22.
The default statement of a switch is always executed
- A.
True
- B.
False
Correct Answer
B. False -
- 23.
How can you prevent a member variable from becoming serialized?
- A.
By marking it volatile
- B.
By marking it transient
Correct Answer
B. By marking it transient -
- 24.
What is Java (in regard to Computer Science) ?
- A.
A type of coffee
- B.
AN OBJECT-ORIENTED PROGRAMMING LANGUAGE
Correct Answer
B. AN OBJECT-ORIENTED PROGRAMMING LANGUAGE -
- 25.
WHAT IS AN APPLET?
- A.
A JAVA PROGRAM THAT IS RUN THROUGH A WEB BROWSER
- B.
A type of coffee
Correct Answer
A. A JAVA PROGRAM THAT IS RUN THROUGH A WEB BROWSER -
- 26.
Java runs on _______.
- A.
Windows
- B.
All of the Above
- C.
Unix/Linux
Correct Answer
B. All of the Above -
- 27.
Why can't the whole program just consist of the one line that does the painting ?
- A.
In Java, to create an applet, you can't call on functions without defining a class to call them.
- B.
The drawString function is not defined without the "import" statements at the top.
- C.
All of the above.
Correct Answer
C. All of the above. -
- 28.
What's the difference between an Applet and an application ?
- A.
Applets can paint words, applications cannot.
- B.
Applets are run over the web.
Correct Answer
B. Applets are run over the web. -
- 29.
What is the main function of any variable ?
- A.
To add numbers together
- B.
To keep track of data in the memory of the computer
Correct Answer
B. To keep track of data in the memory of the computer -
- 30.
What is the proper way to declare a variable ?
- A.
VariableName variableType;
- B.
VariableType variableName;
Correct Answer
B. VariableType variableName; -
- 31.
Booleans are _______.
- A.
True or False
- B.
Single characters
Correct Answer
A. True or False -
- 32.
The following statements make “length” be what number ?
- A.
5
- B.
6
Correct Answer
A. 5 -
- 33.
What is an assignment statement ?
- A.
Assigning a name to a variable
- B.
Assigning a value to a variable
Correct Answer
B. Assigning a value to a variable -
- 34.
What will be the value of “num” after the following statements?
- A.
1
- B.
12
Correct Answer
B. 12 -
- 35.
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 ?
- A.
&&
- B.
!!
Correct Answer
A. && -
- 36.
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 ?
- A.
if ((x < 3) || (y > = 4))
- B.
if ((x > 3) || (y < = 4))
Correct Answer
A. if ((x < 3) || (y > = 4)) -
- 37.
What is a loop ?
- A.
A new type of Applet
- B.
A segment of code to be run a specified amount of times
Correct Answer
B. A segment of code to be run a specified amount of times -
- 38.
What is essential in making sure that your loop is not infinite ?
- A.
That there is a Boolean statement somewhere in your code
- B.
That your Boolean statement will at some point be false
Correct Answer
B. That your Boolean statement will at some point be false -
- 39.
Which is NOT a section of all types of loops ?
- A.
Test statement
- B.
The word "while"
Correct Answer
B. The word "while" -
- 40.
In a ‘for’ loop, what section of the loop is not included in the parentheses after “for” ?
- A.
Loop Body
- B.
Initialization
Correct Answer
A. Loop Body -
- 41.
What is a function in terms of Computer Science ?
- A.
A group of code lines that performs a specific task
- B.
Something that contains an ‘init’
Correct Answer
A. A group of code lines that performs a specific task -
- 42.
What does AWT stands for ?
- A.
Abstract window Toolkit
- B.
Adjust Window Toolkit
Correct Answer
A. Abstract window Toolkit -
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
-
Feb 14, 2014Quiz Edited by
ProProfs Editorial Team -
Nov 24, 2013Quiz Created by
Dbhacker9988
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