Java Development And Programming Quiz Questions
This test will measure the applicants knowledge and competency in the technical field of Java development and programming
- 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
- C.
Default
Correct Answer
B. Private -
- 3.
Following code will result in: int a = 3.5;
- A.
Compilation error
- B.
Runtime error
- C.
A being 3.5
- D.
A being 3
Correct Answer
A. Compilation error -
- 4.
Following code will result in: int a1 = 5; double a2 = (float)a1;
- A.
Compilation error
- B.
Runtime error
- C.
No errors
Correct Answer
C. No errors -
- 5.
Following code will result in: int a = 9/0;
- A.
Compilation error: Divisions must be in a try block
- B.
Compilation error: DivideByZeroException
- C.
Runtime Exception
- D.
No Error: a is NaN
Correct Answer
C. Runtime Exception -
- 6.
Following code will result in: float a = 9/0;
- A.
Compilation error: Divisions must be in a try block
- B.
Compilation error: DivideByZeroException
- C.
Runtime Exception
- D.
No Error: a is NaN
Correct Answer
D. No Error: a is NaN -
- 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
- C.
Runtime Exception
- D.
Output of b is 1
Correct Answer
A. Compilation error -
- 9.
Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}
- A.
Compile error
- B.
Runtime Exception
- C.
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.
Compiler error
- B.
Runtime Exception
- C.
No errors
Correct Answer
C. 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
B. False -
- 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.
Compiler error
- B.
Runtime Exception
- C.
True
- D.
False
Correct Answer
D. 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
B. False -
- 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.
By marking it private
- B.
By marking it volatile
- C.
By marking it transient
- D.
You can not.
Correct Answer
C. By marking it transient -
- 23.
Which one does not extend java.lang.Number
- A.
Integer
- B.
Boolean
- C.
Character
- D.
Long
- E.
Short
Correct Answer(s)
B. Boolean
C. Character -
- 24.
What is default layout manager for panels and applets?
- A.
Flowlayout
- B.
Gridlayout
- C.
BorderLayout
Correct Answer
A. Flowlayout -
- 25.
Which of the following statements are true?
- A.
When you construct an instance of File, if you do not use the filenaming semantics of the local machine, the constructor will throw an IOException.
- B.
When you construct an instance of File, if the corresponding file does not exist on the local file system, one will be created.
- C.
When an instance of File is garbage collected, the corresponding file on the local file system is deleted.
- D.
None of the above
Correct Answer(s)
A. When you construct an instance of File, if you do not use the filenaming semantics of the local machine, the constructor will throw an IOException.
B. When you construct an instance of File, if the corresponding file does not exist on the local file system, one will be created.
C. When an instance of File is garbage collected, the corresponding file on the local file system is deleted. -
- 26.
You execute the code below in an empty directory. What is the result? File f1 = new File("dirname"); File f2 = new File(f1, "filename");
- A.
A new directory called dirname is created in the current working directory
- B.
A new directory called dirname is created in the current working directory. A new file called filename is created in directory dirname
- C.
A new directory called dirname and a new file called filename are created, both in the current working directory
- D.
A new file called filename is created in the current working directory
- E.
No directory is created, and no file is created
Correct Answer
E. No directory is created, and no file is created -
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Current Version
-
Mar 21, 2022Quiz Edited by
ProProfs Editorial Team -
Jul 03, 2012Quiz Created by
Pioneersuri
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