Java
Quiz
There are 23 questions in this quiz. Good luck!
Passing grade is 70% = C.
Passing grade is 70% = C.
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1) What is the size of a Char?
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a)
 4 bits |
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b)
7 bits |
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c)
8 bits |
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d)
16 bits |
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2) A class cannot be declared:
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a)
Static |
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b)
Private |
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c)
Default |
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3) Following code will result in: int a =
3.5;
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a)
Compilation error |
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b)
Runtime error |
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c)
a being 3.5 |
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d)
a being 3. |
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4) Following code will result in: int a1 =
5; double a2 = (float)a1;
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a)
Compilation error |
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b)
Runtime error |
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c)
No errors |
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5) Following code will result in: int a =
9/0;
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a)
Compilation error: Divisions
must be in a try block. |
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b)
Compilation error:
DivideByZeroException |
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c)
Runtime Exception |
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d)
No Error: a is NaN |
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6) Following code will result in: float a =
9/0;
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a)
Compilation error: Divisions
must be in a try block |
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b)
Compilation error:
DivideByZeroException |
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c)
Runtime Exception |
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d)
No Error: a is NaN |
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7) A class can be transient
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a)
True |
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b)
False |
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8) Following code will result in: class A {
int b = 1; public static void main(String [] args) {
System.out.println("b is " + b); }}
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a)
Compilation error |
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b)
Runtime Error |
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c)
Runtime Exception |
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d)
Output of b is 1 |
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9) Following code will result in: class A {
public static void main(String [] args) {B b = new A(); }} class B extends A
{}
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a)
Compile error |
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b)
Runtime Exception |
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c)
No error |
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10) Following code will result in: class A {
public static void main(String [] args) {A a = new B(); }} class B extends A
{}
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a)
Compiler error |
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b)
Runtime Exception |
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c)
No errors |
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11) Methods that are marked protected can be
called in any subclass of that class.
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a)
True |
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b)
False |
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12) An abstract class can have non-abstract
methods.
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a)
True |
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b)
False |
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13) Java keywords are written in lowercase
as well as uppercase.
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a)
True |
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b)
False |
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14) What is an instanceof
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a)
A methods in object |
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b)
An operator and keyword |
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15) Primitive datatypes are allocated on a
stack.
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a)
True |
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b)
False |
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16) Can you compare a boolean to an integer?
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a)
Yes |
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b)
No |
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17) If class A implements an interface does
it need to implement all methods of that interface?
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a)
Yes, always. |
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b)
No, not when A is abstract |
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18) Integer a = new Integer(2); Integer b =
new Integer(2); What happens when you do if (a==b)?
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a)
Compiler error |
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b)
Runtime Exception |
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c)
True |
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d)
False |
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19) The methods wait(), notify() and
notifyAll() in Object need to be called from synchronized pieces of code.
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a)
True |
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b)
False |
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20) Inner classes can be defined within
methods.
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a)
True |
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b)
False |
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21) Synchronized is a keyword to tell a
Thread to grab an Object lock before continuing execution.
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a)
True |
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b)
False |
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22) The default statement of a switch is
always executed.
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a)
True |
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b)
False |
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23) How can you prevent a member variable
from becoming serialized?
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a)
By marking it private |
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b)
By marking it volatile |
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c)
By marking it transient |
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d)
You can not. |
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