Java MCQ Test – 1
Que.1. Which of the following statements
is false about objects?
A. An
instance of a class is an object
B. Object
can access both static and instance data.
C. Object
is the super class of all other classes
D. Object
do not permit encapsulation
Right Answer: D
Que.2. All the wrapper class (Integer,
Boolean, Float, Short, Long, Double and Character) in java
A. are
private
B. are
serializable
C. are
immutable
D. are
finale
Right Answer: D
Que.3. The code snippet if
(“Welcome”.trim() == ”Welcome”.trim()) System.out.println(“Equals”); else
System.out.println(“Not Equal”); will ____________
A. compile
and display Equal
B. compile
and display Not Equal
C. cause
a compiler error
D. compile
and display NULL
Right Answer: C
Que.4. What is an aggregate?
A. An
object with only primitive attributes.
B. An
instance of a class which has only static methods.
C. An
instance which has other objects.
D. None
of the above.
Right Answer: C
Que.5. A class can have many methods
with the same name as long as the number of parameters or type of parameters is
different. This OOP concept is known as ________.
A. Method
Invocating.
B. Method
Overriding.
C. Method
Labeling.
D. Method
Overloading.
Right Answer: D
Que.6. When a thread terminates its
processing, into what state the thread enters?
A. Running
State.
B. Waiting
State.
C. Dead
State.
D. Beginning
State.
Right Answer: C
Que.7. Which methods can access to
private attributes of a class?
A. Only
static methods of the same class.
B. Only
instance of the same class.
C. Only
methods those defined in the same class.
D. Only
classes available in the same package.
Right Answer: C
Que.8. Which of the
following is considered as a blue print that defines the variables and methods
common to all of its objects of a specific kind?
A. Object
B. Class
C. Method
D. Real
data types
Right
Answer: B
Que.9. Which of
the following statement is true?
A. A
subclass is a sub set of a superclass.
B. Class
ClassTwo extends ClassOne means ClassOne is subclass.
C. Class
ClassTwo extends ClassOne means ClassTwo is super class.
D. The
class Class is the super class of all other classes in Java.
Right
Answer: A
Que.10. What is
the meaning of the return data type void?
A. An
empty memory space is returned so that developers can utilize it.
B. Void
returns no data type.
C. Void
is not supported in Java.
D. None
of the above.
Right
Answer: B
Que.11. A lower
precision can be assigned to higher precision value in Java. For exa. A byte
type data can be assigned to int type.
A. True
B. False
Right
Answer: A
Que.12. What is
the data type for the number 9.6352?
A. float.
B. double.
C. Float.
D. Double.
Right
Answer: B
Que.13. Which of
the following is synchronized?
A. Set.
B. linkedList.
C. Vector.
D. WeakHashMap.
Right
Answer: A
Que.14. To
execute the thread one after another.
A. the
keyword synchronize is used.
B. the
keyword synchronizable is used.
C. the
keyword synchronized is used.
D. None
of the above.
Right
Answer: B
Que.15. Which of
the following statements are about the Java language is true?
A. Both
procedural and OOP are supported in Java.
B. Java
supports only procedural approach towards programming.
C. Java
supports only OOP approach.
D. None
of the above.
Right
Answer: A
Que.16. If
result = 2+3*5, what is the value and type of result variable?
A. 17,
byte.
B. 25,
byte.
C. 17,
int.
D. 25,
int.
Right
Answers: C
Que.17. How many
numeric data types are supported in Java?
A. 8
B. 4
C. 2
D. 6
Right
Answers: D
Que.18. Which of
the statement is reserved word in java?
A. Run
B. Import
C. transient
D. Implement
Right
Answers: B
Que.19. Which of
the following is not a return type?
A. boolean
B. void
C. public
D. Button
Right
Answer: C
Que.20. Which of
the following statement is true?
A. An
exception can be thrown by throw keyword explicitly.
B. An
exception can be thrown by throws keyword explicitly.
Right
Answer: A
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