Core Java - Java (MCQ) questions and answers
Dear Readers, Welcome to Core Java multiple choice questions and answers with
explanation. These objective type Core Java questions are very important for campus placement test and job interviews. Specially developed for the Networking freshers and professionals, these model questions are asked in the online technical test and interview of many IT companies.
1) Unchecked exceptions are checked at compile-time rather they are checked at runtime.
- Published on 19 Oct 15
a. True
b. False
|
Answer
Explanation
|
ANSWER: False
Explanation:
No explanation is available for this question!
|
|
2) Which method returns the interrupted flag after that it sets the flag to false if it is true?
- Published on 19 Oct 15
a. isInterrupted()
b. static interrupted()
c. non static interrupted()
d. Both A & C
|
Answer
Explanation
|
ANSWER: static interrupted()
Explanation:
No explanation is available for this question!
|
|
3) The PipedInputStream and PipedOutputStream classes can be used to read and write data simultaneously.
- Published on 19 Oct 15
a. True
b. False
|
Answer
Explanation
|
ANSWER: True
Explanation:
No explanation is available for this question!
|
|
4) From the following statements which is a disadvantage of an java array?
- Published on 19 Oct 15
a. An array can hold primitive types data
b. An array has its size that is known as array length
c. An array knows only its type that it contains. Array type is checked at the compile-time
d. An array holds only one type of data
|
Answer
Explanation
|
ANSWER: An array holds only one type of data
Explanation:
No explanation is available for this question!
|
|
5) The following Syntax is used for?
class Subclass-name extends Superclass-name
{
//methods and fields
}
- Published on 19 Oct 15
a. Polymorphism
b. Encapsulation
c. Inheritance
d. None of the above
|
Answer
Explanation
|
ANSWER: Inheritance
Explanation:
No explanation is available for this question!
|
|
6) ResultSetMetaData interface is useful because it provides methods to get metadata from the ResultSet object.
- Published on 22 Jul 15
a. True
b. False
|
Answer
Explanation
|
ANSWER: True
Explanation:
No explanation is available for this question!
|
|
7) Which constructor creates an empty string buffer with the specified capacity as length.
- Published on 22 Jul 15
a. StringBuffer()
b. StringBuffer(String str)
c. StringBuffer(int capacity)
d. None of the above
|
Answer
Explanation
|
ANSWER: StringBuffer(int capacity)
Explanation:
No explanation is available for this question!
|
|
8) How many reserved keywords are currently defined in the Java language?
- Published on 22 Jul 15
a. 48
b. 49
c. 50
d. 47
|
Answer
Explanation
|
ANSWER: 49
Explanation:
No explanation is available for this question!
|
|
9) Which mechanism is used when a thread is paused running in its critical section and another thread is allowed to enter (or lock) in the same critical section to be executed?
- Published on 22 Jul 15
a. Inter-thread communication
b. Initial-thread communication
c. Mutual Exclusive
d. None of the above
|
Answer
Explanation
|
ANSWER: Inter-thread communication
Explanation:
No explanation is available for this question!
|
|
10) Which method is used to change the name of a thread?
- Published on 22 Jul 15
a. public String getName()
b. public void setName(String name)
c. public void getName()
d. public String setName(String name)
|
Answer
Explanation
|
ANSWER: public void setName(String name)
Explanation:
No explanation is available for this question!
|
|
