Java Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to Core Java. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
Answer : A
Explaination
True, Static functions can be accessed via class name or via null reference.
Answer : D
Explaination
The double data type is represented by double-precision 64-bit IEEE 754 floating point.
Answer : A
Explaination
double variable has default value of 0.0d if defined as an instance/static variable.
Q 4 - Which of the following is true about String?
Answer : B
Explaination
String object is immutable so that once it is created a String object cannot be changed. Since String is immutable it can safely be shared between many threads which are considered very important for multithreaded programming.
Q 5 - What is Abstraction?
A - Abstraction is a technique to define different methods of same type.
B - Abstraction is the ability of an object to take on many forms.
C - It refers to the ability to make a class abstract in OOP.
Answer : C
Explaination
It refers to the ability to make a class abstract in OOP. It helps to reduce the complexity and also improves the maintainability of the system.
Answer : B
Explaination
No, this is not possible.
Q 7 - Method Overloading is an example of
Answer : A
Explaination
Method Overloading is example of static binding.
Q 8 - What is Serialization?
A - Serialization is the process of writing the state of an object to another object.
B - Serialization is the process of writing the state of an object to a byte stream.
Answer : B
Explaination
Serialization is the process of writing the state of an object to a byte stream.
Answer : B
Explaination
It is not necessary that each try block must be followed by a catch block. It should be followed by either a catch block or a finally block.
Answer : D
Explaination
All threads must implement the run() method.
