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
Primitive variables like int, float are stored on Stack.
Answer : C
Explaination
The float data type is represented by single-precision 32-bit IEEE 754 floating point.
Answer : A
Explaination
char variable has default value of '\u0000' if defined as an instance/static variable.
Q 4 - Which of the following is true about private access modifier?
Answer : A
Explaination
Private access modifier is used to restrict access to variables, methods and constructors to member of same class only.
Q 5 - What is instance variable?
A - Instance variables are static variables within a class but outside any method.
B - Instance variables are variables defined inside methods, constructors or blocks.
C - Instance variables are variables within a class but outside any method.
Answer : C
Explaination
Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded.
Answer : A
Explaination
Holding the reference of the other class within some other class is known as composition. It represents a HAS-A relationship. For example, a Student has a Pen. Here Student class has Pen as its instance variable.
Q 7 - Dynamic binding uses which information for binding?
Answer : B
Explaination
Dynamic binding uses object information for binding.
Q 8 - What happens when thread's yield() method is called?
A - Thread returns to the ready state.
Answer : A
Explaination
When a task invokes its yield() method, it returns to the ready state.
Answer : A
Explaination
Deletion in linked list is fast because it involves only updating the next pointer in the node before the deleted node and updating the previous pointer in the node after the deleted node.
Q 10 - What is a marker interface?
A - marker interface is an interface with no method.
B - marker interface is an interface with single method, mark().
C - marker interface is an interface with single method, marker().
Answer : A
Explaination
Marker interface is an interface with no method.
