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.
Q 1 - What is a class in java?
B - class is a special data type.
Answer : A
Explaination
A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.
Answer : B
Explaination
The char data type is represented by single 16-bit Unicode character.
Minimum value: '\u0000' (or 0)
Maximum value: '\uffff' (or 65,535)
Answer : B
Explaination
float variable has default value of 0.0f 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.
Q 6 - What is JRE?
A - JRE is a java based GUI application.
B - JRE is an application development framework.
C - JRE is an implementation of the Java Virtual Machine which executes Java programs.
Answer : C
Explaination
Java Runtime Environment is an implementation of the Java Virtual Machine which executes Java programs. It provides the minimum requirements for executing a Java application.
Q 7 - What is true about a final class?
A - class declard final is a final class.
B - Final classes are created so the methods implemented by that class cannot be overridden.
Answer : D
Explaination
Final classes are created so the methods implemented by that class cannot be overridden. It can't be inherited. These classes are declared final.
Q 8 - What is Deserialization?
A - Deserialization is the process of restoring state of an object from a byte stream.
B - Serialization is the process of restoring state of an object from an object.
Answer : A
Explaination
Deserialization is the process of restoring state of an object from a byte stream.
Q 9 - What will happen if static modifier is removed from the signature of the main method?
B - RunTime Error: NoSuchMethodError.
C - Program will compile and run without any output.
D - Program will compile and run to show the required output.
Answer : B
Explaination
Program throws "NoSuchMethodError" error at runtime.
Q 10 - In which case, a program is expected to recover?
Answer : B
Explaination
A program is expected to recover if an exception occurs.
