Java Interview 2025/2026 Exam
Questions Marking Scheme New Update
1
| A+ Rated
What are Encapsulation, Inheritance and Polymorphism? - 🧠 ANSWER
✔✔Encapsulation is the mechanism that binds together code and data it
manipulates and keeps both safe from outside interference and misuse.
Inheritance is the process by which one object acquires the properties of
another object. Polymorphism is the feature that allows one interface to be
used for general class actions.
What is the difference between Assignment and Initialization? - 🧠 ANSWER
✔✔Assignment can be done as many times as desired whereas
initialization can be done only once.
What is OOPs? - 🧠 ANSWER ✔✔Object oriented programming organizes a
program around its data, i. e. , objects and a set of well defined interfaces
to that data. An object-oriented program can be characterized as data
controlling access to code.
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,What are Class, Constructor and Primitive data types? - 🧠 ANSWER
✔✔Class is a template for multiple objects with similar features and it is a
2
blue print for objects. It defines a type of object according to the data the
object can hold and the operations the object can perform. Constructor is a
special kind of method that determines how an object is initialized when
created. Primitive data types are 8 types and they are: byte, short, int, long,
float, double, boolean, char.
What is an Object and how do you allocate memory to it? - 🧠 ANSWER
✔✔Object is an instance of a class and it is a software unit that combines a
structured set of data with a set of operations for inspecting and
manipulating that data. When an object is created using new operator,
memory is allocated to it.
What is the difference between constructor and method? - 🧠 ANSWER
✔✔Constructor will be automatically invoked when an object is created
whereas method has to be called explicitly.
What are methods and how are they defined? - 🧠 ANSWER ✔✔Methods
are functions that operate on instances of classes in which they are
defined. Objects can communicate with each other using methods and can
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,call methods in other classes. Method definition has four parts. They are
name of the method, type of object or primitive type the method returns, a
3
list of parameters and the body of the method. A method's signature is a
combination of the first three parts mentioned above.
What is the use of bin and lib in JDK? - 🧠 ANSWER ✔✔Bin contains all
tools such as javac, appletviewer, awt tool, etc., whereas lib contains API
and all packages.
What is casting? - 🧠 ANSWER ✔✔Casting is used to convert the value of
one type to another.
How many ways can an argument be passed to a subroutine and explain
them? - 🧠 ANSWER ✔✔An argument can be passed in two ways. They are
passing by value and passing by reference. Passing by value: This method
copies the value of an argument into the formal parameter of the
subroutine. Passing by reference: In this method, a reference to an
argument (not the value of the argument) is passed to the parameter.
What is the difference between an argument and a parameter? - 🧠
ANSWER ✔✔While defining method, variables passed in the method are
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, called parameters. While using those methods, values passed to those
variables are called arguments.
4
What are different types of access modifiers? - 🧠 ANSWER ✔✔public: Any
thing declared as public can be accessed from anywhere. private: Any
thing declared as private can't be seen outside of its class. protected: Any
thing declared as protected can be accessed by classes in the same
package and subclasses in the other packages. default modifier : Can be
accessed only to classes in the same package.
What is final, finalize() and finally? - 🧠 ANSWER ✔✔final : final keyword
can be used for class, method and variables. A final class cannot be
subclassed and it prevents other programmers from subclassing a secure
class to invoke insecure methods. A final method can't be overridden. A
final variable can't change from its initialized value. finalize() : finalize()
method is used just before an object is destroyed and can be called just
prior to garbage collection. finally : finally, a key word used in exception
handling, creates a block of code that will be executed after a try/catch
block has completed and before the code following the try/catch block. The
finally block will execute whether or not an exception is thrown. For
example, if a method opens a file upon exit, then you will not want the code
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
Questions Marking Scheme New Update
1
| A+ Rated
What are Encapsulation, Inheritance and Polymorphism? - 🧠 ANSWER
✔✔Encapsulation is the mechanism that binds together code and data it
manipulates and keeps both safe from outside interference and misuse.
Inheritance is the process by which one object acquires the properties of
another object. Polymorphism is the feature that allows one interface to be
used for general class actions.
What is the difference between Assignment and Initialization? - 🧠 ANSWER
✔✔Assignment can be done as many times as desired whereas
initialization can be done only once.
What is OOPs? - 🧠 ANSWER ✔✔Object oriented programming organizes a
program around its data, i. e. , objects and a set of well defined interfaces
to that data. An object-oriented program can be characterized as data
controlling access to code.
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,What are Class, Constructor and Primitive data types? - 🧠 ANSWER
✔✔Class is a template for multiple objects with similar features and it is a
2
blue print for objects. It defines a type of object according to the data the
object can hold and the operations the object can perform. Constructor is a
special kind of method that determines how an object is initialized when
created. Primitive data types are 8 types and they are: byte, short, int, long,
float, double, boolean, char.
What is an Object and how do you allocate memory to it? - 🧠 ANSWER
✔✔Object is an instance of a class and it is a software unit that combines a
structured set of data with a set of operations for inspecting and
manipulating that data. When an object is created using new operator,
memory is allocated to it.
What is the difference between constructor and method? - 🧠 ANSWER
✔✔Constructor will be automatically invoked when an object is created
whereas method has to be called explicitly.
What are methods and how are they defined? - 🧠 ANSWER ✔✔Methods
are functions that operate on instances of classes in which they are
defined. Objects can communicate with each other using methods and can
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,call methods in other classes. Method definition has four parts. They are
name of the method, type of object or primitive type the method returns, a
3
list of parameters and the body of the method. A method's signature is a
combination of the first three parts mentioned above.
What is the use of bin and lib in JDK? - 🧠 ANSWER ✔✔Bin contains all
tools such as javac, appletviewer, awt tool, etc., whereas lib contains API
and all packages.
What is casting? - 🧠 ANSWER ✔✔Casting is used to convert the value of
one type to another.
How many ways can an argument be passed to a subroutine and explain
them? - 🧠 ANSWER ✔✔An argument can be passed in two ways. They are
passing by value and passing by reference. Passing by value: This method
copies the value of an argument into the formal parameter of the
subroutine. Passing by reference: In this method, a reference to an
argument (not the value of the argument) is passed to the parameter.
What is the difference between an argument and a parameter? - 🧠
ANSWER ✔✔While defining method, variables passed in the method are
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, called parameters. While using those methods, values passed to those
variables are called arguments.
4
What are different types of access modifiers? - 🧠 ANSWER ✔✔public: Any
thing declared as public can be accessed from anywhere. private: Any
thing declared as private can't be seen outside of its class. protected: Any
thing declared as protected can be accessed by classes in the same
package and subclasses in the other packages. default modifier : Can be
accessed only to classes in the same package.
What is final, finalize() and finally? - 🧠 ANSWER ✔✔final : final keyword
can be used for class, method and variables. A final class cannot be
subclassed and it prevents other programmers from subclassing a secure
class to invoke insecure methods. A final method can't be overridden. A
final variable can't change from its initialized value. finalize() : finalize()
method is used just before an object is destroyed and can be called just
prior to garbage collection. finally : finally, a key word used in exception
handling, creates a block of code that will be executed after a try/catch
block has completed and before the code following the try/catch block. The
finally block will execute whether or not an exception is thrown. For
example, if a method opens a file upon exit, then you will not want the code
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
