Data Structures and Algorithms in Java Exam Questions with Verified Solutions Graded A+
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Data Structures and Algorithms in Java
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Data Structures And Algorithms In Java
Data Structures and Algorithms in Java Exam Questions with Verified Solutions Graded A+
Public, private, protected - Answers Private: only the class in which it is declared can see it; Protected: can only be seen and used by the package in which it was declared and can be seen by subclasses or pac...
Data Structures and Algorithms in Java Exam Questions with Verified Solutions Graded A+
Public, private, protected - Answers Private: only the class in which it is declared can see it; Protected:
can only be seen and used by the package in which it was declared and can be seen by subclasses or
package members; Public: Everyone can see it
Different types of loops - Answers For, while, if
What is inheritance? - Answers Inheritance is a mechanism in which one object acquires all the
properties and behavior of another object of another class. It represents IS-A relationship. It is used for
Code Reusability and Method Overriding.
What does super mean? - Answers A reference variable that is used to refer parent class objects. Used in
derived classes. Used to call parent methods. Used to access parent class constructor.
What does static mean? - Answers variable or function is shared between all instances of that class.
Belongs to the type, not the actual objects themselves
What is an anonymous class? Why can't we write a constructor for an anonymous class? - Answers An
anonymous class is a local class without a name. It is defined and instantiated in a single succinct
expression using the 'new' operator. Since an anonymous class has no name it's not possible to write a
constructor. We must instead use a local class or an instance initializer.
How to write a class that implements an interface - Answers public class X implements YInterface
What is a set? - Answers A set is a standard generic data type that uses an array data structure.
Collection extends set.
What is a linked list? - Answers A linear data structure with a node class that has nodes connected by
pointers. Linked lists should have iterators
What are instance variables? - Answers An instance variable is a variable which is related to a single
instance of a class. Each time an instance of a class is created, the system creates one copy of the
instance variables related to that class. An instance variable is declared inside a class, but not within a
method. A variable which is defined inside a class and a method is known as a local variable. The
opposite of an instance variable is a static variable. A static variable exists across instances of a class. By
default, all variables are created as instance variables.
What is a constructor? - Answers This is a special method used to instantiate objects of a particular class.
It is used in conjunction with the new operator. It initializes an object immediately upon creation. Once
defined, it is called immediately after the object is created. When a new instance of the class is created,
the constructor is called.
What are the four principles of object oriented programming? - Answers Abstraction, encapsulation,
inheritance, polymorphism
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