Java Architecture and Concepts Quiz

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Questions and Answers

What is the main concept of encapsulation?

Data Hiding (correct)

Data Abstraction

Data Polymorphism

Data Inheritance

What is the type of architecture that Java supports?

Three-tier architecture

Multi-tier architecture (correct)

Single-tier architecture

Dual-tier architecture

To achieve encapsulation, how should variables be declared?

Private (correct)

Public

Static

Protected

What does 'Neutral Robust' mean in the context provided?

Resilient and durable Signup and view all the answers

In object-oriented programming, what do 'Class and object' represent?

Data structures Signup and view all the answers

Which inheritance is known as having one parent class and multiple child classes?

Hierarchical Signup and view all the answers

Does a constructor have a return type?

True Signup and view all the answers

What is another term for Compile time polymorphism?

Static Binding Signup and view all the answers

Which type of inheritance is not supported in Java?

Multiple Inheritance Signup and view all the answers

What is the name of the component in JDK used to find errors in a Java program?

Jdb Signup and view all the answers

What is the better approach when the number of arguments to pass in a method is unknown?

Variable arguments (varargs) Signup and view all the answers

What is the smallest individual unit of a program known as in Java?

Token Signup and view all the answers

What is the term used when a child class overwrites a method of the parent class?

Overriding Signup and view all the answers

What is the purpose of 'Javac' in Java?

Compiler of Java code Signup and view all the answers

What is the term for a constructor with no arguments?

Default constructor Signup and view all the answers

How are static variables different from non-static variables?

Static variables are accessed by static methods only Signup and view all the answers

How is runtime polymorphism achieved in Java?

Dynamic Binding Signup and view all the answers

What is the term used to describe exiting from a specific case when it is inside another 'if' statement?

Nested if Signup and view all the answers

Which loop executes its statements at least once without checking the condition initially?

Do-while loop Signup and view all the answers

What is the term for converting one data type into another data type in programming?

Data conversion Signup and view all the answers

Which type of loop has a terminating semicolon at the end of its structure?

Do-while loop Signup and view all the answers

What are the jumping statements available in Java for altering the flow of control?

'Break' and 'continue' Signup and view all the answers

Which type of array stores data in a matrix form with both row and column sizes defined?

Multi-dimensional array Signup and view all the answers

Study Notes

Java Basics

Java supports Neutral/Robust architecture
Java is an Object-Oriented Programming (OOP) language

Java Compiler and JDK Components

javac is the compiler of Java
Javah is the component of JDK that produces header files
Java is the component of JDK used to execute or run the application
Jdb is the component of JDK used to find errors in the program

Java Program Structure

A Java program should have the same name as the class name
Java programs should be saved with a .java extension
NetBeans and Eclipse are provided by Java as editors or platforms

Data Types

Short requires 16 bits (2 bytes)
Int requires 32 bits (4 bytes)
Boolean data type can only have values of true or false
Char requires 16 bits (2 bytes)

Tokens and Operators

There are 5 types of tokens in Java: Variables, Operators, Keywords, Special Characters, and Literals
Literals mean the actual value
Assignment Operator is also known as the Shorthand Operator
Conditional Operator is also known as the Ternary Operator
Instanceof is the operator used to test whether an object is an instance of the specified type
Relational operator is also known as the Comparison operator

Control Structures

Switch case is used when we have multiple options
Break in switch case is used to exit the switch block
Class is a template from which objects are created
Encapsulation is the wrapping of variables and methods in a single unit
The main concept of encapsulation is Data Hiding

Inheritance

The parent-child concept is known as Inheritance
The main advantage of inheritance is Reusability
Multiple Inheritance is not supported in Java
Hierarchical inheritance has one parent class and multiple child classes
Multilevel inheritance is a combination of more than one type of inheritance

Polymorphism

Compile-time polymorphism is also known as Static binding
Runtime polymorphism is also known as Dynamic Binding
Method overloading is a type of compile-time polymorphism

Constructors

A constructor has the same name as the class name
A constructor does not have a return type
A constructor with no arguments is known as the Default constructor
A constructor with parameters is known as the Parameterized constructor

Static Variables

Static variables can be accessed by both static and non-static methods
Static variables are like global variables
Non-static variables are like local variables

Variables and Methods

Varargs uses ellipsis (…)
Varargs is used when the number of arguments is unknown

Loops and Jumping Statements

A do-while loop is known as an Exit controlled loop
A for loop is known as an Entry controlled loop
Break and Continue are the jumping statements in Java
Break is used to immediately exit from a loop or program

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Description

Test your knowledge on Java architecture, concepts, and components with this quiz. Questions cover topics like Java compiler, JDK components, naming conventions, and file extensions.