Test

Day 1 – Java Platform

Topics:

JDK vs JRE vs JVM
Java Editions (SE, EE, ME)
Java Features
Java Compilation Process
Bytecode
JVM Languages
Java Program Structure
IDE Setup
Java Versions (8, 11, 17, 21 Overview)

Practice Programs:

Hello World
Print Your Name
Print Multiple Lines
Print Java Version
Command Line Arguments
Simple Calculator
Swap Two Numbers
Print ASCII Values
Print Unicode Character
Basic Pattern Program

Interview Questions:

Why Java is platform independent?
Difference between JDK, JRE and JVM?
What is Bytecode?
Why is main() static?
Why String[] args?
Can we overload main()?
What are Java Editions?
What are new features in Java 8?

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Day 2 – Variables & Operators

Topics:

Variables
Primitive Data Types
Reference Data Types
Literals
Type Casting
Type Conversion
Operators
Operator Precedence
Ternary Operator

Practice Programs:

Swap Numbers
Area of Circle
Simple Interest
Temperature Conversion
Calculator
Largest Number
Even or Odd
Grade Calculator
ASCII to Character
Character to ASCII

Interview Questions:

Primitive vs Reference Types?
Implicit vs Explicit Casting?
What is Type Promotion?
Difference between == and =?
Difference between && and &?
Difference between || and |?
What is instanceof?
What is Operator Precedence?

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Day 3 – Control Statements & Loops

Topics:

if
if-else
Nested if
switch
Enhanced Switch
for Loop
while Loop
do-while Loop
break
continue

Practice Programs:

Prime Number
Palindrome Number
Armstrong Number
Factorial
Fibonacci
Reverse Number
Sum of Digits
Leap Year
LCM
HCF

Interview Questions:

for vs while?
while vs do-while?
switch vs if-else?
Can switch use String?
break vs continue?
Infinite Loop?
Nested Loop?
Enhanced Switch?

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Day 4 – Methods & Arrays

Topics:

Method Declaration

Method Overloading

Arguments & Parameters

Return Type

Pass by Value

Recursion Basics

Arrays

Enhanced for Loop

Array Utility Methods

Practice Programs:

Calculator using Methods

Factorial Method

Prime Method

Largest in Array

Smallest in Array

Reverse Array

Linear Search

Binary Search

Bubble Sort

Sum of Array

Interview Questions:

Method Overloading?

Can methods return objects?

Pass by Value in Java?

Why array size is fixed?

Array vs ArrayList?

Can array store objects?

Enhanced for Loop?

Recursion vs Loop?

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Day 5 – Strings & Wrapper Classes

Topics:

String

String Pool

Immutable String

String Methods

StringBuilder

StringBuffer

Wrapper Classes

Autoboxing

Unboxing

Practice Programs:

Reverse String

Palindrome String

Anagram

Count Vowels

Count Words

Duplicate Characters

Character Frequency

String Compression

StringBuilder Example

Wrapper Conversion

Interview Questions:

Why String is Immutable?

StringBuilder vs StringBuffer?

== vs equals()?

What is String Pool?

intern() Method?

Autoboxing?

Wrapper Classes?

parseInt() vs valueOf()?

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Day 6 – Classes & Objects

Topics:

Class

Object

Fields

Methods

Constructors

this Keyword

Object Creation

Reference Variables

Practice Programs:

Student Class

Employee Class

Car Class

Book Class

Bank Account

Rectangle

Circle

Mobile

Laptop

Person

Interview Questions:

Class vs Object?

Constructor vs Method?

this Keyword?

Reference Variable?

Object Creation?

Can constructor be private?

Default Constructor?

Memory allocation for Objects?

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Day 7 – OOP Principles

Topics:

Encapsulation

Inheritance

Method Overriding

Polymorphism

Dynamic Binding

super Keyword

IS-A Relationship

HAS-A Relationship

Practice Programs:

Animal

Vehicle

Employee

Bank

Shape

Person

Teacher

Doctor

Manager

Product

Interview Questions:

Encapsulation?

Inheritance Types?

Method Overriding?

IS-A vs HAS-A?

Compile Time vs Runtime Polymorphism?

super Keyword?

Can static methods be overridden?

Covariant Return Type?

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Day 8 – Abstraction & Interfaces

Topics:

Abstraction

Abstract Class

Abstract Method

Interface

Default Method

Static Method

Multiple Interfaces

Packages

Access Modifiers

Practice Programs:

Shape

Vehicle

Payment

Printer

Notification

Employee

Bank

Remote

Smart Device

Animal

Interview Questions:

Interface vs Abstract Class?

Can Interface have Constructors?

Multiple Inheritance?

Default Methods?

Marker Interface?

public vs protected?

Package?

Why Abstraction?

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Day 9 – Exception Handling

Topics:

Exception Hierarchy

Checked Exception

Unchecked Exception

try-catch

finally

throw

throws

Custom Exception

Practice Programs:

Division Example

Age Validation

ATM Withdrawal

Multiple Catch

Nested Try

Custom Exception

NullPointer Example

File Exception

throws Example

finally Example

Interview Questions:

Checked vs Unchecked Exception?

throw vs throws?

finally Block?

Custom Exception?

Exception Hierarchy?

Can finally not execute?

Multiple Catch?

Best Practices?

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Day 10 – Collections Framework

Topics:

Collection Framework

Collection Interface

List

Set

Queue

Map Overview

Iterator

Iterable

Practice Programs:

ArrayList Demo

LinkedList Demo

HashSet Demo

Queue Demo

HashMap Demo

Iterator Example

Student Collection

Employee Collection

Duplicate Finder

Frequency Counter

Interview Questions:

Collection vs Collections?

Iterator?

Fail Fast vs Fail Safe?

Why Collections Framework?

List vs Set?

Queue?

Map?

Iterable?

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Day 11 – List, Set & Queue

Topics:

ArrayList

LinkedList

Vector

Stack

HashSet

LinkedHashSet

TreeSet

PriorityQueue

ArrayDeque

Practice Programs:

Student CRUD

Employee CRUD

Sort List

Remove Duplicates

Unique Elements

Queue Example

Priority Queue

Deque Example

Stack Example

TreeSet Sorting

Interview Questions:

ArrayList vs LinkedList?

Vector vs ArrayList?

HashSet vs TreeSet?

Queue vs Deque?

PriorityQueue?

Stack Class?

LinkedHashSet?

TreeSet?

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Day 12 – Map, Generics & Enums

Topics:

HashMap

LinkedHashMap

TreeMap

Hashtable

Generics

Generic Class

Generic Method

Enums

Practice Programs:

Word Count

Student Marks

Phone Book

Voting System

Frequency Map

Generic Box

Pair Class

Enum Switch

Enum Values

Sort Map

Interview Questions:

HashMap Internal Working?

HashMap vs Hashtable?

TreeMap?

Load Factor?

Collision?

Generics?

Type Erasure?

Enum?

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Day 13 – Java 8 Features

Topics:

Lambda Expressions

Functional Interface

Built-in Functional Interfaces

Method Reference

Predicate

Function

Consumer

Supplier

Practice Programs:

Lambda Comparator

Runnable Lambda

Predicate Example

Consumer Example

Supplier Example

Function Example

Method Reference

Sort using Lambda

Filter List

Calculator using Lambda

Interview Questions:

Lambda Expression?

Functional Interface?

Method Reference?

@FunctionalInterface?

Predicate?

Consumer?

Supplier?

Advantages of Lambda?

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Day 14 – Stream API & Optional

Topics:

Stream API

filter()

map()

sorted()

distinct()

collect()

reduce()

Optional

Date & Time API

Practice Programs:

Even Numbers

Odd Numbers

Sort Employees

Max Salary

Second Highest Salary

Duplicate Elements

Group Students

Optional Example

Current Date

Age Calculator

Interview Questions:

Stream vs Collection?

Intermediate Operations?

Terminal Operations?

Parallel Stream?

Optional?

orElse() vs orElseGet()?

map() vs flatMap()?

Date API Advantages?

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Day 15 – Multithreading

Topics:

Thread

Runnable

Thread Lifecycle

Synchronization

volatile

ExecutorService

Callable

Future

Thread Pool

Practice Programs:

Create Thread

Runnable Example

Even Odd Thread

Synchronization Demo

Counter Example

Bank Account

Callable Example

Future Example

Fixed Thread Pool

Scheduled Executor

Interview Questions:

Thread vs Process?

Runnable vs Thread?

start() vs run()?

Synchronization?

Race Condition?

Deadlock?

Callable vs Runnable?

ExecutorService?

Day 16 – JDBC

Topics:

JDBC Architecture

JDBC Drivers

DriverManager

Connection

Statement

PreparedStatement

ResultSet

Batch Processing

Transaction Management Basics

Practice Programs:

Connect to MySQL

Insert Record

Update Record

Delete Record

Fetch Records

Batch Insert

Commit & Rollback Example

Student CRUD

Interview Questions:

What is JDBC?

Types of JDBC Drivers?

Statement vs PreparedStatement?

PreparedStatement vs CallableStatement?

What is ResultSet?

What is Batch Processing?

What is Transaction?

Why PreparedStatement is preferred?

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Day 17 – SQL for Java Developers

Topics:

DDL

DML

DCL

TCL

Constraints

Joins

Group By

Having

Indexes

Views

Practice Programs:

Create Student Table

Insert Records

Inner Join

Left Join

Group By Example

Top N Salary

Second Highest Salary

Pagination Query

Index Example

Transaction Example

Interview Questions:

Primary Key vs Unique Key?

Clustered vs Non-Clustered Index?

Inner Join vs Left Join?

Where vs Having?

Delete vs Truncate vs Drop?

What is Normalization?

What is ACID?

What is Index?

————————————————————

Day 18 – Maven & Gradle

Topics:

Build Tools

Maven Architecture

Project Structure

pom.xml

Dependencies

Scopes

Plugins

Maven Lifecycle

Gradle Basics

Practice Programs:

Create Maven Project

Add MySQL Dependency

Add Lombok

Build JAR

Run Maven Commands

Dependency Management

Create Executable JAR

Multi Module Overview

Interview Questions:

Why Maven?

Maven Lifecycle?

Compile vs Package vs Install?

Dependency Scope?

What is pom.xml?

What is Repository?

Gradle vs Maven?

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Day 19 – Git & GitHub

Topics:

Version Control

Git Architecture

Repository

Commit

Branch

Merge

Clone

Pull

Push

GitHub Workflow

Practice Programs:

Initialize Repository

Commit Changes

Create Branch

Merge Branch

Resolve Conflict

Push to GitHub

Clone Repository

Create Pull Request

Interview Questions:

Git vs GitHub?

git fetch vs git pull?

Merge vs Rebase?

Cherry Pick?

Stash?

HEAD?

Conflict Resolution?

Why Version Control?

————————————————————

Day 20 – Logging & Lombok

Topics:

Logging Basics

SLF4J

Logback

Log Levels

Logger Configuration

Lombok

@Data

@Getter

@Setter

@Builder

Practice Programs:

Logger Example

Different Log Levels

Custom Logger

Lombok POJO

@Builder Example

Logging Exception

Logging REST API

Application Logs

Interview Questions:

Why Logging?

Log Levels?

SLF4J?

Logback?

Why Lombok?

@Data vs @Getter/@Setter?

@Builder?

Why avoid System.out.println()?

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Day 21 – Spring Framework Fundamentals

Topics:

Spring Framework

Modules of Spring

IoC

Dependency Injection

Beans

Bean Factory

ApplicationContext

Spring Architecture

Practice Programs:

First Spring Project

Create Bean

Bean Injection

ApplicationContext Demo

Multiple Beans

Student Bean

Employee Bean

Configuration Example

Interview Questions:

What is Spring?

Why Spring?

IoC?

Dependency Injection?

Bean?

BeanFactory vs ApplicationContext?

Advantages of Spring?

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Day 22 – Dependency Injection & Bean Management

Topics:

Constructor Injection

Setter Injection

@Autowired

@Component

@Bean

@Configuration

Bean Scope

Bean Lifecycle

Practice Programs:

Constructor Injection Demo

Setter Injection Demo

@Autowired Example

Singleton Bean

Prototype Bean

Bean Lifecycle Demo

Java Config Example

Student Service

Interview Questions:

Constructor vs Setter Injection?

@Autowired?

@Component vs @Bean?

Bean Scope?

Singleton vs Prototype?

Bean Lifecycle?

@RequiredArgsConstructor?

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Day 23 – Spring Core Annotations

Topics:

@Component

@Service

@Repository

@Controller

@RestController

@Autowired

@Primary

@Qualifier

@ComponentScan

Practice Programs:

Layered Application

Student Service

Employee Service

Bean Qualifier

Primary Bean

Controller Demo

Component Scan Example

Repository Example

Interview Questions:

@Component vs @Service?

@Controller vs @RestController?

@Repository?

@Qualifier?

@Primary?

Why Layered Architecture?

————————————————————

Day 24 – Spring Boot Introduction

Topics:

Spring Boot

Spring Initializr

Auto Configuration

Starter Dependencies

Project Structure

Embedded Tomcat

application.properties

application.yml

Practice Programs:

Create Spring Boot Project

Hello REST API

Configuration Example

Custom Properties

Read Property Value

Profile Demo

Starter Dependency Example

Run Application

Interview Questions:

Spring vs Spring Boot?

What is Auto Configuration?

Starter Dependencies?

Embedded Server?

Why Spring Boot?

application.properties vs YAML?

@SpringBootApplication?

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Day 25 – REST API Development

Topics:

REST Architecture

HTTP Methods

@PathVariable

@RequestParam

@RequestBody

ResponseEntity

Response Status

CRUD APIs

Practice Programs:

Student CRUD API

Employee CRUD API

Search API

Pagination API

ResponseEntity Example

Validation API

Custom Response

Delete API

Interview Questions:

REST vs SOAP?

GET vs POST?

PUT vs PATCH?

@PathVariable vs @RequestParam?

@ResponseStatus?

Why ResponseEntity?

Idempotent Methods?

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Day 26 – Spring Data JPA

Topics:

JPA Introduction

Hibernate Overview

Entity

@Table

@Id

@GeneratedValue

Repository

CrudRepository

JpaRepository

Practice Programs:

Student CRUD

Employee CRUD

Save Entity

Update Entity

Delete Entity

Find By Id

Find All

Custom Repository

Interview Questions:

JPA vs Hibernate?

CrudRepository vs JpaRepository?

@Entity?

Persistence Context?

@GeneratedValue?

Entity Lifecycle?

Why ORM?

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Day 27 – JPA Relationships

Topics:

One-to-One

One-to-Many

Many-to-One

Many-to-Many

Cascade Types

Fetch Types

MappedBy

Orphan Removal

Practice Programs:

Student-Course

Department-Employee

User-Address

Order-Items

Author-Book

Company-Employee

Category-Product

Customer-Order

Interview Questions:

FetchType.LAZY vs EAGER?

Cascade Types?

mappedBy?

Owning Side?

N+1 Problem?

OneToMany?

ManyToMany?

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Day 28 – Validation & Exception Handling

Topics:

Bean Validation

@NotNull

@NotBlank

@Valid

Custom Validation

@ControllerAdvice

@ExceptionHandler

Global Exception Handling

Practice Programs:

User Validation

Student Validation

Custom Exception

Global Exception Handler

Validation Error Response

Age Validation

Email Validation

Password Validation

Interview Questions:

@Valid?

@NotNull vs @NotBlank?

@ControllerAdvice?

@ExceptionHandler?

Custom Validation?

Global Exception Handling?

Validation Flow?

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Day 29 – Spring Boot Advanced Features

Topics:

Pagination

Sorting

Derived Query Methods

Custom Query

JPQL Basics

Native Query

Profiles

Configuration Properties

Practice Programs:

Pagination API

Sorting API

Find By Name

Find By Email

Custom Query

Search API

Profile Demo

Configuration Example

Interview Questions:

JPQL vs Native Query?

Pagination?

Sorting?

Derived Queries?

@Query?

Profiles?

@ConfigurationProperties?

————————————————————

Day 30 – Testing, Swagger & Postman

Topics:

JUnit 5

Mockito Basics

@SpringBootTest

MockMvc Overview

Swagger/OpenAPI

Postman

Actuator Basics

API Documentation

Practice Programs:

Unit Test Service

Mock Repository

Controller Test

Swagger Integration

Postman Collection

Health Endpoint

Info Endpoint

API Testing

Interview Questions:

JUnit?

Mockito?

@SpringBootTest?

MockMvc?

Swagger?

Postman?

Actuator?

Unit Test vs Integration Test?

Day 31 – Spring Security Fundamentals

Topics:

Spring Security Overview

Authentication

Authorization

SecurityFilterChain

In-Memory Authentication

PasswordEncoder

BCryptPasswordEncoder

Security Configuration

PermitAll()

Authenticated()

Practice Programs:

Secure REST API

In-Memory Login

Basic Authentication

Role Based API

Password Encoding

Public & Private APIs

Custom Security Config

Disable CSRF Example

Interview Questions:

What is Spring Security?

Authentication vs Authorization?

Why PasswordEncoder?

Why BCrypt?

What is SecurityFilterChain?

What is CSRF?

Why is Spring Security needed?

Basic Authentication vs Form Login?

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Day 32 – JWT Authentication

Topics:

JWT Introduction

JWT Structure

Header

Payload

Signature

Token Generation

Token Validation

JWT Filter

Authentication Flow

Practice Programs:

Generate JWT

Validate JWT

JWT Login API

Secure REST API

Extract Username

JWT Filter Demo

Token Expiration

Custom UserDetailsService

Interview Questions:

What is JWT?

JWT Structure?

Why JWT?

How JWT works?

JWT vs Session?

Can JWT be revoked?

What is UserDetailsService?

Why Stateless Authentication?

————————————————————

Day 33 – Role Based Authorization

Topics:

Roles

Authorities

Method Level Security

@PreAuthorize

UserDetails

UserDetailsService

Custom Authentication

Access Control

Practice Programs:

Admin/User Login

Role Based APIs

Admin Dashboard API

User Dashboard API

Role Validation

Custom UserDetails

Protected Endpoints

Access Denied Example

Interview Questions:

Role vs Authority?

@PreAuthorize?

UserDetails?

UserDetailsService?

403 vs 401?

Method Level Security?

RBAC?

Access Control?

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Day 34 – Microservices Fundamentals

Topics:

Monolithic Architecture

Microservices Architecture

Advantages

Challenges

Service Communication

Independent Deployment

Scalability

Microservice Design Basics

Practice Programs:

Create Two Services

User Service

Product Service

REST Communication

Service Separation

Independent Deployment

Configuration Example

Simple Backend System

Interview Questions:

Monolith vs Microservices?

Advantages of Microservices?

Challenges?

When should Microservices be used?

Service Communication?

Independent Deployment?

Scalability?

Distributed System?

————————————————————

Day 35 – Eureka Service Discovery

Topics:

Service Discovery

Netflix Eureka

Eureka Server

Eureka Client

Service Registration

Service Discovery Process

Application Configuration

Dashboard Overview

Practice Programs:

Create Eureka Server

Discover Services

Run Multiple Services

Configuration Demo

Dashboard Demo

Client Registration

Interview Questions:

Why Eureka?

Service Discovery?

Eureka Server?

Eureka Client?

Benefits of Service Discovery?

Can Microservices work without Eureka?

How services communicate?

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Day 36 – OpenFeign & API Gateway

Topics:

OpenFeign

Declarative REST Client

API Gateway

Request Routing

Load Balancing Basics

Gateway Configuration

Filters Overview

Centralized Entry Point

Practice Programs:

Feign Client Demo

User Calls Product Service

Gateway Setup

Route APIs

Gateway Filters

Central API Entry

Microservice Communication

Gateway Testing

Interview Questions:

OpenFeign?

Feign vs RestTemplate?

Why API Gateway?

Benefits of Gateway?

Centralized Routing?

Gateway Filters?

Client Side Communication?

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Day 37 – Resilience4j

Topics:

Fault Tolerance

Circuit Breaker

Retry

Fallback Method

Timeout Basics

Resilience4j Overview

Failure Handling

Service Reliability

Practice Programs:

Circuit Breaker Demo

Retry Example

Fallback API

Simulate Service Failure

Timeout Example

External API Call

Failure Handling

Resilience Configuration

Interview Questions:

What is Circuit Breaker?

Why Retry?

Fallback?

Why Resilience4j?

Fault Tolerance?

Service Failure Handling?

Retry vs Circuit Breaker?

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Day 38 – Spring Cloud Config

Topics:

Centralized Configuration

Config Server

Config Client

Git Based Configuration

Property Refresh

Environment Profiles

Configuration Management

External Configuration

Practice Programs:

Config Server Setup

Config Client Setup

Load Properties

External Configuration

Multiple Profiles

Git Configuration

Refresh Configuration

Configuration Demo

Interview Questions:

Why Config Server?

Centralized Configuration?

Config Server vs application.properties?

Benefits of External Configuration?

Spring Cloud Config?

Configuration Refresh?

————————————————————

Day 39 – Docker Fundamentals

Topics:

Docker Introduction

Containers

Images

Dockerfile

Docker Commands

Docker Hub

Docker Compose

Container Lifecycle

Practice Programs:

Install Docker

Create Dockerfile

Build Image

Run Container

Dockerize Spring Boot App

Push Image

Pull Image

Docker Compose Demo

Interview Questions:

Docker vs Virtual Machine?

Image vs Container?

Dockerfile?

Docker Compose?

Benefits of Docker?

Container Lifecycle?

Why Docker?

————————————————————

Day 40 – Linux Basics for Java Developers

Topics:

Linux File System

Basic Commands

File Permissions

Process Management

Environment Variables

Package Installation

Network Commands

Log Files

Practice Programs:

Navigate Directories

Manage Files

Change Permissions

View Processes

Kill Process

Read Logs

Environment Variables Demo

Application Deployment

Interview Questions:

Why Linux?

chmod?

ps Command?

grep Command?

tail Command?

Environment Variables?

Why Java applications are deployed on Linux?

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Day 41 – Kafka Basics

Topics:

Apache Kafka

Producer

Consumer

Topic

Partition

Offset

Broker

Message Flow

Practice Programs:

Kafka Setup

Producer Example

Consumer Example

Send Message

Receive Message

Multiple Messages

Topic Creation

Spring Boot Kafka Demo

Interview Questions:

What is Kafka?

Producer?

Consumer?

Topic?

Partition?

Offset?

Kafka vs RabbitMQ?

Kafka Use Cases?

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Day 42 – Redis Basics

Topics:

Redis Overview

Caching

Key Value Store

TTL

Spring Cache

Cache Eviction

Redis Configuration

Common Use Cases

Practice Programs:

Install Redis

Store Data

Retrieve Data

Cache API Response

TTL Example

Cache Student Data

Spring Cache Demo

Redis Integration

Interview Questions:

What is Redis?

Why Redis?

Cache vs Database?

TTL?

Redis Use Cases?

When to use Redis?

Advantages of Redis?

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Day 43 – REST API Best Practices

Topics:

REST Standards

Naming Conventions

HTTP Status Codes

Exception Handling

Validation

Pagination Basics

Versioning Overview

API Documentation

Practice Programs:

Design Clean REST API

Proper Response Format

Error Response

Pagination API

Validation Example

Status Code Example

Swagger Documentation

Refactor Existing API

Interview Questions:

REST Best Practices?

HTTP Status Codes?

PUT vs PATCH?

Why Pagination?

API Versioning?

Consistent Response Format?

REST Naming Conventions?

————————————————————

Day 44 – Project Structure & Deployment

Topics:

Layered Architecture

Project Structure

Configuration Files

Profiles

Build JAR

Run JAR

Environment Variables

Deployment Basics

Practice Programs:

Organize Spring Boot Project

Create Production Build

Run JAR File

Use Profiles

External Configuration

Deploy Locally

Application Properties Demo

Package Application

Interview Questions:

Layered Architecture?

Why separate Controller, Service and Repository?

How to run Spring Boot JAR?

Profiles?

Packaging?

Deployment Steps?

Configuration Management?

————————————————————

Day 45 – Java Backend Interview Preparation

Topics:

Core Java Revision

Spring Boot Revision

JPA Revision

Spring Security Revision

Microservices Revision

SQL Revision

Git Revision

Resume Preparation

Interview Strategy

Practice Programs:

Java Coding Round

Collections Coding

Java 8 Coding

SQL Queries

REST API Review

JPA CRUD Review

Spring Boot Mini Revision

Mock Interview

Interview Questions:

Test

Day 1 – Java Platform

Topics:

Practice Programs:

Interview Questions:

Day 2 – Variables & Operators

Topics:

Practice Programs:

Interview Questions:

Day 3 – Control Statements & Loops

Topics:

Practice Programs:

Interview Questions:

Day 4 – Methods & Arrays

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