Echoes of Tomorrow

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[Intro]

डीजे! बीट को थोड़ा हाई कर!

लैपटॉप खोल, Ide चला!

Java का compiler सामने आया,

आज coding का तूफ़ान छाया!

Jvm ready? Jdk ready?

Java के दीवानों, everybody get ready!

तीन, दो, एक...

Code!

[Chorus]

Java का जलवा, coding का नशा,

Class से Object, दुनिया मेरी फ़िदा!

Jvm बोले, "चल मेरे साथ,"

Bytecode लेकर, हर platform के पार!

Java का जलवा, दिल में है fire,

Clean code लिखना, मेरा desire!

Bug जो आए, कर दूँ मैं solve,

Developer हूँ भाई, that's my role!

सबसे पहले मैं Class बनाऊँ,

Main method से game चलाऊँ!

Public static void main,

Entry point है इसका नाम!

System.out.println से,

Output screen पर आए!

Variable में data store,

Datatype बताए किस type का load!

Int में number, String में नाम,

Boolean में true-false का काम!

Char में character, Double में decimal,

Java का syntax बड़ा special!

Constructor object को initialize करे,

New keyword memory allocate करे!

Reference पकड़े object की जान,

Heap memory में उसका मकान!

[Verse 2]

Oop के चार pillars, याद कर भाई,

Interview में पूछे तो answer दे fly!

Encapsulation, data को hide कराए,

Private fields, getter-setter लाए!

Inheritance से parent का feature मिले,

Child class नए features भी लिखे!

Polymorphism का double कमाल,

Overloading compile-time, overriding runtime का हाल!

Abstraction बोले, details छुपा,

Interface या abstract class से design बना!

Interface contract, implementation अलग,

Loose coupling का concept समझ!

IS-A relation inheritance का नाम,

HAS-A relation composition का काम!

Oop से maintainable application,

Clean design, सही implementation!

Array fixed size, index से access,

Collection Framework देता flexibility खास!

List में order, duplicates allowed,

ArrayList dynamic, performance proud!

LinkedList nodes, links की chain,

Insert-delete use case, समझ ले game!

Set में unique, duplicate goodbye,

HashSet hashing से entry try!

TreeSet sorted, Comparator का rule,

Natural order भी sorting tool!

Map में key-value, unique key का scene,

HashMap lookup, average constant-time!

LinkedHashMap insertion order retain,

TreeMap sorted keys, sorting का shine!

Queue Fifo, first in first out,

Deque दोनों ends, no doubt!

PriorityQueue priority पे serve,

Comparable natural, Comparator custom curve!

Java का जलवा! (Hey!)

Collections का power! (Hey!)

List, Set, Map,

Code करे super!

Java का जलवा! (Hey!)

Streams का flow! (Hey!)

Filter, Map, Collect,

Let the data go!

[Verse 5]

Lambda expression, छोटा syntax,

Functional Interface, एक abstract method!

Predicate test करे, true या false,

Function transform, result का source!

Consumer accept, action perform,

Supplier value दे, no input concern!

Stream में Filter, condition apply,

Map से transform, values fly!

Sorted order, Distinct unique,

Reduce से aggregate, result produce!

Collectors.toList, data collect,

Optional से absence को detect!

Parallel Stream, tasks divide,

Order और overhead, use with insight!

For loop से Stream, readable code,

Functional style, modern mode!

Thread बना, task को run करा,

Runnable से behavior define करा!

Start method, new thread create,

Run directly? Same thread, that's the difference right!

ExecutorService, thread pool,

Reuse workers, concurrency tool!

Callable result, Future wait,

Async tasks, coordinate!

Synchronized lock, shared data guard,

Atomic classes, Cas का card!

Volatile visibility, not atomicity,

Memory model की responsibility!

Deadlock आए, threads freeze,

Lock order से avoid this disease!

CompletableFuture, async chain,

Exception handle, compose again!

ConcurrentHashMap, concurrent access,

Thread-safe design, avoid excess stress!

[Verse 7]

Jdk में tools, Compiler का नाम,

Jre runtime, Jvm उसका काम!

Source code से Bytecode बने,

Class Loader classes को लाए!

Bytecode Verifier safety check,

Execution Engine runs the next!

Interpreter code execute करे,

Jit hot code optimize करे!

Heap memory, objects का घर,

Stack पे frames, method का सफर!

Metaspace class metadata store,

Garbage Collector memory restore!

Young Generation, Old Generation,

Gc algorithms handle collection!

Platform independent, Bytecode का game,

Jvm implementation, OS-specific lane!

Spring Boot आया, setup हुआ light,

Auto-configuration, project ready right!

IoC Container, Beans का control,

Dependency Injection, loose coupling goal!

Controller request, Service logic,

Repository data, architecture classic!

Rest Api, Http का flow,

Get, Post, Put, Delete — let it go!

Dto से data transfer,

Validation before business layer!

Spring Security, Authentication,

Authorization checks, access protection!

Jwt Token, Claims का plan,

Signature validate, trusted token scan!

Microservices, separate deploy,

Service boundaries, scale the way!

Api Gateway, single entry point,

Load Balancer routes, traffic right!

Service Discovery, instances find,

Circuit Breaker, failures confined!

Kafka Topic, Producer sends,

Consumer reads, event flow bends!

Partition, Offset, Consumer Group,

Scale consumers, process the queue!

Docker Image, Container run,

CI/CD pipeline, deployment done!

Logs, Metrics, Tracing flow,

Observability helps us know!