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ROADMAP JAVA¤

GIAI ĐOẠN 1: NỀN TẢNG CƠ BẢN (2-3 tháng)¤

Khởi đầu¤

  • Cài đặt JDK (Java Development Kit)
  • JDK vs JRE vs JVM
  • IDE setup: IntelliJ IDEA, Eclipse, NetBeans, VS Code
  • Cấu trúc Java program
  • javac và java commands
  • Classpath và environment variables
  • Hello World program
  • Package structure
  • Compilation và execution process

Cú pháp cơ bản¤

  • Class structure
  • main method
  • Statements và expressions
  • Comments: single-line, multi-line, Javadoc
  • Naming conventions
  • Keywords và reserved words
  • Case sensitivity
  • Code blocks với curly braces

Kiểu dữ liệu¤

  • Primitive types: byte, short, int, long, float, double, char, boolean
  • Wrapper classes: Byte, Short, Integer, Long, Float, Double, Character, Boolean
  • Reference types
  • Type casting: widening và narrowing
  • Autoboxing và unboxing
  • var keyword (Java 10+)
  • Default values
  • Literals: integer, floating-point, character, string, boolean

Biến và Constants¤

  • Variable declaration
  • Variable initialization
  • Local variables
  • Instance variables
  • Class variables (static)
  • final keyword
  • Constants naming convention
  • Variable scope
  • Shadowing

Operators¤

  • Arithmetic operators
  • Relational operators
  • Logical operators: &&, ||, !
  • Bitwise operators: &, |, ^, ~, <<, >>, >>>
  • Assignment operators
  • Ternary operator: ?:
  • instanceof operator
  • Operator precedence
  • Short-circuit evaluation

String Handling¤

  • String class
  • String immutability
  • String literals vs String objects
  • String pool
  • String concatenation: + operator
  • StringBuilder và StringBuffer
  • String methods: charAt, substring, indexOf, replace, split, trim, toLowerCase, toUpperCase
  • String comparison: equals, equalsIgnoreCase, compareTo
  • String formatting: String.format(), printf()
  • Text blocks (Java 15+)

Control Flow¤

If Statements¤

  • if, else if, else
  • Nested if statements
  • Single statement vs block

Switch Statements¤

  • Traditional switch
  • Switch expressions (Java 14+)
  • Switch với multiple cases
  • break statement
  • Default case
  • Switch với String (Java 7+)
  • Switch với enums
  • Yield keyword (Java 13+)

Loops¤

  • for loops
  • Enhanced for loop (for-each)
  • while loops
  • do-while loops
  • break statement
  • continue statement
  • Labeled statements
  • Nested loops

Arrays¤

  • Array declaration và initialization
  • Array length
  • Accessing elements
  • Multi-dimensional arrays
  • Jagged arrays
  • Arrays class: sort, binarySearch, fill, copyOf, equals
  • Array copying
  • Iterating arrays
  • Varargs (variable arguments)

Methods¤

  • Method declaration
  • Method signature
  • Parameters vs arguments
  • Return types
  • void methods
  • Method overloading
  • Pass-by-value
  • Recursion
  • Variable arguments (varargs)
  • main method variations

Input/Output Basics¤

  • System.out.print, println, printf
  • Scanner class
  • Reading console input
  • Formatted output
  • BufferedReader

GIAI ĐOẠN 2: OBJECT-ORIENTED PROGRAMMING (3-4 tháng)¤

Classes và Objects¤

  • Class definition
  • Object creation với new
  • Instance variables
  • Instance methods
  • this keyword
  • Constructors
  • Default constructor
  • Parameterized constructors
  • Constructor overloading
  • Constructor chaining
  • Copy constructor
  • Static members
  • Static methods
  • Static blocks
  • Static imports

Encapsulation¤

  • Access modifiers: public, private, protected, default (package-private)
  • Getters và setters
  • JavaBeans conventions
  • Data hiding
  • Information hiding principle

Inheritance¤

  • extends keyword
  • super keyword
  • Method overriding
  • @Override annotation
  • Constructor inheritance
  • super() call
  • Object class
  • Multilevel inheritance
  • Hierarchical inheritance
  • Single inheritance (no multiple inheritance)
  • final classes
  • final methods
  • Preventing inheritance

Polymorphism¤

  • Compile-time polymorphism (method overloading)
  • Runtime polymorphism (method overriding)
  • Dynamic method dispatch
  • Upcasting và downcasting
  • Reference type vs object type
  • Covariant return types

Abstraction¤

  • Abstract classes
  • abstract keyword
  • Abstract methods
  • Concrete methods trong abstract classes
  • Cannot instantiate abstract classes
  • Abstract class constructors

Interfaces¤

  • Interface definition
  • Implementing interfaces với implements
  • Multiple interface implementation
  • Interface variables (public static final)
  • Interface methods (public abstract)
  • Default methods (Java 8+)
  • Static methods trong interfaces (Java 8+)
  • Private methods trong interfaces (Java 9+)
  • Functional interfaces
  • Marker interfaces
  • extends trong interfaces

Inner Classes¤

  • Member inner classes
  • Static nested classes
  • Local inner classes
  • Anonymous inner classes
  • Lambda expressions as alternative

Packages¤

  • Package declaration
  • Import statements
  • Static imports
  • Package naming conventions
  • CLASSPATH
  • JAR files
  • Access modifiers và packages

Exception Handling¤

  • Exception hierarchy
  • Checked vs unchecked exceptions
  • try-catch-finally
  • Multiple catch blocks
  • try-with-resources (Java 7+)
  • throw statement
  • throws clause
  • Custom exceptions
  • Exception chaining
  • Rethrowing exceptions
  • Suppressed exceptions
  • Best practices

Enums¤

  • Enum declaration
  • Enum constructors
  • Enum methods
  • Enum constants
  • EnumSet và EnumMap
  • values() và valueOf() methods
  • ordinal() method

Annotations¤

  • Built-in annotations: @Override, @Deprecated, @SuppressWarnings, @FunctionalInterface
  • Meta-annotations: @Retention, @Target, @Documented, @Inherited
  • Custom annotations
  • Annotation elements
  • Reflection với annotations
  • Marker annotations
  • Single-value annotations

GIAI ĐOẠN 3: CORE JAVA ADVANCED (4-5 tháng)¤

Generics¤

  • Generic classes
  • Generic methods
  • Type parameters
  • Bounded type parameters: extends
  • Multiple bounds
  • Wildcards: ?, extends, super
  • Upper bounded wildcards
  • Lower bounded wildcards
  • Unbounded wildcards
  • Generic restrictions
  • Type erasure
  • Bridge methods
  • Generic arrays
  • Raw types

Collections Framework¤

Core Interfaces¤

  • Collection interface
  • List interface
  • Set interface
  • Queue interface
  • Deque interface
  • Map interface

List Implementations¤

  • ArrayList
  • LinkedList
  • Vector (legacy)
  • Stack (legacy)
  • CopyOnWriteArrayList

Set Implementations¤

  • HashSet
  • LinkedHashSet
  • TreeSet
  • EnumSet
  • CopyOnWriteArraySet

Queue Implementations¤

  • PriorityQueue
  • ArrayDeque
  • LinkedList (as Queue)

Map Implementations¤

  • HashMap
  • LinkedHashMap
  • TreeMap
  • Hashtable (legacy)
  • EnumMap
  • IdentityHashMap
  • WeakHashMap
  • ConcurrentHashMap

Collections Utility Class¤

  • Sorting
  • Searching
  • Shuffling
  • Reversing
  • Fill
  • Copy
  • Frequency
  • Disjoint
  • Unmodifiable collections
  • Synchronized collections
  • Singleton collections

Comparable và Comparator¤

  • Comparable interface
  • compareTo method
  • Comparator interface
  • compare method
  • Comparator chaining (Java 8+)
  • Comparator factory methods

Lambda Expressions (Java 8+)¤

  • Lambda syntax
  • Functional interfaces
  • Method references
  • Constructor references
  • Lambda scope
  • Effectively final variables
  • Target typing
  • Lambda best practices

Functional Interfaces (Java 8+)¤

  • Predicate
  • Function
  • Consumer
  • Supplier
  • UnaryOperator
  • BinaryOperator
  • BiPredicate, BiFunction, BiConsumer
  • Primitive specializations

Stream API (Java 8+)¤

  • Stream creation
  • Intermediate operations: filter, map, flatMap, distinct, sorted, peek, limit, skip
  • Terminal operations: forEach, collect, reduce, count, anyMatch, allMatch, noneMatch, findFirst, findAny
  • Collectors class
  • Grouping và partitioning
  • Parallel streams
  • Stream performance
  • IntStream, LongStream, DoubleStream
  • Infinite streams
  • Stream pipeline optimization

Optional (Java 8+)¤

  • Creating Optional
  • isPresent và isEmpty
  • get method
  • orElse, orElseGet, orElseThrow
  • ifPresent, ifPresentOrElse
  • map và flatMap
  • filter
  • Optional best practices
  • Avoiding null checks

Date and Time API (Java 8+)¤

  • LocalDate, LocalTime, LocalDateTime
  • ZonedDateTime
  • Instant
  • Duration và Period
  • DateTimeFormatter
  • TemporalAdjusters
  • Clock
  • Legacy Date và Calendar migration

File I/O¤

Traditional I/O (java.io)¤

  • File class
  • InputStream và OutputStream
  • FileInputStream và FileOutputStream
  • BufferedInputStream và BufferedOutputStream
  • Reader và Writer
  • FileReader và FileWriter
  • BufferedReader và BufferedWriter
  • PrintWriter
  • DataInputStream và DataOutputStream
  • ObjectInputStream và ObjectOutputStream
  • RandomAccessFile

NIO.2 (java.nio.file)¤

  • Path interface
  • Paths class
  • Files class
  • File operations: copy, move, delete
  • Walking file trees
  • WatchService
  • File attributes
  • Symbolic links

Serialization¤

  • Serializable interface
  • ObjectOutputStream và ObjectInputStream
  • transient keyword
  • serialVersionUID
  • Custom serialization: writeObject, readObject
  • Externalizable interface
  • Serialization security concerns

Regular Expressions¤

  • Pattern class
  • Matcher class
  • Regex syntax
  • Character classes
  • Quantifiers
  • Capturing groups
  • Lookahead và lookbehind
  • Flags
  • String methods với regex: matches, split, replaceAll

Reflection¤

  • Class object
  • Getting class information
  • Field reflection
  • Method reflection
  • Constructor reflection
  • Creating instances
  • Invoking methods
  • Accessing private members
  • Annotations reflection
  • Array reflection
  • Reflection performance

Multithreading¤

Thread Basics¤

  • Thread class
  • Runnable interface
  • Creating threads
  • Thread lifecycle
  • start vs run
  • Thread priorities
  • Daemon threads
  • Thread groups

Synchronization¤

  • synchronized keyword
  • synchronized methods
  • synchronized blocks
  • Object-level locks
  • Class-level locks
  • Reentrant synchronization
  • volatile keyword
  • wait, notify, notifyAll
  • Producer-consumer problem
  • Deadlock
  • Starvation
  • Livelock

Concurrency Utilities (java.util.concurrent)¤

  • Executor framework
  • ExecutorService
  • ThreadPoolExecutor
  • ScheduledExecutorService
  • Callable và Future
  • CompletableFuture (Java 8+)
  • Locks: ReentrantLock, ReadWriteLock
  • Atomic variables: AtomicInteger, AtomicLong, AtomicReference
  • CountDownLatch
  • CyclicBarrier
  • Semaphore
  • Phaser
  • Exchanger
  • BlockingQueue implementations
  • ConcurrentHashMap
  • CopyOnWriteArrayList
  • Fork/Join framework
  • Parallel streams

Networking¤

  • Socket programming
  • ServerSocket và Socket
  • URL và URLConnection
  • HttpURLConnection
  • InetAddress
  • DatagramSocket (UDP)
  • MulticastSocket

JDBC (Java Database Connectivity)¤

  • JDBC drivers
  • DriverManager
  • Connection interface
  • Statement interface
  • PreparedStatement
  • CallableStatement
  • ResultSet
  • ResultSetMetaData
  • Batch processing
  • Transactions
  • Savepoints
  • Connection pooling

GIAI ĐOẠN 4: ENTERPRISE JAVA (4-6 tháng)¤

Build Tools¤

Maven¤

  • Project structure
  • pom.xml
  • Dependencies
  • Plugins
  • Build lifecycle
  • Maven repositories
  • Multi-module projects
  • Profiles
  • Properties

Gradle¤

  • Groovy DSL vs Kotlin DSL
  • build.gradle
  • Dependencies
  • Tasks
  • Plugins
  • Multi-project builds
  • Gradle wrapper

Spring Framework¤

Spring Core¤

  • Dependency Injection
  • Inversion of Control (IoC)
  • ApplicationContext
  • Bean lifecycle
  • Bean scopes
  • Annotation-based configuration: @Component, @Service, @Repository, @Controller
  • Java-based configuration: @Configuration, @Bean
  • @Autowired, @Qualifier
  • @Value annotation
  • Property sources
  • SpEL (Spring Expression Language)

Spring Boot¤

  • Auto-configuration
  • Spring Initializr
  • application.properties, application.yml
  • Starters
  • Embedded servers: Tomcat, Jetty, Undertow
  • DevTools
  • Actuator
  • Profiles
  • CommandLineRunner
  • @SpringBootApplication

Spring MVC¤

  • DispatcherServlet
  • Controllers: @Controller, @RestController
  • Request mapping: @GetMapping, @PostMapping, etc.
  • @RequestParam, @PathVariable, @RequestBody
  • Model và View
  • ViewResolvers
  • Thymeleaf template engine
  • Form handling
  • Validation: @Valid, BindingResult
  • Exception handling: @ExceptionHandler, @ControllerAdvice
  • Interceptors
  • CORS configuration

Spring Data JPA¤

  • Repository pattern
  • CrudRepository, JpaRepository
  • Query methods
  • @Query annotation
  • Named queries
  • Specifications
  • Pagination và sorting
  • Auditing
  • Entity relationships
  • Cascade types
  • Fetch types

Spring Security¤

  • Authentication
  • Authorization
  • SecurityContext
  • UserDetailsService
  • Password encoding
  • Method security: @PreAuthorize, @PostAuthorize
  • CSRF protection
  • Session management
  • Remember-me
  • OAuth2
  • JWT authentication
  • Spring Security filters

Spring REST¤

  • @RestController
  • ResponseEntity
  • HTTP status codes
  • Content negotiation
  • RestTemplate (deprecated)
  • WebClient (reactive)
  • Exception handling
  • HATEOAS
  • API versioning
  • Swagger/OpenAPI integration

Spring AOP¤

  • Aspect-Oriented Programming concepts
  • Cross-cutting concerns
  • Aspects, Advice, Pointcuts, Join points
  • @Aspect annotation
  • @Before, @After, @AfterReturning, @AfterThrowing, @Around
  • Pointcut expressions
  • AOP proxies

Spring Transactions¤

  • @Transactional annotation
  • Transaction propagation
  • Transaction isolation levels
  • Rollback rules
  • Programmatic transactions

Spring Batch¤

  • Job, Step, Tasklet
  • ItemReader, ItemProcessor, ItemWriter
  • Chunk-oriented processing
  • Job parameters
  • Job repository
  • Scheduling jobs

Spring Cloud¤

  • Microservices architecture
  • Service discovery: Eureka
  • API Gateway: Spring Cloud Gateway
  • Config Server
  • Circuit breaker: Resilience4j
  • Distributed tracing: Sleuth, Zipkin
  • Load balancing: Ribbon (deprecated), Spring Cloud LoadBalancer
  • Feign client

Hibernate (ORM)¤

  • SessionFactory và Session
  • Configuration
  • Entity mapping: @Entity, @Table, @Column
  • Primary keys: @Id, @GeneratedValue
  • Relationships: @OneToOne, @OneToMany, @ManyToOne, @ManyToMany
  • Cascade types
  • Fetch types: LAZY, EAGER
  • HQL (Hibernate Query Language)
  • Criteria API
  • Named queries
  • Caching: First-level, Second-level, Query cache
  • Hibernate vs JPA

RESTful Web Services¤

  • REST principles
  • HTTP methods
  • Status codes
  • Resource design
  • URI design
  • JAX-RS (Jersey)
  • Spring REST
  • Content negotiation
  • HATEOAS
  • Pagination
  • Filtering và sorting
  • API versioning strategies
  • Richardson Maturity Model

Microservices¤

  • Microservices principles
  • Service decomposition
  • Inter-service communication
  • API Gateway pattern
  • Service discovery
  • Circuit breaker pattern
  • Event-driven architecture
  • SAGA pattern
  • Database per service
  • Distributed transactions
  • Eventual consistency

Message Queues¤

JMS (Java Message Service)¤

  • Point-to-Point model
  • Publish-Subscribe model
  • Queue và Topic
  • MessageProducer và MessageConsumer
  • Message types

Apache Kafka¤

  • Producers
  • Consumers
  • Topics và partitions
  • Consumer groups
  • Kafka Streams
  • Spring Kafka

RabbitMQ¤

  • Exchanges: Direct, Fanout, Topic, Headers
  • Queues
  • Bindings
  • Spring AMQP

Testing¤

JUnit¤

  • JUnit 4 vs JUnit 5
  • Test methods: @Test
  • Lifecycle: @BeforeEach, @AfterEach, @BeforeAll, @AfterAll
  • Assertions
  • Parameterized tests
  • Test suites
  • Assumptions
  • @Disabled
  • Test execution order

Mockito¤

  • Mock objects
  • @Mock, @InjectMocks
  • when-thenReturn
  • verify
  • ArgumentCaptor
  • ArgumentMatchers
  • Spy objects
  • @MockBean (Spring Boot)

AssertJ¤

  • Fluent assertions
  • Readable test code

Integration Testing¤

  • @SpringBootTest
  • TestRestTemplate
  • MockMvc
  • @DataJpaTest
  • @WebMvcTest
  • Test containers
  • H2 in-memory database

TDD và BDD¤

  • Test-Driven Development
  • Behavior-Driven Development
  • Cucumber
  • Gherkin syntax

Logging¤

  • java.util.logging (JUL)
  • Log4j 2
  • Logback
  • SLF4J (Simple Logging Facade)
  • Log levels
  • Appenders
  • Layouts
  • Configuration files
  • MDC (Mapped Diagnostic Context)
  • Structured logging

API Documentation¤

  • Javadoc
  • Swagger/OpenAPI
  • SpringDoc OpenAPI
  • API specifications
  • Interactive documentation

GIAI ĐOẠN 5: ADVANCED TOPICS (4-6 tháng)¤

Design Patterns¤

  • Creational: Singleton, Factory, Abstract Factory, Builder, Prototype
  • Structural: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy
  • Behavioral: Chain of Responsibility, Command, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor, Interpreter
  • J2EE patterns: MVC, DAO, DTO, Service Locator, Front Controller
  • Dependency Injection
  • Repository pattern

Performance Optimization¤

  • JVM tuning
  • Heap size configuration: -Xms, -Xmx
  • Garbage collection tuning
  • GC algorithms: Serial, Parallel, CMS, G1, ZGC, Shenandoah
  • GC logs analysis
  • Thread dump analysis
  • Heap dump analysis
  • Profiling tools: JProfiler, YourKit, VisualVM
  • Java Flight Recorder
  • Benchmarking: JMH (Java Microbenchmark Harness)
  • Memory leak detection
  • Performance monitoring

Memory Management¤

  • Memory areas: Heap, Stack, Method Area, PC Register
  • Garbage collection
  • GC generations: Young, Old, Permanent/Metaspace
  • Memory leaks
  • WeakReference, SoftReference, PhantomReference
  • finalize method (deprecated)
  • Cleaner API (Java 9+)

JVM Internals¤

  • Class loading mechanism
  • ClassLoader hierarchy
  • Bytecode
  • JIT (Just-In-Time) compilation
  • HotSpot VM
  • Ahead-of-Time compilation
  • Native methods
  • JNI (Java Native Interface)

Reactive Programming¤

  • Reactive Streams specification
  • Project Reactor
  • Mono và Flux
  • Operators
  • Schedulers
  • Backpressure
  • Spring WebFlux
  • Reactive repositories
  • Server-Sent Events (SSE)
  • WebSocket với reactive

Security¤

  • OWASP Top 10
  • SQL injection prevention
  • XSS prevention
  • CSRF protection
  • Authentication vs Authorization
  • JWT (JSON Web Tokens)
  • OAuth 2.0
  • OpenID Connect
  • HTTPS/TLS
  • Encryption: AES, RSA
  • Hashing: SHA-256, bcrypt
  • Java Cryptography Architecture (JCA)
  • KeyStore và TrustStore
  • Certificate handling

Docker và Containerization¤

  • Docker basics
  • Dockerfile cho Java applications
  • Multi-stage builds
  • Docker Compose
  • Container orchestration basics
  • Java trong containers
  • Memory và CPU limits
  • Health checks

Kubernetes¤

  • Pods, Deployments, Services
  • ConfigMaps và Secrets
  • Ingress
  • Persistent Volumes
  • Helm charts
  • Java applications trong K8s
  • Health probes: liveness, readiness
  • Resource management

CI/CD¤

  • Jenkins
  • GitLab CI
  • GitHub Actions
  • Azure DevOps
  • Build automation
  • Test automation
  • Deployment automation
  • Blue-green deployment
  • Canary deployment
  • Feature toggles

Monitoring và Observability¤

  • Application metrics
  • Micrometer
  • Prometheus integration
  • Grafana dashboards
  • Distributed tracing
  • Jaeger
  • Zipkin
  • ELK Stack: Elasticsearch, Logstash, Kibana
  • Application Performance Monitoring (APM)
  • New Relic, Dynatrace, AppDynamics

Cloud Platforms¤

AWS¤

  • EC2
  • S3
  • RDS
  • Lambda
  • Elastic Beanstalk
  • API Gateway
  • CloudWatch
  • AWS SDK for Java

Azure¤

  • Azure App Service
  • Azure Functions
  • Azure SQL Database
  • Azure Storage
  • Azure Service Bus
  • Application Insights

Google Cloud Platform¤

  • Compute Engine
  • Cloud Storage
  • Cloud SQL
  • Cloud Functions
  • App Engine
  • Cloud Pub/Sub

GraphQL¤

  • GraphQL concepts
  • Schema definition
  • Queries và Mutations
  • Resolvers
  • GraphQL Java
  • Spring Boot với GraphQL
  • DataLoader pattern
  • Subscriptions

gRPC¤

  • Protocol Buffers
  • Service definitions
  • Unary RPCs
  • Server streaming
  • Client streaming
  • Bidirectional streaming
  • gRPC Java
  • Interceptors

WebSockets¤

  • WebSocket protocol
  • javax.websocket API
  • Spring WebSocket
  • STOMP protocol
  • SockJS fallback
  • Message brokers

Apache Projects¤

  • Apache Commons: Lang, Collections, IO
  • Apache HttpClient
  • Apache POI (Excel, Word)
  • Apache Camel (integration)
  • Apache Spark (big data)

GIAI ĐOẠN 6: CHUYÊN MÔN HÓA¤

Enterprise JavaBeans (EJB) - Legacy¤

  • Session Beans: Stateless, Stateful
  • Message-Driven Beans
  • Entity Beans (deprecated)
  • EJB lifecycle
  • Dependency injection trong EJB
  • Transaction management

JavaServer Faces (JSF)¤

  • JSF lifecycle
  • Managed beans
  • Navigation
  • UI components
  • Validators
  • Converters
  • Facelets
  • Ajax support

Java Persistence API (JPA)¤

  • Entity Manager
  • Persistence Context
  • JPQL (Java Persistence Query Language)
  • Criteria API
  • Entity lifecycle
  • Relationships
  • Caching strategies
  • Locking: Optimistic, Pessimistic

Big Data¤

  • Apache Hadoop
  • HDFS
  • MapReduce
  • Apache Spark
  • Spark RDDs
  • Spark DataFrames
  • Spark SQL
  • Spark Streaming
  • Apache Kafka Streams
  • Apache Flink

Machine Learning¤

  • Deeplearning4j
  • Weka
  • Apache Mahout
  • TensorFlow Java API
  • ONNX Runtime
  • Model serving

Android Development¤

  • Android SDK
  • Activities và Fragments
  • Layouts: XML
  • Intents
  • Services
  • Broadcast Receivers
  • Content Providers
  • SQLite
  • Retrofit
  • Room database
  • Kotlin interoperability

Desktop Applications¤

  • JavaFX
  • Scene và Stage
  • FXML
  • CSS styling
  • Controls
  • Layouts
  • Event handling
  • Properties và binding
  • Concurrency trong JavaFX
  • Charts và graphs

Game Development¤

  • LibGDX framework
  • jMonkeyEngine
  • LWJGL (Lightweight Java Game Library)

Scientific Computing¤

  • Apache Commons Math
  • EJML (Efficient Java Matrix Library)
  • JFreeChart
  • JMathPlot

GIAI ĐOẠN 7: MASTERY (liên tục)¤

Java Version Features¤

  • Java 8: Lambdas, Streams, Optional, Date/Time API
  • Java 9: Modules (JPMS), JShell, Flow API
  • Java 10: Local variable type inference (var)
  • Java 11: HTTP Client, String methods, Files methods
  • Java 12: Switch expressions (preview)
  • Java 13: Text blocks (preview)
  • Java 14: Records (preview), Pattern matching
  • Java 15: Sealed classes (preview), Text blocks
  • Java 16: Records, Pattern matching, Vector API
  • Java 17 LTS: Sealed classes, Pattern matching enhancements
  • Java 18: Simple Web Server, UTF-8 by default
  • Java 19: Virtual Threads (preview), Pattern matching
  • Java 20: Scoped Values (preview), Record patterns
  • Java 21 LTS: Virtual Threads, Sequenced Collections, Pattern matching

Project Loom (Virtual Threads)¤

  • Lightweight threads
  • Structured concurrency
  • Scoped values
  • Virtual thread creation
  • Performance benefits
  • Migration strategies

Project Panama¤

  • Foreign Function & Memory API
  • Vector API
  • Native interoperability
  • Performance improvements

Project Valhalla¤

  • Value types
  • Generic specialization
  • Performance optimizations

Java Module System (JPMS)¤

  • module-info.java
  • requires và exports
  • Module types
  • Modular JDK
  • Automatic modules
  • Unnamed modules
  • Module path vs classpath
  • jlink tool
  • Custom runtime images

Best Practices¤

  • Clean Code principles
  • SOLID principles
  • DRY, KISS, YAGNI
  • Code smells
  • Refactoring techniques
  • Effective Java (Joshua Bloch)
  • Coding standards
  • Code reviews
  • Naming conventions
  • Comments best practices

Architecture¤

  • Monolithic architecture
  • Microservices architecture
  • Serverless architecture
  • Event-driven architecture
  • Hexagonal architecture (Ports & Adapters)
  • Clean Architecture
  • Domain-Driven Design (DDD)
  • CQRS pattern
  • Event Sourcing

Open Source Contribution¤

  • Finding projects
  • Understanding codebases
  • Making pull requests
  • Issue tracking
  • Code review process
  • Apache Software Foundation projects
  • Eclipse Foundation projects
  • Spring ecosystem

Certifications¤

  • Oracle Certified Associate (OCA)
  • Oracle Certified Professional (OCP)
  • Oracle Certified Master (OCM)
  • Spring Professional Certification
  • AWS Certified Developer

Staying Current¤

  • Oracle Java blog
  • Baeldung
  • DZone Java Zone
  • InfoQ Java
  • JavaWorld
  • Java Magazine
  • JEPs (JDK Enhancement Proposals)
  • OpenJDK mailing lists
  • Java conferences: JavaOne, Devoxx, J-Fall
  • YouTube channels
  • Podcasts: Java Pub House, Inside Java

Books to Read¤

  • Effective Java - Joshua Bloch
  • Java Concurrency in Practice - Brian Goetz
  • Head First Design Patterns
  • Clean Code - Robert C. Martin
  • Spring in Action
  • Java Performance: The Definitive Guide
  • Thinking in Java - Bruce Eckel
  • Core Java Volume I & II - Cay Horstmann

Community Involvement¤

  • Stack Overflow
  • Reddit r/java, r/javahelp
  • Java User Groups (JUGs)
  • GitHub Java projects
  • Twitter Java community
  • LinkedIn Java groups
  • Discord servers
  • Meetups

Interview Preparation¤

  • Data structures và algorithms
  • System design
  • LeetCode, HackerRank
  • Java-specific questions
  • Spring interview questions
  • Multithreading questions
  • Design pattern implementations
  • Code review scenarios

LỘ TRÌNH HỌC TẬP ĐỀ XUẤT¤

Tháng 1-3: Giai đoạn 1 - Cú pháp cơ bản, OOP fundamentals

Tháng 4-7: Giai đoạn 2 - OOP advanced, exceptions, collections

Tháng 8-12: Giai đoạn 3 - Generics, Streams, multithreading, JDBC

Tháng 13-18: Giai đoạn 4 - Spring Framework, Hibernate, microservices

Tháng 19-24: Giai đoạn 5 - Design patterns, performance, reactive

Tháng 25+: Giai đoạn 6-7 - Chuyên môn hóa theo career path

TIPS ĐỂ MASTER JAVA¤

  • Code mỗi ngày consistently
  • Đọc official Java documentation
  • Practice data structures và algorithms
  • Build real-world projects
  • Contribute to open source
  • Read source code của popular libraries
  • Master Collections Framework thoroughly
  • Understand multithreading deeply
  • Learn Spring ecosystem well
  • Practice design patterns trong context
  • Write clean, readable code
  • Follow Java coding conventions
  • Use IDE effectively (shortcuts, refactoring)
  • Debug code systematically
  • Write unit tests
  • Read Effective Java book
  • Stay updated với Java releases
  • Join Java communities
  • Attend Java conferences
  • Watch conference talks
  • Follow Java experts on Twitter
  • Solve coding challenges
  • Learn from code reviews
  • Teach others what you learn
  • Build a portfolio
  • Understand JVM internals
  • Profile và optimize code
  • Keep learning new frameworks
  • Network với Java developers
  • Be patient - mastery takes time

Chúc bạn thành công trên con đường master Java!