Generate Java code from plain English descriptions. AI creates clean, object-oriented code for Spring Boot, Android apps, and enterprise systems.
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Building robust Java applications requires writing extensive boilerplate code, implementing design patterns, and following enterprise conventions. Our Java code generator uses AI to transform your natural language descriptions into production-ready Java code with proper classes, interfaces, exception handling, and documentation. Whether you need Spring Boot REST APIs, JPA repositories, Android activities, or utility classes, simply describe your requirements and get well-structured code.
Perfect for backend developers building microservices, Android developers creating mobile apps, enterprise engineers implementing business logic, or students learning object-oriented programming. The generated code follows Java best practices including SOLID principles, proper naming conventions, and comprehensive JavaDoc comments.
Generate Spring Boot controllers with @RestController annotations, service layers with business logic, JPA repositories for database access, and configuration classes. Create CRUD endpoints with proper HTTP methods, request/response DTOs, validation annotations, exception handling with @ControllerAdvice, and Swagger documentation. Perfect for building scalable microservices architectures.
Example tasks: "Create Spring Boot REST controller for user management with CRUD operations", "Generate JPA entity with relationships and validation", "Build service layer with transaction management". Includes proper dependency injection and follows Spring best practices.
Create Android Activities with lifecycle methods, Fragments with ViewBinding, RecyclerView adapters for lists, ViewModel classes for MVVM architecture, or Room database entities. Generate code for handling permissions, working with Retrofit for API calls, implementing navigation components, or creating custom views. Includes proper XML layout references and modern Android development patterns.
If migrating from other platforms, check our Java to Kotlin converter to modernize Android code or Java to Swift converter for iOS equivalents.
Generate JPA entities with @Entity annotations, define relationships using @OneToMany/@ManyToMany, create Spring Data JPA repositories with custom queries, implement specifications for dynamic queries, or build DTO projections. Includes proper cascading, fetch types, and transaction management for complex database operations in enterprise applications.
Create implementations of Singleton, Factory, Builder, Strategy, or Observer patterns. Generate abstract classes and interfaces following SOLID principles, implement custom exceptions with proper hierarchies, build utility classes with static methods, or create enums for type-safe constants. Perfect for maintaining clean architecture in large codebases.
Generate Spring Security configuration classes with authentication providers, JWT token filters, user details services, password encoders, or role-based access control. Create security configurations for protecting REST APIs, implementing OAuth2 login, handling CORS policies, or configuring session management for web applications.
Example: "Create Spring Security config with JWT authentication, user roles, and protected endpoints for admin and regular users"
Create repository interfaces extending JpaRepository with custom query methods, implement pagination and sorting, build specifications for dynamic filtering, use @Query annotations for complex JPQL, or configure multiple data sources. Generate code for caching with @Cacheable, auditing with @CreatedDate, or soft deletes with custom repositories.
Example: "Create repository with findByEmailAndActive method, add pagination support, implement specification for filtering by multiple criteria"
Generate Spring AMQP listeners and producers for RabbitMQ, create Kafka consumer and producer configurations, implement message converters, handle dead letter queues, or build event-driven architectures. Includes proper error handling, retry mechanisms, and serialization for distributed systems communication.
Generate code using Java 11+features including streams, Optional, and functional interfaces
Generate code using Java Streams for filtering collections, mapping transformations, reducing to single values, collecting to lists or maps, or grouping data. Create lambda expressions for functional interfaces, use method references for cleaner code, implement custom collectors, or build parallel streams for performance. Perfect for processing large datasets efficiently.
Example prompts: "Filter list of users by active status and map to DTOs", "Group orders by customer and calculate total amount", "Find max value in collection with custom comparator"
Create methods returning Optional to avoid null pointer exceptions, chain operations with map/flatMap, use orElse/orElseGet for default values, or filter optional values. Generate null-safe code for repository queries, service methods, or API responses that properly handle missing data without explicit null checks.
Example: "Create service method that returns Optional user, chain operations to get email, provide default if empty"
Generate asynchronous code with CompletableFuture for non-blocking operations, combine multiple async calls with thenCombine, handle errors with exceptionally, create async service methods with @Async annotation, or build reactive pipelines. Perfect for improving application performance with concurrent API calls or database operations.
Get production-ready code by following these best practices
Mention which framework you're using: "Spring Boot 3.x", "Jakarta EE", "Android SDK 33", or "plain Java 17". This ensures annotations, imports, and patterns match your environment. Different Spring versions have different package names and features.
Good: "Create REST controller"
Better: "Create Spring Boot 3.0 REST controller with @RestController and validation"
Specify package structure and class names for better organization: "package com.example.service", "UserService class", "UserRepository interface". This creates properly structured code that fits into your project hierarchy and follows Java naming conventions.
The generator will use proper PascalCase for classes and camelCase for methods
Ask for patterns when appropriate: "use Builder pattern for User class", "implement Factory for creating different report types", "apply Strategy pattern for payment processing". This creates extensible, maintainable code following enterprise standards.
The generator understands common GoF patterns and SOLID principles
For data access code, specify: "JPA with Hibernate", "Spring Data JPA", "MyBatis", or "JDBC Template". Include table/column names if relevant: "maps to users table with email_address column". This generates appropriate annotations and query methods.
For older code, try our Java to Python converter to migrate legacy systems
Migrating from or to Java? Our converters handle the translation:
Generate unit tests, integration tests, and test utilities
Generate JUnit test classes with @Test annotations, use assertThat with AssertJ for fluent assertions, create @ParameterizedTest for multiple inputs, mock dependencies with Mockito, or build integration tests with @SpringBootTest. Includes proper test lifecycle methods with @BeforeEach/@AfterEach, exception testing, and test organization.
Create mock objects with @Mock annotation, stub method behavior with when().thenReturn(), verify method calls with verify(), use @InjectMocks for dependency injection in tests, or implement custom ArgumentMatchers. Perfect for isolating units under test and controlling external dependencies.
Describe what you want to build in plain English, select Java as your target language, and click "Generate Code". Our AI will create clean, functional Java code based on your description.
Yes! Sign up for a free account and get limited attempts per day with the Trial plan. For unlimited access, upgrade to the Monthly plan ($5/month) or purchase the Lifetime plan ($50) for one-time payment.
You can generate any Java code including functions, classes, algorithms, API integrations, data structures, and complete applications. Just describe your requirements in detail.
Yes, our AI generates clean, well-structured Java code following best practices. However, we recommend reviewing and testing all generated code before production use.
Yes, you can specify coding conventions, naming patterns, and style preferences in your description. The AI will adapt the generated Java code accordingly.
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