LLD Practice Repository

Index -

Basics -

1. FutureExample - Callables, Future, ExecutorService, etc.
2. AdderSubtractor - Adder Subtractor problem (Thread synchronization) solution
   • using Locks which adds some extra logic to the business logic in Adder or Subtractor
   • synchronized keyword which abstracts away the synchronization logic using monitors or method level synchronization
3. ProducerConsumer - Producer Consumer Problem solution
   • bad : producer consumer threads without synchronization
   • notsogood : Uses Mutex (i.e. Lock) to synchronize the threads, but it's not performant since only one thread allowed to produce or consume at a time.
   • good : Uses Semaphore as a signaling mechanism so that multiple threads can access critical section
   • Ref : Mutex Vs Semaphore
4. LambdaAndStreams - Examples of functional interfaces, lambdas & Java stream basics

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Solid Principles -

• Single Responsibility Principle
• Open-Closed Principle
• Liskov Substitution Principle
• Interface Segregation
• Dependency Inversion

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Design Patterns -

1. creational - Creational Design Patterns
   • Singleton
   • Builder
   • Prototype
   • Simple factory, factory method,
   • Abstract factory
2. structural - Structural Design patterns
   • Decorator
   • Adapter
   • Flyweight
   • Composite
3. behavioral - Behavioral Design Patterns
   • Observer
   • Strategy