• 🧠 4.1: Using Variables in Lambdas
• 🧠 4.2: Working with Built-in Functional Interfaces
• 🧠 4.3: Returning an Optional
• 🧠 4.4: Using streams
• 🧠 4.5: Working with Primitives
• 🧠 4.6: Working with Advanced Pipeline Concepts
• 🧠 4.7 Summary
• 📝 Revision Notes
• ✅ Review Questions

This chapter will introduce more functional interfaces and the Optional class.

• Generics and Collections:

  • Collections Steams and Filters
  • Iterate using forEach methods on Streams and List
  • Describe Stream interface and Stream pipeline
  • Use method references with Streams

• Lambda Built-In Functional Interfaces

  • Use the built-in interfaces in java.util.function such as Predicate, Consumer, Function and Supplier
  • Develop code which uses primitive versions of functional interfaces
  • Develop code which uses binary version of functional interfaces.
  • Develop code that uses the UnaryOperator interface

• Java Stream API:

  • Develop code to extract data from an object using peek() and map() methods including the primitive versions of map()
  • Search for data by using search methods in Streams such as findFirst, findAny, anyMatch, allMatch, and noneMatch
  • Develop code which uses the Optional class
  • Develop code which uses Stream data and calculation methods
  • Sort a collection using Stream API
  • Save results to a collection using the collect method
  • Use merge() and flat() methods of Stream API