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How to process large datasets with Java streams and lambdas

Java Streams for e-commerce analytics: filter, map, collect, Collectors.groupingBy, sorted with Comparators, flatMap, reduce, and method references....

Eliminating NullPointerExceptions with Java's Optional

Eliminate NullPointerExceptions in Java using Optional: ofNullable, map, flatMap, filter, orElse, orElseThrow, and ifPresent — three rules of correct ...

Writing Type-Safe Libraries with Java Generics

Java generics for a type-safe analytics pipeline: type parameters, bounded types, multiple bounds, wildcards with PECS, and generic utility methods....

Modeling Immutable Data with Java Records and Sealed Classes

Java Records and Sealed Classes for event sourcing: compact constructors, sealed interfaces with permits, pattern matching in switch expressions....