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4.2 Standard Interfaces: Predicate, Function, Consumer & Supplier
Topic Summary
Master the four pillars of java.util.function, primitive specializations, and method references (::).
What You Will Learn
• Differentiate `Predicate<T>`, `Function<T, R>`, `Consumer<T>`, and `Supplier<T>`.
• Use method references (`String::toUpperCase`, `System.out::println`).
• Chain functions with `.andThen()` and predicates with `.and()`.
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