Topic Note: Java Streams API

Course: Java Programming Masterclass — Tim Buchalka (Udemy)
Status: To Do

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Learning Objectives

• Understand stream pipeline architecture (source → intermediate → terminal)
• Master intermediate operations (filter, map, flatMap, sorted, distinct, peek)
• Master terminal operations (collect, reduce, forEach, count, findFirst)
• Use Collectors effectively (toList, groupingBy, partitioningBy)
• Use Optional to handle nulls safely
• Know when to use parallel streams

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Key Concepts from the Course

Creating Streams

// From collection
collection.stream()

// From array
Arrays.stream(array)

// From values
Stream.of(1, 2, 3)

// Generate/iterate
Stream.generate(() -> "element")
Stream.iterate(0, n -> n + 1)

Stream Pipeline Pattern

collection.stream()
    .filter(/* predicate */)
    .map(/* function */)
    .sorted(/* comparator */)
    .collect(Collectors.toList());

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