Kursusindhold
Stream API
Stream API
1. Fundamentals and Functional Capabilities of Stream API
ArchitecturePrinciplesWhat Is a Functional Interface?Predicate: Data FilteringChallenge: Filtering Corporate Email AddressesFunction: Data TransformationChallenge: Income Tax CalculationComparable: Natural Ordering of DataComparator: Custom Comparison of DataChallenge: Sorting Employees Consumer: Processing Data Supplier: Data GenerationBi-versions of Functional InterfacesChallenge: Filtering Users by Two CriteriaBinaryOperator: Combining Two Values
2. Intermediate Operations in Stream API
Transforming Elements with the map() MethodFiltering Elements with the filter() MethodChallenge: Factory Product FilteringWorking with Nested Structures with the flatMap() MethodArranging Items in Order with the sorted() MethodChallenge: Selecting the Best Cars on the Production LineEliminating Duplicates with the distinct() MethodChallenge: Factory Quality ControlRestricting and Skipping Elements with the limit() and skip() MethodsChallenge: Finding the Top 3 Hardest-Working EmployeesIntermediate Processing with the peek() Method
3. Terminal Operations in the Stream API
collect() Gathering Stream Elements into a CollectionChallenge: Build a Custom Collector for Category CountingCollectors Utility Class for Stream APIProcessing Elements with the forEach() MethodHandling Values with the Optional ClassAggregating Elements with the reduce() MethodChallenge: Calculating Total Cost with Discounts and TaxCalculating Stream Statistics with count(), max(), and min()Retrieving Stream Summary Metrics with summaryStatistics() MethodRetrieving Elements from a Stream with findFirst() and findAny()Challenge: Selecting Random Products Within a CategoryChecking Stream Elements Against a Condition with allMatch()Challenge: Ensuring Fast Delivery for Expensive Products
4. Practical Applications of Stream API
Challenge: Factory Product Filtering
Opgave
Swipe to start coding
The factory produces products represented by Product objects, which have the fields id, weight, and quality.
- Filter the products to keep only those with a
qualityof"GOOD"and aweightgreater than 10.0. - Extract only the
idof the filtered products using a method reference. - Once the result is collected into a list, print the
idof the selected products using a method reference toprintln.
Løsning
solution
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Sektion 2. Kapitel 3
Challenge: Factory Product Filtering
Opgave
Swipe to start coding
The factory produces products represented by Product objects, which have the fields id, weight, and quality.
- Filter the products to keep only those with a
qualityof"GOOD"and aweightgreater than 10.0. - Extract only the
idof the filtered products using a method reference. - Once the result is collected into a list, print the
idof the selected products using a method reference toprintln.
Løsning
solution
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående mulighederVar alt klart?
Tak for dine kommentarer!
Sektion 2. Kapitel 3
Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder