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Stream API
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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
Real-World Examples of Using Stream APIPerformance in Stream APIException Handling in Stream APISummary

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Challenge: Filtering Corporate Email Addresses

Task

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You have a list of employee email addresses, and you need to keep only the corporate emails (those ending with @company.com).

  1. Implement a Predicate to filter corporate emails that end with @company.com.
  2. Pass the correct parameters to the filterEmails method.
  3. In the filterEmails method, iterate through all email addresses using a for-each loop.
  4. Apply the Predicate in the if condition.
  5. Add the matching emails to the new list result.

Solution

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SectionΒ 1. ChapterΒ 5
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book
Challenge: Filtering Corporate Email Addresses

Task

Swipe to start coding

You have a list of employee email addresses, and you need to keep only the corporate emails (those ending with @company.com).

  1. Implement a Predicate to filter corporate emails that end with @company.com.
  2. Pass the correct parameters to the filterEmails method.
  3. In the filterEmails method, iterate through all email addresses using a for-each loop.
  4. Apply the Predicate in the if condition.
  5. Add the matching emails to the new list result.

Solution

java

solution

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 1. ChapterΒ 5
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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