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Stream API
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Course Content

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: Income Tax Calculation

Task

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Implement a program that calculates taxes based on income brackets, applying different tax rates depending on the income level.

  • If the income is over 100,000, the tax rate is 25%.
  • If the income is between 50,000 and 100,000, the tax rate is 15%.
  • If the income is below 50,000, the tax rate is 5%.

  1. Set the appropriate values in if and else if for the income conditions.
  2. Multiply the amount by the appropriate percentage in each case to get the correct tax amount.
  3. In the calculateTaxes method, iterate through the income array using a for-each loop.
  4. Add the tax for each income to the result list by using the taxFunction functional interface passed as a parameter.
  5. Store the result of the calculateTaxes method in the taxes variable.

Solution

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Section 1. Chapter 7
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book
Challenge: Income Tax Calculation

Task

Swipe to start coding

Implement a program that calculates taxes based on income brackets, applying different tax rates depending on the income level.

  • If the income is over 100,000, the tax rate is 25%.
  • If the income is between 50,000 and 100,000, the tax rate is 15%.
  • If the income is below 50,000, the tax rate is 5%.

  1. Set the appropriate values in if and else if for the income conditions.
  2. Multiply the amount by the appropriate percentage in each case to get the correct tax amount.
  3. In the calculateTaxes method, iterate through the income array using a for-each loop.
  4. Add the tax for each income to the result list by using the taxFunction functional interface passed as a parameter.
  5. Store the result of the calculateTaxes method in the taxes variable.

Solution

java

solution

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Section 1. Chapter 7
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