Stream API

Зміст курсу

Stream API

Stream API

1. Fundamentals and Functional Capabilities of Stream API

Architecture Principles What Is a Functional Interface?Predicate: Data Filtering Challenge: Filtering Corporate Email Addresses Function: Data Transformation Challenge: Income Tax Calculation Comparable: Natural Ordering of Data Comparator: Custom Comparison of Data Challenge: Sorting Employees Consumer: Processing Data Supplier: Data Generation Bi-versions of Functional Interfaces Challenge: Filtering Users by Two Criteria BinaryOperator: Combining Two Values

2. Intermediate Operations in Stream API

Transforming Elements with the map() Method Filtering Elements with the filter() Method Challenge: Factory Product Filtering Working with Nested Structures with the flatMap() Method Arranging Items in Order with the sorted() Method Challenge: Selecting the Best Cars on the Production Line Eliminating Duplicates with the distinct() Method Challenge: Factory Quality Control Restricting and Skipping Elements with the limit() and skip() Methods Challenge: Finding the Top 3 Hardest-Working Employees Intermediate Processing with the peek() Method

3. Terminal Operations in the Stream API

collect() Gathering Stream Elements into a Collection Challenge: Build a Custom Collector for Category Counting Collectors Utility Class for Stream API Processing Elements with the forEach() Method Handling Values with the Optional Class Aggregating Elements with the reduce() Method Challenge: Calculating Total Cost with Discounts and Tax Calculating Stream Statistics with count(), max(), and min()Retrieving Stream Summary Metrics with summaryStatistics() Method Retrieving Elements from a Stream with findFirst() and findAny()Challenge: Selecting Random Products Within a Category Checking 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 API Performance in Stream API Exception Handling in Stream API Summary

Challenge: Income Tax Calculation

Завдання

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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%.

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

Рішення

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Секція 1. Розділ 7

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Challenge: Income Tax Calculation

Завдання

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%.

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

Рішення

solution

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 1. Розділ 7

Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів

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