Kursusindhold

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: Selecting the Best Cars on the Production Line

Opgave

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At the factory, you need to process a list of cars, filter them based on mileage, sort them according to specific criteria, and display the results.

Each car is represented by the Car class, which contains an id as a unique identifier, a model specifying the car’s name, a year indicating when it was manufactured, and a mileage field representing the total distance it has traveled.

Filter the cars, keeping only those with a mileage of 30,000 miles or less using the filter() method.
Sort the cars by year in ascending order using comparingInt() method.
Once the cars are sorted by year, reverse the order to have the newest cars first using reversed() method.
If two cars have the same year, sort them by mileage in ascending order using thenComparing() method.
Convert each car object to a string representation, using the toString() method.
Print the final list to the console, using a method reference to println().

Løsning

solution

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Sektion 2. Kapitel 6

Challenge: Selecting the Best Cars on the Production Line

Opgave

Swipe to start coding

At the factory, you need to process a list of cars, filter them based on mileage, sort them according to specific criteria, and display the results.

Filter the cars, keeping only those with a mileage of 30,000 miles or less using the filter() method.
Sort the cars by year in ascending order using comparingInt() method.
Once the cars are sorted by year, reverse the order to have the newest cars first using reversed() method.
If two cars have the same year, sort them by mileage in ascending order using thenComparing() method.
Convert each car object to a string representation, using the toString() method.
Print the final list to the console, using a method reference to println().

Løsning

solution

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 6

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder