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import java.util.List;

import java.util.stream.Collectors;

A demo for the Java Streams API

Includes examples with lists of numbers and words

public class JavaStreams {

private static final List<Integer> numbers =

List.of(10, 2, 21, 23, 22, 14, 16, 18, 19, 9, 4, 6, 7);

private static final List<String> words =

List.of("apple", "bread", "tree", "computer", "name", "brain", "arm");

//Use stream to find all numbers that are greater than 10

public static List<Integer> findAllNumbersGreaterThanTen(List<Integer> numbers){

return numbers.stream()

.filter(number -> number > 10)

.sorted()

.collect(Collectors.toList());

}

//Use stream to find all numbers that contain the letter a

public static List<String> findAllWordsThatContainLetterA(List<String> words){

return words.stream()

.filter(word -> word.contains("a"))

.collect(Collectors.toList());

}

//print out the origin lists, and then the changed lists

public static void main(String[] args) {

System.out.println("The unsorted array is: "

+ numbers);

System.out.println("The sorted array is: "

+ numbers.stream().sorted().toList());

System.out.println("All numbers in the list greater than 10: "

+ findAllNumbersGreaterThanTen(numbers));

System.out.println();

System.out.println("A list of words: " + words);

System.out.println("All words in the list that contain the letter A: "

+ findAllWordsThatContainLetterA(words));

}