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 numbers =
List.of(10, 2, 21, 23, 22, 14, 16, 18, 19, 9, 4, 6, 7);
private static final List words =
List.of("apple", "bread", "tree", "computer", "name", "brain", "arm");
//Use stream to find all numbers that are greater than 10
public static List findAllNumbersGreaterThanTen(List 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 findAllWordsThatContainLetterA(List 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));
}
}