java_upgrade/src/main/java/FinderDemo.java at master · gtitar/java_upgrade · GitHub

19 lines (17 loc) · 630 Bytes

import java.util.Arrays;

import java.util.HashSet;

import java.util.List;

import java.util.Optional;

public class FinderDemo {

public static void main(String[] args) {

List<String> strings = Arrays.asList("this", "is", "a", "list", "of", "strings");

HashSet<String> stringSet = new HashSet<>(strings);

Optional<String> first = strings.stream()

.filter(s -> {

System.out.println(Thread.currentThread().getName() + " with " + s);

return s.length() == 2;

})

.findFirst();

System.out.println(first);

}

Expand file tree