java_upgrade/src/main/java/lambdas/UsePerson.java at master · sairam-github/java_upgrade · GitHub

29 lines (21 loc) · 882 Bytes

package lambdas;

import java.util.Arrays;

import java.util.List;

import java.util.stream.Collectors;

public class UsePerson {

@SuppressWarnings({"UnusedAssignment", "Convert2MethodRef"})

public static void main(String[] args) {

List<String> names = Arrays.asList("John", "Paul", "George", "Ringo");

List<Person> people = names.stream() // Stream<String>

.map(name -> new Person(name)) // Stream<Person>

.collect(Collectors.toList()); // Converts Stream<Person> to List<Person>

people = names.stream()

.map(Person::new)

.collect(Collectors.toList());

System.out.println(people);

Person[] peopleArray = names.stream()

.map(Person::new)

.toArray(Person[]::new);

System.out.println(Arrays.toString(peopleArray));

}

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