SilverioMG

package net.atopecode.optionals;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

SilverioMG

package net.atopecode.optionals.model;

public class State {
	
	private String name;
	
	private Integer code;
	
	public State(String name, Integer code) {
		this.name = name;

SilverioMG

package net.atopecode.optionals.model;

public class Address {
	
	private String street;
	
	private Integer number;
	
	private State state;
	

SilverioMG

package net.atopecode.optionals.model;

public class Person {
	
	private String name;
	
	private String email;
	
	private Address address;
	

SilverioMG

public class Person {
    private String name;
    
    public Person(){
        name = null;
    }
    
    String getName(){
        return name;
    }

SilverioMG

public class Person {
    private String name;
    
    //Mala práctica.
    public Person(Optional<String> name){
        this.name = name.orElse("");
    }
}

SilverioMG

public class Person {
    private Optional<String> name; //Mala práctica.
    
    public Person(){
        this.name = Optional.empty();
    }
}

SilverioMG

public class PersonService {
    
    private PersonRepository personRepository;
    
    @Autowired
    public(PersonRepository personRepository){
        this.personRepository = personRepository;
    }
    
    //Se devuelve un 'Optional' indicando que puede que no exista 

SilverioMG

	@Test
	public void allMatch_anyMatch_noneMatch() {
	    List<Integer> intList = Arrays.asList(2, 4, 5, 6, 8);
	    
	    boolean allEven = intList.stream().allMatch(i -> i % 2 == 0);
	    boolean oneEven = intList.stream().anyMatch(i -> i % 2 == 0);
	    boolean noneMultipleOfThree = intList.stream().noneMatch(i -> i % 3 == 0);
	    
	    assertEquals(allEven, false);
	    assertEquals(oneEven, true);

SilverioMG

	@Test
	public void distinct() {
		bookList.add(new Book(bookList.get(0).getTitle(), "", 0d));
		List<String> distinctTitles = bookList.stream()
				.map(book -> book.getTitle())
				.distinct()
				.peek(System.out::println)
				.collect(Collectors.toList());
		
		assertEquals(distinctTitles.size(), 3);