7.4 e 7.5 Collectors
Podemos usar o método collect para resgatar esses elementos do nosso
Stream para uma List. Porém, repare sua assinatura
⛶R collect(Supplier supplier,
BiConsumer accumulator,
BiConsumer combiner...
7.6 Liste apenas os pontos de todos os usuários com o map
Problema na abordagem tradicional:
Criar uma lista manualmente e adicionar elementos um a um.
Causa efeitos colaterais alterando variáveis externas.
⛶List pontos = new ArrayList<>();
usuario...
7.7 IntStream e a família de Streams
Problema com Stream:
O uso de map(Usuario::getPontos) gera autoboxing, tornando a operação ineficiente.
⛶Stream stream = usuarios.stream()
.map(Usuario::getPontos);Solução com IntStream:
O ...
7.8 O Optional em java.util
Por que average() não retorna double diretamente?
Se a lista for vazia, dividir por zero resultaria em Infinity.
A solução antiga precisava de um if para evitar esse problema.
⛶double pontuacaoM...
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Interface:
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more efficient Calculator in Java
the code!!
⛶import java.util.Scanner;
public class Main
{
public static int sum(int num1,int num2){
return num1+num2;
}
public static int sub(int num1,int num2){
return n...