PR - Matheus - Pratica de Lambda

src/com/github/friedrichmatheus/Carrinho.java

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+package com.github.friedrichmatheus;
+
+import java.math.BigDecimal;
+
+public class Carrinho {
+
+	public enum Categoria {
+		Tecnologia, Esporte, Vestuario, Equipamentos, Lazer
+	}
+
+	Integer id;
+	String nome;
+	BigDecimal valor;
+	Boolean temEstoque;
+	Categoria categoria;
+
+	public Carrinho(Integer id, String nome, BigDecimal valor, Boolean temEstoque, Categoria categoria) {
+		this.id = id;
+		this.nome = nome;
+		this.valor = valor;
+		this.temEstoque = temEstoque;
+		this.categoria = categoria;
+	}
+
+	public Integer getId() {
+		return id;
+	}
+	public void setId(Integer id) {
+		this.id = id;
+	}
+	public String getNome() {
+		return nome;
+	}
+	public void setNome(String nome) {
+		this.nome = nome;
+	}
+	public BigDecimal getValor() {
+		return valor;
+	}
+	public void setValor(BigDecimal valor) {
+		this.valor = valor;
+	}
+	public Categoria getCategoria() {
+		return categoria;
+	}
+	public void setCategoria(Categoria categoria) {
+		this.categoria = categoria;
+	}
+	public Boolean getTemEstoque() {
+		return temEstoque;
+	}
+	public void setTemEstoque(Boolean temEstoque) {
+		this.temEstoque = temEstoque;
+	}
+
+
+}

src/com/github/friedrichmatheus/Main.java

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+package com.github.friedrichmatheus;
+
+import java.math.BigDecimal;
+import java.util.AbstractMap;
+import java.util.AbstractMap.SimpleEntry;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import com.github.deividfrancis.Person;
+import com.github.friedrichmatheus.Carrinho.Categoria;
+
+public class Main {
+
+	private static List<Carrinho> carrinhoList = new ArrayList<Carrinho>();
+
+	static {
+		carrinhoList.add(new Carrinho(744, "Redragon Kumara", new BigDecimal(243.35), Boolean.TRUE, Categoria.Tecnologia));
+		carrinhoList.add(new Carrinho(850, "Redragon Cobra", new BigDecimal(190.20), Boolean.TRUE, Categoria.Tecnologia));
+		carrinhoList.add(new Carrinho(22, "SSD M.2", new BigDecimal(102.02), Boolean.TRUE, Categoria.Tecnologia));
+		carrinhoList.add(new Carrinho(848, "Monitor 24p 165hz", new BigDecimal(1153.00), Boolean.FALSE, Categoria.Tecnologia));
+		carrinhoList.add(new Carrinho(254, "Oculos de ciclismo", new BigDecimal(104.02), Boolean.TRUE, Categoria.Esporte));
+		carrinhoList.add(new Carrinho(78, "Molinete de pesca", new BigDecimal(175.00), Boolean.FALSE, Categoria.Esporte));
+		carrinhoList.add(new Carrinho(415, "Tenis allstar", new BigDecimal(167.00), Boolean.TRUE, Categoria.Vestuario));
+		carrinhoList.add(new Carrinho(403, "Luva de motociclista", new BigDecimal(134.00), Boolean.FALSE, Categoria.Vestuario));
+		carrinhoList.add(new Carrinho(625, "chave de fenda magnética", new BigDecimal(55.00), Boolean.TRUE, Categoria.Equipamentos));
+		carrinhoList.add(new Carrinho(573, "Tapete Geometrico", new BigDecimal(114.00), Boolean.TRUE, Categoria.Lazer));
+	}
+
+	public static void main(String[] args) {
+		//		getTecnologia();
+		//		getValorMaior();
+		//		getTemEstoque();
+		//		getSumEsport();
+		//		getEquipamento();
+		//		getOrderList();
+		//		getGroupByCategory();
+//		getHighestPrice();
+	}
+
+	public static void getTecnologia() {
+		List<String> carrinhoList = Main.carrinhoList.stream()
+				.filter(c -> c.getCategoria() == Categoria.Tecnologia)
+				.map(Carrinho::getNome)
+				.collect(Collectors.toList());
+
+		System.out.println(carrinhoList);
+	}
+
+	public static void getValorMaior() {
+		List<String> carrinhoList = Main.carrinhoList.stream()
+				.filter(c -> c.getValor().compareTo(new BigDecimal(200)) == 1)
+				.map(Carrinho::getNome)
+				.collect(Collectors.toList());
+
+		System.out.println(carrinhoList);
+	}
+
+	public static void getTemEstoque() {
+		List<String> carrinhoList = Main.carrinhoList.stream()
+				.filter(c -> c.temEstoque)
+				.map(Carrinho::getNome)
+				.collect(Collectors.toList());
+
+		System.out.println(carrinhoList);
+	}
+
+	public static void getSumEsport() {
+		BigDecimal carrinhoList = Main.carrinhoList.stream()
+				.filter(c -> c.getCategoria() == Categoria.Esporte)
+				.map(Carrinho::getValor)
+				.reduce(new BigDecimal(0),(a, n) -> a.add(n));
+
+		System.out.println(carrinhoList.intValue());
+	}
+
+	public static void getEquipamento() {
+		String carrinhoList = Main.carrinhoList.stream()
+				.filter(c -> c.categoria == Categoria.Equipamentos)
+				.map(Carrinho::getNome)
+				.findFirst()
+				.get();
+
+		System.out.println(carrinhoList);
+	}
+
+	public static void getOrderList() {
+		List<String> carrinhoList = Main.carrinhoList.stream()
+				.map(Carrinho::getNome)
+				.sorted()
+				.toList();
+
+		System.out.println(carrinhoList);
+	}
+
+	public static void getGroupByCategory() {
+		Map<Carrinho.Categoria,List<Carrinho>> carrinhoMap = Main.carrinhoList.stream()
+				.collect(Collectors.groupingBy(Carrinho::getCategoria));
+
+		System.out.println(carrinhoMap);
+	}
+
+//	public static void getHighestPrice() {
+//		Map<Carrinho, Map<Carrinho, BigDecimal>> carrinhoMap = Main.carrinhoList.stream()
+//,Collectors.)));
+//
+//		System.out.println(carrinhoMap);
+//	}
+}