Java Lambda 映射 map

public class Menu {/*** 菜品名稱*/private String name;/*** 菜品單價*/private Double price;/*** 菜品斤數*/private Double kilo;/*** 菜品類型：蔬菜、水果、肉類*/private String type;public Menu() {}public Menu(String name, Double price, Double kilo, String type) {super();this.name = name;this.price = price;this.kilo = kilo;this.type = type;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Double getPrice() {return price;}public void setPrice(Double price) {this.price = price;}public Double getKilo() {return kilo;}public void setKilo(Double kilo) {this.kilo = kilo;}public String getType() {return type;}public void setType(String type) {this.type = type;}} Menu pork = new Menu("豬肉", 9.9, 10.0, "肉類"); Menu beef = new Menu("牛肉", 38.8, 5.0, "肉類"); Menu chicken = new Menu("雞肉", 6.5, 30.0, "肉類"); Menu tomato = new Menu("土豆", 3.5, 30.0, "蔬菜"); Menu potato = new Menu("西紅柿", 7.5, 20.0, "蔬菜"); Menu apple = new Menu("蘋果", 3.5, 20.0, "水果"); Menu orange = new Menu("橙子", 4.0, 20.0, "水果"); List<Menu> menuList = Arrays.asList(pork, beef, chicken, tomato, potato, apple, orange); //映射 List<String> fruitNameList = menuList.stream().filter(menu -> menu.getType().equals("水果")).map(Menu::getName).collect(Collectors.toList()); fruitNameList.forEach(System.out::println); 雞肉 蘋果 橙子 List<Integer> menuNameLengthList = menuList.stream().map(Menu::getName).map(String::length).collect(Collectors.toList()); menuNameLengthList.forEach(System.out::println); 2 2 2 2 3 2 2

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