Map 转List

public class Test {
    private static final Map<String, Product> dataMap = new HashMap<>();

    static {
        Product p1 = new Product("1", "iphonex", "5555", "55");
        Product p2 = new Product("2", "iphone13", "6000", "60");
        Product p3 = new Product("3", "iphone13 pro max", "10000", "100");

        dataMap.put(p1.getId(), p1);
        dataMap.put(p2.getId(), p2);
        dataMap.put(p3.getId(), p3);
    }

    public static void main(String[] args) {
        Collection<Product> collection = dataMap.values();
        List<Product> list = new ArrayList<>(collection);
        System.out.println(list.toString());
    }
}

public class ConvertMapToList {
    public static void main(String[] args) {
        Map<Integer, String> map = new HashMap<>();
        map.put(10, "apple");
        map.put(20, "orange");
        map.put(30, "banana");
        map.put(40, "watermelon");
        map.put(50, "dragonfruit");
        System.out.println("\n1. Export Map Key to List...");
        List<Integer> result = map.keySet().stream().collect(Collectors.toList());
        result.forEach(System.out::println);
        System.out.println("\n2. Export Map Value to List...");
        List<String> result2 = map.values().stream().collect(Collectors.toList());
        result2.forEach(System.out::println);
        System.out.println("\n3. Export Map Value to List..., say no to banana");
        List<String> result3 = map.values().stream().filter(x -> !"banana".equalsIgnoreCase(x)).collect(Collectors.toList());
        result3.forEach(System.out::println);
    }
}