Question

我有:

static HashMap<String,ArrayList<Media>> mediaListWithCategory=new HashMap<String,ArrayList<Media>>();

我很想:

January:
   -Sunday
   -Monday
Februsry:
   -Saturday
   -Sunday
   -Thursday
March:
   -Monday
   -Tuesday
   -Wednesday

我如何在确定散射地图时静态地分配这些价值观?

Answer 1

您可以将其安置在一个静态组:

static {
   map.put("January", Arrays.asList(new Media("Sunday"), new Media("Monday")));
}

(青年更喜欢连接到具体的班级。) 贵国的类别为<代码>Map<String, List<Media>>

Answer 2

Use a static block:

static {
  mediaListWithCategory.put(youKey, yourValue);
}

Answer 3

备选案文可能更为简明:

static HashMap<String, ArrayList<String>> map = new HashMap<String, ArrayList<String>>() {{
    put("January", new ArrayList<String>() {{
        add("Sunday");
        add("Monday");
      }});
    put("Februsry" /* sic. */, new ArrayList<String>() {{
        add("Saturday");
        add("Sunday");
        add("Thursday");
      }});
    put("March", new ArrayList<String>() {{
        add("Monday");
        add("Tuesday");
        add("Wednesday");
      }});
}};

见,Double Brace initialisation供讨论。

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