第一種方法：static塊初始化

1. public class Demo{
2. private static final Map<String, String> myMap;
3. static
4. {
5. myMap = new HashMap<String, String>();
6. myMap.put("a", "b");
7. myMap.put("c", "d");
8. }
9. }

第二種方法：雙括號初始化 （匿名內部類）

1. HashMap<String, String > h = new HashMap<String, String>(){{
2. put("a","b");
3. }};

第三種方法：Guava

1. Map<String, Integer> left = ImmutableMap.of("a", 1, "b", 2, "c", 3);
2. //或者
3. Map<String, String> test = ImmutableMap.<String, String>builder()
4. .put("k1", "v1")
5. .put("k2", "v2")
6. ...
7. .build();

JAVA構造MAP並初始化MAP