初始化
public void demo(){private Map<String, String> mMap = new HashMap<String, String>();mMap.put("k1","v1");mMap.put("k2","v2");
}public void demo(){private Map<String, String> mMap = new HashMap<String, String>(){{put("k1","v1");put("k2","v2");
}}
}
public void demo(){Map.of("k1","v1","k2","v2")
}public void demo(){Map<Stirng, Stirng> mMap = ImmutableMap.of("k1","v1","k2","v2");
}