嵌套字符串包含HashMap

Question

I know I have the option to make a POJO object to store this. However, I am trying to do it in a nested HashMap. Whenever I do the following I am getting Type Safety Warnings.

Map<String, Map<String, String>> map = new HashMap<String, Map<String, String>>();
map.put("fund_cde", new HashMap(){{put("ABC", "ABC is not valid message.");}});

If I set the nested HashMaps type like so:

map.put("fund_cde", new HashMap<String, String>(){{put("ABC", "ABC is not valid message");}});

I end up with this warning instead:

The serializable class does not declare a static final serialVersionUID field of type long

Any advice on correct way to do this? I had a look at How to put/get values into/from Nested HashMap but I'm still not understanding it.

Thanks!

Answer 1

There is another way to achieve this if you like you can use because I also tried in different manner that also give warning.You can use this

Map<String,String> map1=new HashMap<String,String>();
    map1.put("ABC", "XYZ");
    Map<String ,Object> map=new HashMap<String,Object>();
    map.put("axz", map1);

Answer 2

If you really want to do away with the warning. Either include a version id like:

map.put("fund_cde", new HashMap(){
        private static final long serialVersionUID = 1L;
        {put("ABC", "ABC is not valid message.");}
});

or add the @SuppressWarnings("serial") annotation to the method. If you use an IDE like eclipse it can offer you these options as auto fixes.