Parse JSON string to Dictionary<String, Integer> with Gson

Question

I have a JSON string which looks as following: {"altruism":1,"amazon":6}

What I want to have is a HashMap<String, Integer> with two entries afterwards.

Key: altruism Value: 1
Key: amazon Value:6

I really can't figure out how to do this. Normally there are objects parsed from JSON strings, but that's not the case here.

Be clear that JSON is not Gson. JSON is a data format. Gson is a Java library for reading and writing JSON. — Programmer Bruce
– Programmer Bruce, Commented Jul 19, 2011 at 4:55

Programmer Bruce · Accepted Answer · 2011-07-19 05:11:13Z

19

Gson makes what you're trying to do relatively easy. Following is a working example.

// input: {"altruism":1,"amazon":6}
String jsonInput = "{\"altruism\":1,\"amazon\":6}";

Map<String, Integer> map = new Gson().fromJson(jsonInput, new TypeToken<HashMap<String, Integer>>() {}.getType());
System.out.println(map); // {altruism=1, amazon=6}
System.out.println(map.getClass()); // class java.util.HashMap
System.out.println(map.keySet().iterator().next().getClass()); // class java.lang.String
System.out.println(map.get("altruism").getClass()); // class java.lang.Integer

answered Jul 19, 2011 at 5:11

Programmer Bruce

67.3k7 gold badges101 silver badges97 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Parse JSON string to Dictionary<String, Integer> with Gson

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related