Gson User Guide - gson

Serializing and Deserializing Collection with Objects of Arbitrary Types Sometimes you are dealing with JSON array that contains mixed types. For example: The equivalent Collection containing this is: Collection collection = new ArrayList(); collection.add("hello"); collection.add(5); collection.add(new Event("GREETINGS", "guest")); Where the Event class is defined as: class Event { private String name; private String source; private Event(String name, String source) { this.name = name; this.source = source; You can serialize the collection with Gson without doing anything specific: toJson(collection) would write out the desired output. However, deserialization with fromJson(json, Collection.class) will not work since Gson has no way of knowing how to map the input to the types. Option 1: Use Gson's parser API (low-level streaming parser or the DOM parser JsonParser) to parse the array elements and then use Gson.fromJson() on each of the array elements.This is the preferred approach. Compact Vs.

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