RawCollectionsExample.java Source code

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Here is the source code for RawCollectionsExample.java

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/*
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.ArrayList;
import java.util.Collection;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonParser;

public class RawCollectionsExample {
    static class Event {
        private String name;
        private String source;

        private Event(String name, String source) {
            this.name = name;
            this.source = source;
        }

        @Override
        public String toString() {
            return String.format("(name=%s, source=%s)", name, source);
        }
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static void main(String[] args) {
        Gson gson = new Gson();
        Collection collection = new ArrayList();
        collection.add("hello");
        collection.add(5);
        collection.add(new Event("GREETINGS", "guest"));
        String json = gson.toJson(collection);
        System.out.println("Using Gson.toJson() on a raw collection: " + json);
        JsonParser parser = new JsonParser();
        JsonArray array = parser.parse(json).getAsJsonArray();
        String message = gson.fromJson(array.get(0), String.class);
        int number = gson.fromJson(array.get(1), int.class);
        Event event = gson.fromJson(array.get(2), Event.class);
        System.out.printf("Using Gson.fromJson() to get: %s, %d, %s", message, number, event);
    }

}