Assign Json values to class variables or Map with Gson examples.

JavaGsonBasics

public class Main {

    public static void main(String[] args) {
        Gson gson = new Gson();
        String file;
        JsonObject jsonObject;
        
        // used in the map example only
        Type type = new TypeToken<Map<String, String>>(){}.getType();
        FileReader json = null;
        
        // save values to vars in a class 
        try {
            file = String "path/to/file.json"
            FileReader json = new FileReader(file);
            jsonObject = gson.fromJson(json, JsonObject.class);
            String this.memberVariable = jsonObject.get("jsonKey").getAsString();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        
        //convert json to java map
        
        try {
            file = String "path/to/file.json"
            json = new FileReader(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        Map<String, String> mapName = gson.fromJson(json, type);
    }
}