How can I take the elements in a Json array and put the contents in an arraylist?

Question

First off I just want to say I'm a beginner and any help I can get would be great.

I created a car class in a form application. Each car has three propertes: spaceNum, make, and model.

I'm storing each car into an an arraylist. Before exiting the program I write the contents of the arraylist to a file named save.json.

The contents are as follows:

[{"spaceNum":"2","make":"b","model":"b"},{"spaceNum":"3","make":"c","model":"c"},{"spaceNum":"4","make":"d","model":"d"},{"spaceNum":"1","make":"a","model":"a"}]

As you can see there are four Cars stored in my arraylist.

My question is - How can I get the array from my save.json file, where I can then try to put it back into an arraylist?

Answer 1

我将jackson用于所有json序列化，因此，假设您有Car类，则可以执行类似的操作。

List<Car> cars = new ObjectMapper().readValue(new File("save.json"), TypeFactory.defaultInstance().constructCollectionType(List.class, Car.class);