How to pretty print a complex Java object (e.g. with fields that are collections of objects)?

You could try and use Gson. it also serializes Arrays, Maps or whatever....

MyObject myObject = new MyObject();
Gson gson = new GsonBuilder().setPrettyPrinting().serializeNulls().create();
gson.toJson(myObject);

For deserialization use:

gson.fromJson(MyObject.class);

For typed maps see this answer: Gson: Is there an easier way to serialize a map

You can use the Jackson ObjectMapper class is use to bind data with json. you can use it like below:

ObjectMapper mapper = new ObjectMapper();

you can save json into object like below

Object json = mapper.readValue(input,object.class);

you can write that in string variable

String prettyJson = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(json);

it should work fine.

You can use GSON to convert your object to string. This will work for all the objects,

Gson gson = new Gson();
System.out.println(gson.toJson(objectYouWantToPrint).toString());

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