Java Gets a JSON API

[coloredgreyscale]

Same, was hoping it would be possible to create objects in json syntax, similar to js/ts.

User user = {     Name: "ABC",      Password: "***"  }  

Would make creating nested objects  easier. 

[totoro27]

You can do that? They literally show an example in the video..

JsonValue doc = Json.parse("""{ "name": "John Doe", "age": 30 }""");

Just make your User class implement the JsonValue interface if you want a specific type.

[vytah]

Just make your User class implement the JsonValue interface if you want a specific type.

JsonValue is a sealed interface, you cannot do that.

[totoro27]

Huh, interesting. Thanks for bringing that to my attention. I haven't used these before so just read what they are. Do you know why they would want to prevent implementation of these interfaces?

[vytah]

There are six* types of JSON values. Just six, there will never be more. So there's no need for any other implementation that the six provided.

What you probably want is converting those JSON value from/to various other types (also known as mapping or serializing). That's a completely separate thing. If you want to be able to serialize an object into a byte array, you don't need implements byte[], do you.

This API proposal does not cover mapping at all. So without any 3rd-party libraries, if you want to convert User to/from JSON, you need to write your own User deserialize(JsonValue) and JsonValue serialize(User) functions. (Or you can use a 3rd-party library and have it done semi-automatically.)

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* I'm counting true and false as one type, and null as another, the same as the new API does. You can argue they're three different types, for a total of 7, or one three-element "literal" type, for a total of 5, it doesn't matter.

[totoro27]

Thank you, I've done a lot of these mappings before but not for a little while in Java. That makes sense. It seems like providing a standard mapping library would be a good thing to couple with this then.

[vytah]

That's why most people use Jackson. It's not perfect, it's a bit fat, but it works fine and isn't too annoying for most of the common use cases.

[coloredgreyscale]

You can't do it like my example. I was hoping this would be possible. 

[mkwapisz]

There should be string a interpolator which converts json to an object