CODEWITHSUNDEEP
javaandroidkotlinandroid-room
Marian Paździoch
Marian Paździoch

Reputation: 9103

Why Room's @Database gets entities as arrayOf in Kotlin, while Java does not take array?

When I define Room's database with @Database in Java:

@Database(entities = {JustSomeEntity.class}, version = 1)

When I define Room's database with @Database in Kotlin:

@Database(entities = arrayOf(JustSomeEntity::class), version = 1)

Please note the arrayOf in Kotlin version.

See official docs for reference - you can toggle Java/Kotlin there and see.

Is this some kind of Java / Kotlin / annotations quirk? Why is that? Where it comes from?

Upvotes: 1

Views: 196

Answers (1)

vrgrg
vrgrg

Reputation: 616

In Java curly braces define an array of values. See the docs:

Alternatively, you can use the shortcut syntax to create and initialize an array:

int[] anArray = { 
   100, 200, 300,
   400, 500, 600, 
   700, 800, 900, 1000
};

https://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

Upvotes: 1

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