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I was trying to make something similar to this(actually you don't need to read the link to understand this question, it's just for reference), and I write this:
class CallArbiter: AtomicInteger { // error
constructor(initialValue: Int) : super(initialValue)
constructor() : super()
}
The compiler says:
Error:(8, 1) Kotlin: Class 'CallArbiter' must be declared abstract or implement abstract base class member public abstract fun toByte(): Byte defined in java.util.concurrent.atomic.AtomicInteger
I can't figure out why it requires me to implement those methods. I didn't see them in the AtomicInteger class. Everything is fine in Java.
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An AtomicInteger is used in applications such as atomically incremented counters, and cannot be used as a replacement for an Integer . However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.
AtomicInteger uses combination of volatile & CAS (compare and swap) to achieve thread-safety for Integer Counter. It is non-blocking in nature and thus highly usable in writing high throughput concurrent data structures that can be used under low to moderate thread contention.
AtomicInteger atomicInteger = new AtomicInteger(); This example creates an AtomicInteger with the initial value 0 . If you want to create an AtomicInteger with an initial value, you can do so like this: AtomicInteger atomicInteger = new AtomicInteger(123);
AtomicInteger class provides operations on underlying int value that can be read and written atomically, and also contains advanced atomic operations. AtomicInteger supports atomic operations on underlying int variable. It have get and set methods that work like reads and writes on volatile variables.
AtomicInteger extends java.lang.Number, but in Kotlin this type is mapped to kotlin.Number.
In kotlin.Number these abstract methods are defined (which you can see in its API):
toByte, toInt, toChar etc.
If you debug this line of code: AtomicInteger(2).toByte() you can see, that the method java.lang.Number::byteValue is used, this is done by using certain compiler techniques.
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