This is known as being a Callable Reference: val str = "Hello"
Once we have obtained a method reference, we can call it as if was really the method in question. However, in Kotlin this method reference can also be used to get reflection information about the target. This looks exactly the same as in Java 8 to obtain a method reference, and we can use it in exactly the same way. In exactly the same way as with classes, we can obtain a reference to a Method or Property using the :: operator.
JAVA REFLECTION GET PRIVATE FIELD CODE
As before, this works equally well on code written in standard Java as it does on code written in Kotlin. This includes class properties – defined with val or var, standard class methods, and top-level functions. In a very similar way, we can get access to all of the methods, properties, extensions, and other members of the class: val bigDecimalClass = BigDecimal::class These are all Method references as discussed in the next section. We can create new instances of a class from a Class Reference as well, in much the same way as in Java: val listClass = ArrayList::classĪlternatively, we can access the constructors and use an explicit one if we need to. Println(TestObject::class.objectInstance) Println(TestWithCompanion::panionObjectInstance) Kotlin adds to this the ability to obtain the Companion Object for an arbitrary class, and the Object instance for an Object class: println(TestWithCompanion::panionObject) In Java, we can already move from a Class to its superclass, interfaces and the outer class it’s enclosed in – if appropriate. We also have ways to move around the class hierarchy. Some of these are standard Java concepts, and others are Kotlin specific concepts.įor example, we can easily find out if a Class is Abstract or Final, but we can also find out if the Class is a Data Class or a Companion Class: val stringClass = String::classĪssertEquals("kotlin.String", stringClass.qualifiedName) Once we have obtained a KClass object, there are some simple things that it can tell us about the class in question. Val kotlinClass: KClass = someClass.kotlin
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