How to return a interface like javawith Kotlin

Question

this is my KotlinInterface.kt

interface KotlinInterface {
fun fun1()
fun fun2()
}

this is my JavaClass.java

public class JavaClass {
public KotlinInterface test() {
    return new KotlinInterface() {
        @Override
        public void fun2() {

        }

        @Override
        public void fun1() {

        }
    };
}

}

this is my KotlinClass.kt

class KotlinClass {
    fun test():KotlinInterface{
        return KotlinInterface{
            //how to return like java
        }
    }
}

I want to know how to return a interface with kotlin like with java ,thanks everybody

score 2 · Accepted Answer · answered Jun 21 '17 at 15:39

2

In Kotlin, you can create an anonymous class that implements an interface like this:

object : KotlinInterface {
    override fun fun1() {
        ...
    }
    override fun fun2() {
        ...
    }
}

That will give a reference to your anonymous class. You just need to return that.

answered Jun 21 '17 at 15:39

Steven Schoen

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thanks for your help – 谢林志 Jun 21 '17 at 15:52

score 2 · Answer 2 · answered Jun 21 '17 at 15:51

class KotlinClass {
fun test():KotlinInterface{
    return object :KotlinInterface{
        override fun fun1() {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        }

        override fun fun2() {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
        }

    }
}
}

How to return a interface like javawith Kotlin

2 Answers2