如何在scala中匿名实现Java接口？

val javaInterface: JavaInterface = () => "Hello, world!"

val javaInterface = new JavaInterface {
  override def doSomething(): String = "Hello, world!"
}

implicit def functionToJavaInterface(f: () => String): JavaInterface = new JavaInterface {
  override def doSomething(): String = f()
}

val javaInterface: JavaInterface = () => "Hello, world!"

public interface JavaInterface {
    String doSomething();
}