How to define an interface and use it for a lamba

makeLambdableMethod.java

private interface NameOfInterface {
  public List getAList(Object anArgument);
}

public void useThePassedMethod(NameOfInterface thingToRun) { 
  Integer thing = 1;
  List createdList = thingToRun.getAList(thing);
}

public void callTheThingUsingTheInterface(){
  // WIth a static method which meets the specs for a lamdba
  useThePassedMethod(ClassWithMethodMatchingInterface::methodName);
  // WIth a lambda
  useThePassedMethod((anArgument) -> {
    return new ArrayList(anArgument);
  }
  
}