I’ve got an Interface SenseFitSensor. Class HardwareSensor implements it (future implements could be eg

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Editorial Team

Asked: June 15, 20262026-06-15T16:08:00+00:00 2026-06-15T16:08:00+00:00

I’ve got an Interface SenseFitSensor. Class HardwareSensor implements it (future implements could be eg DummySensor).

Now I’ve got a method which requires LinkedList<SenseFitSensor>.

public ExerciseLearner(LinkedList<SenseFitSensor> sensorList){

I cannot provvide it with a LinkedList<HardwareSensor>, because LinkedList cannot be cast to SensefitSensor.

What does work is

LinkedList<SenseFitSensor> senseFitSensors = new LinkedList<SenseFitSensor>(hardwareSensors);
    learner = new ExerciseLearner(senseFitSensors);

But a new linkedlist is created each time. Is there a better way?

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Editorial Team · Answer 1 · 2026-06-15T16:08:01+00:00

Editorial Team

You can use bounded wild cards

public ExerciseLearner(LinkedList<? extends SenseFitSensor> sensorList){

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