A list declared to hold objects of a type T can also hold objects that extend from T.

    

import java.util.ArrayList;
import java.util.List;

public class Main {
  public static void main(String[] argv) {

    List<Number> numlist = new ArrayList<Number>();

    numlist.add(new Integer(123));
    numlist.add(new Float(123));
  }
}

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A list declared to hold objects of a type T can also hold objects that extend from T. : Generic Collection « Generics « Java

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