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

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Java Tutorial » Generics » Generic Collections

12. 2. 5. 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));

  }

}

12. 2. Generic Collections
	12. 2. 1.	Generics and Collections: ArrayList
	12. 2. 2.	Arrays: Storing class objects in Array as data items
	12. 2. 3.	Using Generic Comparable interface
	12. 2. 4.	A generic first-in, first-out bounded collection of objects
	12. 2. 5.	A list declared to hold objects of a type T can also hold objects that extend from T.
	12. 2. 6.	Utilities for generic ArrayList
	12. 2. 7.	Your own tree with generic user object
	12. 2. 8.	Generic to list
	12. 2. 9.	Create a typesafe copy of a raw list.
	12. 2. 10.	Create a typesafe copy of a raw map.
	12. 2. 11.	Create a typesafe filter of an unchecked iterator.
	12. 2. 12.	Create a typesafe view over an underlying raw set.
	12. 2. 13.	Create a typesafe view over an underlying raw map.
	12. 2. 14.	Create a typesafe filter of an unchecked enumeration.

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