package holding;

/**

* RUN:

* javac holding/AsListInterface.java && java holding.AsListInterface

* OUTPUT:

* [holding.Crusty@9931f5, holding.Slush@19ee1ac, holding.Powder@1f1fba0]

* [holding.Light@1befab0, holding.Heavy@13c5982]

* [holding.Light@1186fab, holding.Heavy@14b7453]

*/

import java.util.*;

public class AsListInterface {

public static void main(String[] args) {

List<Snow> snow1 = Arrays.asList(new Crusty(), new Slush(), new Powder() );

System.out.println(snow1);

// error: incompatible types

//

// required: List<Snow>

// found: List<Powder>

// List<Snow> snow2 = Arrays.asList(new Light(), new Heavy());

List<Snow> snow3 = new ArrayList<Snow>();

Collections.addAll(snow3, new Light(), new Heavy());

System.out.println(snow3);

List<Snow> snow4 = Arrays.<Snow>asList(new Light(), new Heavy());

System.out.println(snow4);

}

}

class Snow { }

class Powder extends Snow { }

class Light extends Powder { }

class Heavy extends Powder { }

class Crusty extends Snow { }

class Slush extends Snow { }