OnJava8-Examples/collections/AsListInference.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// collections/AsListInference.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

class Snow {}

class Powder extends Snow {}

class Light extends Powder {}

class Heavy extends Powder {}

class Crusty extends Snow {}

class Slush extends Snow {}

public class AsListInference {

public static void main(String[] args) {

List<Snow> snow1 = Arrays.asList(

new Crusty(), new Slush(), new Powder());

//- snow1.add(new Heavy()); // Exception

//- snow1.remove(0); // Exception

List<Snow> snow2 = Arrays.asList(

new Light(), new Heavy());

//- snow2.add(new Slush()); // Exception

//- snow2.remove(0); // Exception

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

Collections.addAll(snow3,

new Light(), new Heavy(), new Powder());

snow3.add(new Crusty());

snow3.remove(0);

// Hint with explicit type argument specification:

List<Snow> snow4 = Arrays.<Snow>asList(

new Light(), new Heavy(), new Slush());

//- snow4.add(new Powder()); // Exception

//- snow4.remove(0); // Exception

}