OnJava8-Examples/collections/AsListInference.java

// collections/AsListInference.java
// (c)2021 MindView LLC: see Copyright.txt
// 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
  }
}