《Java编程思想》学习笔记 14.3.1 使用类字面常量

如果我们用类字面常量重新实现PetCount，那么改写后的结果在许多方面都会显得更加清晰：
//: typeinfo/pets/LiteralPetCreator.java
// Using class literals.
package typeinfo.pets;
import java.util.*;

public class LiteralPetCreator extends PetCreator {
//No try block needed.
@Suppresswarnings(“unchecked”)
public static final List> allTypes = Collections.unmodifiableList(Arrays.asList(Pet.class,Dog.class,Cat.class,Rodent.class,Mutt.class,Pug.class,EgyptianMau.class,Hamster.class));
//Types for random creation:
private static final List> types = allTypes.subList(allTypes.indexOf(Mutt.class),allTypes.size());
public List> types() {
return types;
}
public static void main(String[] args) {
System.out.println(types);
}
}//:~
该示例的输出与PetCount.java相同。