Well I wanted to know why I can not create a class list that implements another class, for example
public List<Class<? implements Classe>> classes; This returns a syntax error ...
But I can create one of classes that extend from another class ...
public List<Class<? extends Classe>> classes; does not return any errors ...
Although the keyword is the same, extends in a generic declaration works for both class and interface. That is, you can instead create a list of everything that implements an interface, just as it creates a list of everything inherited from a class:
interface CommandExecutor { }
class Foo implements CommandExecutor { }
class Bar implements CommandExecutor { }
public List<Class<? extends CommandExecutor>> commandExecutos =
new ArrayList<Class<? extends CommandExecutor>>();