List of everything that implements such a class

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Well I wanted to know why I can’t create a list of classes that implement 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; returns no error...

java

  • You mean, implement an interface, right?

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Although the keyword is the same, extends in a generic statement works for both class and interface. That is, you can create a list of everything that implements an interface, in the same way that creates a list of everything you inherit from a class:

interface CommandExecutor { }

class Foo implements CommandExecutor { }
class Bar implements CommandExecutor { }

public List<Class<? extends CommandExecutor>> commandExecutos =
    new ArrayList<Class<? extends CommandExecutor>>();

Example in the ideone (same example with classes).

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