Existen varias API de Reflection que devuelven clases, pero solo se puede acceder a ellas si ya se ha obtenido una Clase, ya sea directa o indirectamente.
Class.getSuperclass()
Returns the super class for the given class.
Class c = javax.swing.JButton.class.getSuperclass();
The super class of javax.swing.JButton is javax.swing.AbstractButton.
Class.getClasses()
Devuelve todas las clases públicas, interfaces y enumeraciones que son miembros de la clase, incluidos los miembros heredados.
Class<?>[] c = Character.class.getClasses();
Character contiene dos clases miembro Character.Subset y
Character.UnicodeBlock.
Class.getDeclaredClasses()
Returns all of the classes interfaces, and enums that are explicitly declared in this class.
Class<?>[] c = Character.class.getDeclaredClasses();
Character contains two public member classes Character.Subset and Character.UnicodeBlock and one private class
Character.CharacterCache.
Class.getDeclaringClass()
java.lang.reflect.Field.getDeclaringClass()
java.lang.reflect.Method.getDeclaringClass()
java.lang.reflect.Constructor.getDeclaringClass()
Returns the Class in which these members were declared. Anonymous Class Declarations will not have a declaring class but will
tener una clase de cierre.
import java.lang.reflect.Field;
Field f = System.class.getField("out");
Class c = f.getDeclaringClass();
The field out is declared in System.
public class MyClass {
static Object o = new Object() {
public void m() {}
};
static Class<c> = o.getClass().getEnclosingClass();
}
The declaring class of the anonymous class defined by o is null.
Class.getEnclosingClass()
Returns the immediately enclosing class of the class.
Class c = Thread.State.class().getEnclosingClass();
The enclosing class of the enum Thread.State is Thread.
public class MyClass {
static Object o = new Object() {
public void m() {}
};
static Class<c> = o.getClass().getEnclosingClass();
}
The anonymous class defined by o is enclosed by MyClass.