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home » api » docs » ¤¢¤ê¤Õ¤ì¤¿ » ref » com » sun » À±¡¿¼çÌò¤Ë¤¹¤ë » beans

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º÷°ú

Elements' Í×Ìó

Elements' ¾ÜºÙ¡Ê¤Ë½Ò¤Ù¤ë¡Ës

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:: com :: sun :: À±¡¿¼çÌò¤Ë¤¹¤ë :: beans ::

template struct Optional<T>

Description An optional value of a given type. This structure is used as the type of interface ¤»¤¤¤Ë¤¹¤ës corresponding to instances of ½êͭʪ¡¿»ñ»º¡¿ºâ»º that have the PropertyAttribute::MAYBEVOID. It might also be useful in other ¾õ¶·¡¿¾ðÀªs, for example as the return type of an interface method.

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Elements' Í×Ìó
IsPresent	¼¨¤¹s this structure instance as having an actual value.
Value	The actual value of this structure instance.

Elements' ¾ÜºÙ¡Ê¤Ë½Ò¤Ù¤ë¡Ës

IsPresent boolean IsPresent; Description ¼¨¤¹s this structure instance as having an actual value.

Value T Value; Description The actual value of this structure instance. If no actual value is ¸½ºß¤Î, a À¸»º¼Ô of such a structure instance should leave this member defaulted, and a ¾ÃÈñ¼Ô of such a structure instance should ignore the ÌÀ³Î¤Ê¡¿ºÙÉô value Ãߤ¨¤ë¡¿Å¹d in this member.

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