why we use interface instead of abstract class

[Sanju]

HI,
Abstract class and interfaces both we have to declare methods. at what situation we can use abstract class and interfaces. both should have to use declared methods. but why mostof the time we prefer interfaces? why not abtstract class.

plz explain any body,
Sanju.

[William Brogden]

For one thing, a class can extend only one abstract class but it can implement any number of interfaces.
Bill
[ January 05, 2005: Message edited by: William Brogden ]

[Jessica Sant]

closing this duplicate thread. Please don't post the same question in multiple forums. You can find the original thread here.