implements

They both mean "inherits from." They're both a way to specify a parent-chld type relationship. In certain cases implements is the only correct syntax, and in other cases, extends is the only correct syntax. You don't get a choice of which one to use once you decide the class/interface permutation involved.

jverda at 2007-7-9 23:10:00 >

> thx jverd.i wonder why does implement allows u to

> inher mutiple classes while extend allows only one

> class.

It's not an implements vs extends issue. It's an interfaces vs. classes issue.

class Class1 extends Class2, Class3 // not allowed

class Class1 extends Class2 implements Int1, Int2 // allowed

interface Int1 extends Int2, Int3 // allowed

jverda at 2007-7-9 23:10:00 >

You implement interfaces and extend classes. when you implement an interface you apply implementation to the methods in the interface. When you extend a class you inheret the methods from that class. You can only extend one class and you can implement multiple classes because that is how they developed java.

alien08o8a at 2007-7-9 23:10:00 >