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Dynamic method resolution

 
Kannan BLR
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Hi friends,

Advantage of interface is Dynamic method resolution. I saw that one in some books.But I don't know about Dynamic method resolution.
please Any one help me .
 
Stan James
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When you ihave a variable or argument whose type is an interface, the compiler can be sure the object that the variable refers to at runtime will have the method. But the compiler can't locate the exact code for that method because all it knows for sure is the interface.

Suppose you have a method that takes a List argument and you call a method on the argument. At runtime the JRE has to dynamically call the code defined in the object that's really passed in. It might be the LinkedList code or the ArrayList code. In the early days of OO this dynamic lookup was considered by some to be a fatal flaw - too much overhead and almost guaranteed to cause virtual memory paging. Nowadays it's taken for granted.

More clear or less?
[ May 14, 2005: Message edited by: Stan James ]
 
vignesh gopalakrishnan
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Stan James wrote:When you ihave a variable or argument whose type is an interface, the compiler can be sure the object that the variable refers to at runtime will have the method. But the compiler can't locate the exact code for that method because all it knows for sure is the interface.

Suppose you have a method that takes a List argument and you call a method on the argument. At runtime the JRE has to dynamically call the code defined in the object that's really passed in. It might be the LinkedList code or the ArrayList code. In the early days of OO this dynamic lookup was considered by some to be a fatal flaw - too much overhead and almost guaranteed to cause virtual memory paging. Nowadays it's taken for granted.

More clear or less?
[ May 14, 2005: Message edited by: Stan James ]



stan james .. i did read the information you provided for this thread . i can sense some information what you are trying to say . but i can't get enough crystal clear answer sir .. so , if you don't mind show me with a powerful example that which will never ever get out from my mind. please..??
 
Matthew Brown
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He wrote that seven years ago, so I think there's a fair chance Stan isn't following this thread any more.
 
vignesh gopalakrishnan
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Matthew Brown wrote:He wrote that seven years ago, so I think there's a fair chance Stan isn't following this thread any more.



oh. that's ok . thanks anyways matthew brown .
 
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