A question about the differences between interface and class

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as mentioned in the manual , "classes allow behavior to be implemented on the client side, whereas interfaces allow behavior to be implemented only on the server side" .
i want to know why interfaces can't be implemented in the client side ?
if the classes don't have the data,just only the operation.what are the differences between the classes and the interface?
thanks ..
i want to know why interfaces can't be implemented in the client side ?
if the classes don't have the data,just only the operation.what are the differences between the classes and the interface?
thanks ..
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