How would unencapsulate an unsorted array structure’s fetch algorithm?

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Java

algorithm

//access the node (assumes the node is in the structure)
i=0;
while(targetKey!=data[i].key()){
i++;
}

// return a a copy of the node to the client 
return data[i].deepCopy();

What I have tried:

I would think that to unencapsulate this I would have to expose the deepCopy()'s method implementation details, right?