What’s the difference between the System.Array.CopyTo() and System.Array.Clone()?

Question

What’s the difference between the System.Array.CopyTo() and System.Array.Clone()?
I know:
The first one performs a deep copy of the array, the second one is shallow.
but what does that mean?
Please explain with meaning/examples

Answer 1

a shallow copy is a copy of the reference and a deep copy is a copy of the structure. Object.clone() will return a deep copy, whereas Arrays.copyOf() will return a shallow copy



int[] a = {1, 2, 3, 4};

int[] b = new int[4];

b = Arrays.copyOf(a, 0, a.length);



on the heap



a

\

{1, 2, 3, 4}

/

b

///////////////////////////



int[] a = {1, 2, 3, 4};

int[] b = new int[4];

b = (int[])a.clone();



on the heap



a ->{1, 2, 3, 4}

b ->{1, 2, 3, 4}



////////////////////////



The memory consumption has doubled.

Answer 2

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Answer 3

A deep copy means the array is copied recursively, its inner arrays and objects are copied as well.



A shallow copy means only the outermost array is copied. The objects in a shallow copy of an array is the same objects as the original array. If you mutate the objects, the change will be reflected to the other copy.



On contrary, the objects of a deep copy is a copy of the objects from the original array. If you mutate the objects, the change doesn't affect the copy since they are both completely separate.



Giving example doesn't make sense.

Answer 4

shallow copy means for eg



object o = new object();

object a;



a = o;

a contains reference of only o not complete object

this is shallow copy

simply saying, shallow copy copies the structure of the object, deep copy copies structure as well as data.