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Editorial Team
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Asked: 2026-05-28T05:53:51+00:00

I got the unchecked expression error when compiling and found the offending line to

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I got the unchecked expression error when compiling and found the offending line to be 

ArrayList<Integer> items = (ArrayList<Integer>) this.items.clone();

I am trying to perform a deep copy of my object so I am cloning a property of the object and array list in the above manner. How can I fix this warning?

  • I could use @SuppressWarnings("unchecked") but that is just hiding the problem (tho I expect none)
  • If I clone manually by looping through all elements to it will be slower I think

Whats the correct way of doing this?

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1 Answer

  1. Editorial Team

    If your elements are Integers, performing a “deep copy” really isn’t an issue, since there’s no reason why you would need to copy an Integer object. Just use new ArrayList<Integer>(this.items).

    But for reference, neither clone() nor the ArrayList copy constructor will do a deep copy. It’s only because your element types don’t need deep copying that this satisfies your needs.

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