How do I copy the contents of one ArrayList into another?

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You can use such trick:

myObject = new ArrayList<Object>(myTempObject);

or use 

myObject = (ArrayList<Object>)myTempObject.clone();

You can get some information about clone() method here

But you should remember, that all these ways will give you a copy of your List, not all of its elements. So if you change one of the elements in your copied List, it will also be changed in your original List.

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