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ArrayList have a default capacity of 10 objects. As the size exceeds 10 objects, an ArrayList will internally increase its capacity. Does the capacity decrease when we remove the object from ArrayList.
If the ArrayList capacity doesn't decrease, could this lead to performance issues?
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If you call ArrayList. remove() the element at the given index is removed from the list (and all elements following it move down one index). The object itself still exists, no memory has been freed yet.
Java ArrayList s do not shrink (even though, of course they do grow) automatically.
The size of an ArrayList cannot be changed after the ArrayList is initialized.
However, ensureCapacity() method of java. util. ArrayList class can be used to increase the capacity of an ArrayList instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument.
It doesn't decrease this automatically. From the doc.
public void trimToSize() Trims the capacity of this ArrayList instance to be the list's current size. An application can use this operation to minimize the storage of an ArrayList instance.
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