By how much does the array size increase when filled up to half of its capacity?

In Java, when filling an array up to half of its current size and needing to expand, a new array with an increased size is usually created. In standard implementations, such as in the ArrayList class, the size of the internal array increases by approximately 1.5 times (50%).

That is, if the array was of size N, upon expansion it will become approximately 1.5 * N.

Example from ArrayList:

int newCapacity = oldCapacity + (oldCapacity >> 1); // oldCapacity / 2

This allows balancing the frequency of expansions and memory usage.