@Override
	public int hashCode() {
		int hashCode = 1;
		for (int i = 0; i < _size; i++) {
			hashCode = 31*hashCode + _data[i];
		}

		return hashCode;
	}
Returns the hash code value for this list.

<p>This implementation uses exactly the code that is used to define the
list hash function in the documentation for the {@link List#hashCode}
method.</p>

@return the hash code value for this list
runtime/Java/src/org/antlr/v4/runtime/misc/IntegerList.java