guava/src/com/google/common/primitives/ImmutableIntArray.java
public ImmutableIntArray subArray(int startIndex, int endIndex) {
    Preconditions.checkPositionIndexes(startIndex, endIndex, length());
    return startIndex == endIndex
        ? EMPTY
        : new ImmutableIntArray(array, start + startIndex, start + endIndex);
  }
public ImmutableIntArray subArray(int startIndex, int endIndex) {
    Preconditions.checkPositionIndexes(startIndex, endIndex, length());
    return startIndex == endIndex
        ? EMPTY
        : new ImmutableIntArray(array, start + startIndex, start + endIndex);
  }
Returns a new immutable array containing the values in the specified range.

<p><b>Performance note:</b> The returned array has the same full memory footprint as this one
does (no actual copying is performed). To reduce memory usage, use {@code subArray(start,
end).trimmed()}.