rangeCheck.java

private static void rangeCheck(int arrayLen, int fromIndex, int toIndex) {
     if (fromIndex > toIndex)
          throw new IllegalArgumentException("fromIndex(" + fromIndex + ") > toIndex(" + toIndex+")");
     if (fromIndex < 0) 
          throw new ArrayIndexOutOfBoundsException(fromIndex);
     if (toIndex > arrayLen) 
          throw new ArrayIndexOutOfBoundsException(toIndex);
}

Good to throws exception/s in a E get(int index)
e.g.
1.
public E get(int index) {
RangeCheck(index);
return (E) elementData[index];
}
2.
private void RangeCheck(int index) {
if (index >= size)
throw new IndexOutOfBoundsException(
"Index: "+index+", Size: "+size);
}