Why is “out of range” not thrown for ‘substring(startIndex, endIndex)’

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According to the Java API doc, substring throws an error when the start index is greater than the Length of the String.

IndexOutOfBoundsException – if
beginIndex is negative or larger than
the length of this String object.

In fact, they give an example much like yours:

"emptiness".substring(9) returns "" (an empty string)

I guess this means it is best to think of a Java String as the following, where an index is wrapped in |:

|0| A |1| B |2| C |3| D |4| E |5|

Which is to say a string has both a start and end index.

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