In the java.lang.String API (doc:///doc/api/java.lang.String.html),
the substring(int beginIndex,int endIndex) method is claimed to return
a substring from beginIndex (inclusive) to endIndex (exclusive).

In the alpha3 implementation, however, the returned substring is
independent of the order of arguments -- what it returns is from lower
index (inclusive) to upper index (exclusive). For example, the
following code compiles, runs, and prints "2345".

class xxx {
    public static void main (String args[]) {
String s = "0123456789";
System.out.println (s.substring(6,2));
    }
}