+ return newValue;
+ }
+
+ /**
+ * Throws ArithmeticException if adding addend to value would exceed the range
+ * of int
+ *
+ * @param value
+ * @param addend
+ */
+ static void checkOverflow(int value, int addend)
+ {
+ /*
+ * test cases being careful to avoid overflow while testing!
+ */
+ if (addend > 0)
+ {
+ if (value > 0 && Integer.MAX_VALUE - value < addend)
+ {
+ throw new ArithmeticException("Integer overflow adding " + addend
+ + " to " + value);
+ }
+ }
+ else if (addend < 0)
+ {
+ if (value < 0 && Integer.MIN_VALUE - value > addend)
+ {
+ throw new ArithmeticException("Integer underflow adding " + addend
+ + " to " + value);
+ }
+ }