> Please review this PR which corrects an edge case bug for 
> java.text.DecimalFormat that causes incorrect parsing results for strings 
> with very large exponent values.
> 
> When parsing values with large exponents, if the value of the exponent 
> exceeds `Integer.MAX_VALUE`, the parsed value  is equal to 0. If the value of 
> the exponent exceeds `Long.MAX_VALUE`, the parsed value is equal to the 
> mantissa. Both results are confusing and incorrect.
> 
> For example,
> 
> 
> NumberFormat fmt = NumberFormat.getInstance(Locale.US);
> fmt.parse(".1E2147483648"); // returns 0.0
> fmt.parse(".1E9223372036854775808"); // returns 0.1
> // For comparison
> Double.parseDouble(".1E2147483648"); // returns Infinity
> Double.parseDouble(".1E9223372036854775808"); // returns Infinity
> 
> 
> After this change, both parse calls return `Double.POSITIVE_INFINITY` now.

Justin Lu has updated the pull request incrementally with one additional commit 
since the last revision:

  Address PP for exp > Long.MAX_VALUE + more exp test cases

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19075/files
  - new: https://git.openjdk.org/jdk/pull/19075/files/bc391f96..25782781

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19075&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19075&range=01-02

  Stats: 41 lines in 4 files changed: 28 ins; 5 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/19075.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19075/head:pull/19075

PR: https://git.openjdk.org/jdk/pull/19075

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