JDK-8265130 : Make ConstantDesc class hierarchy sealed
- Type: Enhancement
- Component: core-libs
- Sub-Component: java.lang
- Affected Version: 17
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2021-04-13
- Updated: 2022-03-19
- Resolved: 2021-06-02
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| JDK 17 |
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17 b25Fixed  |
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Description
The class hierarchy rooted at `ConstantDesc` in package `java.language.constant` is used to denote a nominal descriptor for a loadable constant value, as defined in JVMS 4.4.
The javadoc for these classes mentions that this hierarchy may become sealed if supported by the Java language, for example:
* @apiNote In the future, if the Java language permits, {@linkplain ConstantDesc}
* may become a {@code sealed} interface, which would prohibit subclassing except by
* explicitly permitted types. Clients can assume that the following
* set of subtypes is exhaustive: {@link String}, {@link Integer},
* {@link Long}, {@link Float}, {@link Double}, {@link ClassDesc},
* {@link MethodTypeDesc}, {@link MethodHandleDesc}, and
* {@link DynamicConstantDesc}; this list may be extended to reflect future
* changes to the constant pool format as defined in JVMS 4.4.
Now JEP 409 proposes that sealed classes become a final feature, we can amend the class hierarchy to be sealed.
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