[lworld] RFR: 8369921: [lworld] Remove caches of primitive wrapper classes

[Chen Liang]

On Fri, 17 Oct 2025 19:28:37 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Disable use of wrapper cached values when --enable-preview and add javadoc descriptions for enable-preview.
> The wrapper classes are Byte, Short, Character, Integer, and Long.

Double and Float already do new, so they are fine. Should we update Boolean.valueOf to return `new Boolean` instead of TRUE or FALSE?

src/java.base/share/classes/java/lang/Long.java line 1020:

> 1018:     @DeserializeConstructor
> 1019:     public static Long valueOf(long l) {
> 1020:         final int offset = 128;

I recommend moving this into the preview feature block too.

src/java.base/share/classes/java/lang/Short.java line 301:

> 299:     public static Short valueOf(short s) {
> 300:         final int offset = 128;
> 301:         int sAsInt = s;

Same remark, I recommend moving this into the preview feature check block.

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PR Comment: https://git.openjdk.org/valhalla/pull/1685#issuecomment-3422526752
PR Review Comment: https://git.openjdk.org/valhalla/pull/1685#discussion_r2445312384
PR Review Comment: https://git.openjdk.org/valhalla/pull/1685#discussion_r2445313050