patterns: run Guards, NullCase and MatchException demos on 21 too; add switch-on-long check

Adds broken/SwitchOnLong.java and regenerates transcripts so every 'runs on 21, 25 and 27' claim has a transcript. Additive commit. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
2026-09-24 11:54:48 +00:00
parent bc91b9c8d0
commit 65a4bbbbe3
6 changed files with 52 additions and 3 deletions
@@ -1,3 +1,11 @@
+$ javac src/Guards.java && java Guards     (21.0.10+7-Ubuntu-124.04)
+empty string
+short string: abc
+long string: abcdefgh
+negative -4
+int 12
+other
+
 $ javac src/Guards.java && java Guards     (25.0.4.1+1-LTS)
 empty string
 short string: abc
@@ -22,6 +22,10 @@ box of string hi
 box of int 7
 box of 2.5

+$ javac src/MatchExceptionDemo.java && java MatchExceptionDemo     (21.0.10+7-Ubuntu-124.04)
+MatchException: java.lang.IllegalStateException: accessor blew up
+cause: java.lang.IllegalStateException: accessor blew up
+
 $ javac src/MatchExceptionDemo.java && java MatchExceptionDemo     (25.0.4.1+1-LTS)
 MatchException: java.lang.IllegalStateException: accessor blew up
 cause: java.lang.IllegalStateException: accessor blew up
@@ -1,3 +1,9 @@
+$ javac src/NullCase.java && java NullCase     (21.0.10+7-Ubuntu-124.04)
+without case null: NullPointerException
+with case null: null!
+case null, default: null or something else
+instanceof with null: false
+
 $ javac src/NullCase.java && java NullCase     (25.0.4.1+1-LTS)
 without case null: NullPointerException
 with case null: null!
@@ -12,6 +12,26 @@ preview/PrimitiveInstanceof.java:3: error: primitive patterns are a preview feat
  (use --enable-preview to enable primitive patterns)
 1 error

+$ javac broken/SwitchOnLong.java     (21.0.10+7-Ubuntu-124.04)
+broken/SwitchOnLong.java:4: error: selector type long is not allowed
+        String s = switch (n) {          // switch on long: not allowed without the preview
+                          ^
+1 error
+
+$ javac broken/SwitchOnLong.java     (25.0.4.1+1-LTS)
+broken/SwitchOnLong.java:4: error: primitive patterns are a preview feature and are disabled by default.
+        String s = switch (n) {          // switch on long: not allowed without the preview
+                          ^
+  (use --enable-preview to enable primitive patterns)
+1 error
+
+$ javac broken/SwitchOnLong.java     (27+35)
+broken/SwitchOnLong.java:4: error: primitive patterns are a preview feature and are disabled by default.
+        String s = switch (n) {          // switch on long: not allowed without the preview
+                          ^
+  (use --enable-preview to enable primitive patterns)
+1 error
+
 $ javac --enable-preview --release 25 preview/PrimitiveInstanceof.java && java --enable-preview PrimitiveInstanceof     (25.0.4.1+1-LTS)
 100 fits in a byte: 100
 1000 fits in a short: 1000