Add patterns module: pattern matching from JDK 21 to 27

Type, record and primitive patterns, guards, sealed exhaustiveness, MatchException via separate compilation, and eight captured transcripts. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
2026-09-24 11:50:40 +00:00
parent 96b25c8fc4
commit bc91b9c8d0
36 changed files with 736 additions and 0 deletions
@@ -0,0 +1,54 @@
+$ javac src/SealedExhaustive.java && java SealedExhaustive     (21.0.10+7-Ubuntu-124.04)
+Circle[r=1.0] -> 3.14
+Square[side=2.0] -> 4.00
+Rect[w=2.0, h=3.0] -> 6.00
+
+$ javac src/SealedExhaustive.java && java SealedExhaustive     (25.0.4.1+1-LTS)
+Circle[r=1.0] -> 3.14
+Square[side=2.0] -> 4.00
+Rect[w=2.0, h=3.0] -> 6.00
+
+$ javac src/SealedExhaustive.java && java SealedExhaustive     (27+35)
+Circle[r=1.0] -> 3.14
+Square[side=2.0] -> 4.00
+Rect[w=2.0, h=3.0] -> 6.00
+
+$ javac broken/NotExhaustive.java     (21.0.10+7-Ubuntu-124.04)
+broken/NotExhaustive.java:8: error: the switch expression does not cover all possible input values
+        return switch (s) {
+               ^
+1 error
+
+$ javac broken/NotExhaustive.java     (25.0.4.1+1-LTS)
+broken/NotExhaustive.java:8: error: the switch expression does not cover all possible input values
+        return switch (s) {
+               ^
+1 error
+
+$ javac broken/NotExhaustive.java     (27+35)
+broken/NotExhaustive.java:8: error: the switch expression does not cover all possible input values
+        return switch (s) {
+               ^
+  missing patterns:
+      Rect _
+1 error
+
+$ javac broken/NotExhaustiveObject.java     (21.0.10+7-Ubuntu-124.04)
+broken/NotExhaustiveObject.java:3: error: the switch expression does not cover all possible input values
+        return switch (o) {
+               ^
+1 error
+
+$ javac broken/NotExhaustiveObject.java     (25.0.4.1+1-LTS)
+broken/NotExhaustiveObject.java:3: error: the switch expression does not cover all possible input values
+        return switch (o) {
+               ^
+1 error
+
+$ javac broken/NotExhaustiveObject.java     (27+35)
+broken/NotExhaustiveObject.java:3: error: the switch expression does not cover all possible input values
+        return switch (o) {
+               ^
+  missing patterns:
+      Object _
+1 error