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 +1,31 @@
+public class PrimitiveSwitch {
+    static String httpFamily(int status) {
+        return switch (status) {
+            case 200 -> "OK";
+            case int i when i >= 200 && i < 300 -> "other success " + i;
+            case int i when i >= 400 && i < 500 -> "client error " + i;
+            case int i -> "something else " + i;
+        };
+    }
+
+    static String flag(boolean b) {
+        return switch (b) {
+            case true -> "yes";
+            case false -> "no";
+        };
+    }
+
+    static String big(long n) {
+        return switch (n) {
+            case 0L -> "zero";
+            case 1L -> "one";
+            case long l -> "many (" + l + ")";
+        };
+    }
+
+    public static void main(String[] args) {
+        System.out.println(httpFamily(200) + " | " + httpFamily(204) + " | " + httpFamily(404) + " | " + httpFamily(500));
+        System.out.println(flag(true) + " " + flag(false));
+        System.out.println(big(0) + " " + big(1) + " " + big(Long.MAX_VALUE));
+    }
+}