Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 15:08:50 +00:00
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+$ java --enable-preview PemDemo     (JDK 27)
+--- public key, encoded
+-----BEGIN PUBLIC KEY-----  ...  -----END PUBLIC KEY-----
+--- private key, encoded
+-----BEGIN PRIVATE KEY-----  ...  -----END PRIVATE KEY-----
+CHECK ok   : a PublicKey encodes as BEGIN PUBLIC KEY
+CHECK ok   : a PrivateKey encodes as BEGIN PRIVATE KEY (PKCS#8)
+CHECK ok   : the decoded public key equals the original
+CHECK ok   : the decoded private key equals the original
+--- decode(String) returns whatever the header says it is
+-----BEGIN PUBLIC KEY-----  ->  PublicKey (EC)
+-----BEGIN PRIVATE KEY-----  ->  PrivateKey (EC)
+--- encrypted private key
+-----BEGIN ENCRYPTED PRIVATE KEY-----
+CHECK ok   : withEncryption produces ENCRYPTED PRIVATE KEY
+decoded with no password: javax.crypto.EncryptedPrivateKeyInfo
+CHECK ok   : without a password you get the still-encrypted structure back
+CHECK ok   : with the password you get the original private key
+--- PEM(type, byte[]) does NOT Base64-encode: the bytes go in as they are
+-----BEGIN ANKURM DEMO-----
+hello, pem
+-----END ANKURM DEMO-----
+CHECK ok   : raw bytes appear verbatim between the header and footer
+--- give it the Base64 text and it round-trips
+-----BEGIN ANKURM DEMO-----
+aGVsbG8sIHBlbQ==
+-----END ANKURM DEMO-----
+CHECK ok   : type, Base64 text (content()) and decoded payload (decode()) all survive
+exit=0