# 04-pem-encodings (JEP 542): PemRoundTrip.java
--- JDK 28, no flags:
-----BEGIN PUBLIC KEY-----
round trip equal: true
--- JDK 25, no flags:
src/PemRoundTrip.java:10: error: PEMEncoder is a preview API and is disabled by default.
		String pem = PEMEncoder.of().encodeToString(kp.getPublic());
		             ^
--- JDK 25, --enable-preview:
-----BEGIN PUBLIC KEY-----
round trip equal: true