JDK15新特性 JEP 385 Deprecate RMI Activation for Removal JEP 371 Hidden Classes JEP 339 Edwards-Curve Digital Signature Algorithm (EdDSA) JEP 375 Pattern Matching for instanceof (Second Preview) JEP 384 Records (Second Preview) JEP 360 Sealed Classes (Preview) JEP 378 Text Blocks
