">SC_BLOCK_DATA</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/ObjectStreamConstants.html#SC_ENUM" title="class or interface in java.io" class="external-link">SC_ENUM</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/ObjectStreamConstants.html#SC_EXTERNALIZABLE" title="class or interface in java.io" class="external-link">SC_EXTERNALIZABLE</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/ObjectStreamConstan