https://openjdk.java.net/ 
public interface javax.crypto.SecretKey extends java.security.Key, javax.security.auth.Destroyable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.crypto.SecretKey
  super_class: java.lang.Object
{
  public static final long serialVersionUID;
    descriptor: J
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: -4795878709595146952
}
SourceFile: "SecretKey.java"