https://openjdk.java.net/ 
public interface java.security.Key extends java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.security.Key
  super_class: java.lang.Object
{
  public static final long serialVersionUID;
    descriptor: J
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 6603384152749567654

  public abstract java.lang.String getAlgorithm();
    descriptor: ()Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract java.lang.String getFormat();
    descriptor: ()Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract byte[] getEncoded();
    descriptor: ()[B
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "Key.java"