https://openjdk.java.net/ 
public interface javax.crypto.interfaces.DHPrivateKey extends javax.crypto.interfaces.DHKey, java.security.PrivateKey
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.crypto.interfaces.DHPrivateKey
  super_class: java.lang.Object
{
  public static final long serialVersionUID;
    descriptor: J
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 2211791113380396553

  public abstract java.math.BigInteger getX();
    descriptor: ()Ljava/math/BigInteger;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "DHPrivateKey.java"