This interface represents a DSA private key and provides direct access to the underlying key value. If you are working with a private key you know is a DSA key, you can cast the PrivateKey to a DSAPrivateKey.

Figure 14-76. java.security.interfaces.DSAPrivateKey

public interface DSAPrivateKey extends DSAKeyjava.security.PrivateKey {
// Public Constants
1.2  public static final long serialVersionUID;  =7776497482533790279
// Public Instance Methods
     java.math.BigInteger getX( );  
}