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

Figure 14-77. java.security.interfaces.DSAPublicKey

public interface DSAPublicKey extends DSAKeyjava.security.PublicKey {
// Public Constants
1.2  public static final long serialVersionUID;  =1234526332779022332
// Public Instance Methods
     java.math.BigInteger getY( );  
}