https://openjdk.java.net/ 
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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package java.security;


A public key. This interface contains no methods or constants. It merely serves to group (and provide type safety for) all public key interfaces. Note: The specialized public key interfaces extend this interface. See, for example, the DSAPublicKey interface in java.security.interfaces. 
See Also:
Since:1.1
/**
 * <p>A public key. This interface contains no methods or constants.
 * It merely serves to group (and provide type safety for) all public key
 * interfaces.
 *
 * Note: The specialized public key interfaces extend this interface.
 * See, for example, the DSAPublicKey interface in
 * {@code java.security.interfaces}.
 *
 * @since 1.1
 * @see Key
 * @see PrivateKey
 * @see Certificate
 * @see Signature#initVerify
 * @see java.security.interfaces.DSAPublicKey
 * @see java.security.interfaces.RSAPublicKey
 *
 */

public interface PublicKey extends Key {
    // Declare serialVersionUID to be compatible with JDK1.1
    
The class fingerprint that is set to indicate serialization
compatibility with a previous version of the class.

/**
     * The class fingerprint that is set to indicate serialization
     * compatibility with a previous version of the class.
     */
    static final long serialVersionUID = 7187392471159151072L;
}