package com.alexstyl.specialdates.wear;

public abstract class SharedConstants {

    public static final String NEXT_CONTACT_EVENTS_PATH = "/next-contact-events";
    public static final String KEY_DATE = "key_date";
    public static final String KEY_CONTACTS_NAMES = "key_contacts_names";

}

package com.alexstyl.specialdates.wear;

public final class SharedConstants {

    public static final String NEXT_CONTACT_EVENTS_PATH = "/next-contact-events";
    public static final String KEY_DATE = "key_date";
    public static final String KEY_CONTACTS_NAMES = "key_contacts_names";

    private SharedConstants() {
        // not instantiable
    }

}

Make SharedConstants final and not instantiable