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Answer to Question #54922 in Java | JSP | JSF for Jax

Question #54922
** file: SafeDNS.java
** purpose: This interface defines the services required of
** to block banned sites.
public interface SafeDNS {
// blacklist(ipa) adds thus IPA to a blacklist.
// A blacklisted IPA will not be returned by the
// lookUp method.
public void blacklist(String ipa);

• Make your DNS class also implement this interface, using the fastest suitable class from
the collections framework to store and look up IPAs in a blacklist.
• Extend your test program so that sites may be blacklisted and we can test that their IPAs
are not being returned.
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