java.security.certParses and manages certifi cates.
java.security.interfacesDefi nes interfaces for DSA (Digital Signature Algorithm) keys.
java.security.specSpecifi es keys and algorithm parameters.
java.sqlCommunicates with a SQL (Structured Query Language) database.
java.utilContains the common utilities.
java.util.concurrent Supports the concurrent utilities.
java.util.jarCreates and reads JAR fi les.
java.util.loggingSupports logging of information relating to user preference.
java.util.prefsEncapsulates information relating to user and system preferences.
java.util.regx ...
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