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Java Standard Classes and Packages

Java standard library classes, like Stack and various GUI classes, are grouped into many packages. Some important ones:
- java.lang Language support (e.g., String)
- java.util Utilities (Stack)
- java.io Input and output (PrintStream)
- java.awt Abstract Window Toolkit (Color)
- java.applet Applets (Applet)
- java.net Networking (Socket)
- java.sql Database Access (ResultSet)
- javax.swing Extended GUI (JButton)