http://docs.oracle.com/javase/7/docs/api/
- java.lang.System (System.out.print("some text");)
- java.lang.Thread
- java.awt.Button
- java.awt.Color
- java.awt.Font
- java.awt.Graphics
- java.swing.JPane
- java.util.Scanner (to process keyboard input)
- java.net (URL, HttpURLConnection, Socket, ServerSocket)
