GUI Helper Classes Dimension Classes in the java. awt Layout Manager package Heavyweight Font FontMetrics O Color 匚 Panel[Apk{ Japplet Graphi I Component K Container Window K Frame Jframe Dialog JDialog The helper classes are not ar Swing Components subclasses of Component opponet in the javax. swing package They are used to describe the properties of gui components Lightweight such as graphics context colors, fonts, and dimension. tion to Java Programming, revised by daiLiang,Introduction to Java Programming,revised by Dai-kaiyu 9 GUI Helper Classes Dimension Font FontMetrics Component Graphics Object Color Container Panel Applet Frame Dialog Window JComponent JApplet JFrame JDialog Swing Components in the javax.swing package Lightweight Heavyweight Classes in the java.awt package 1 LayoutManager * JPanel The helper classes are not subclasses of Component. They are used to describe the properties of GUI components such as graphics context, colors, fonts, and dimension