When we use the terms frame, applet, panel,
component, label, text field, and button, we
refer to instances of the JFrame
, JApplet
, JPanel
,
JComponent
, JLabel
, JTextField
, and JButton
classes. The older, less capable classes, which have names such as
Frame
and Applet
, and their arrangement in the hierarchy,
were retained in Java
for backward compatibility.