Allows java programs to run in browsers. It is the swing version of Applet and it
behaves the same.
By adding the following method to your Applet, you can allow it be run either as an Applet or as an application.
If your Applet were called MyApplet, here is the code to add to the MyApplet class to make it also into an
Your Applet can get hold of the parameters in the HTML (Hypertext Markup Language).
That code is quite crude. It will not do such things as:
Simulate the getParameter method to get at the JApplet parameters.
Adjust the coordinate system so part of the JApplet is not hidden under the
JFrame menu bar. Layout managers deal with this automtically, but if you do absolute
positioning, you have to compensate manually.
The easiest way to deal with these problems is to use two JApplet constructors, one
the usual default constructor and one that passes the param information in. Inside you can keep track of which
mode you are running in with a boolean you set in the constructor. getParameter( favouriteColour ) will return the String
orange. When you write an Applet often you will override some of the
following methods: init(), start(), stop(), destroy() and paint(Graphics g). There
is equivalent code for Applet.
Converting an Applet to a JApplet
Here is how I convert an Applet to a JApplet.
Change extendsApplet to extendsJApplet.
Change component types from Button to JButton,
Label to JLabel (Label.
LEFT to JLabel. LEFT
etc.), TextField to JTextField, TextArea to JTextArea, Frame to
JFrame. You won’t get compiler errors if you erroreously leave some old AWT (Advanced Windowing Toolkit)
components in there.
Convert Choice to JComboxBox. Rename the Choice. select method to JComboxBox.
setSelectedItem or JComboxBox.setSelectedIndex. You can often simplify the logic by feeding the JComboBox composite objects for
the choices with a toString method for the string to display.
Insert ContainercontentPane = getContentPane(); then use contentPane. setLayout, contentPane. setBackground and
contentPane.add instead of using the JApplet methods. You won’t get compile-time error messages if you fail to do this. If you
screw up, your code may work under Java version 1.6 but not older JDKs (Java Development Kits).