Chapter3 - Applet Functions
4. Using HTML Parameters
/* Perhaps one of the most intresting features
of applets.
You can let others, especially webmasters,
specify options
for your applet in their HTML code.
Often used to determine background
colors
and other layout to fit in any design.
*/
import java.awt.*;
import java.applet.*;
public class ParameterExample extends Applet
{
// We'll save the first
HTM parameter as a String
String parameter1;
// the second one we
will use as an integer
int parameter2;
// third one too
int parameter3;
// we'll add param2
to param3
int result;
public void init()
{
// This method will get the specified parameter's value
// out of the HTML code that is calling the applet.
parameter1 = getParameter("param1");
// Since those are read as text we need to transform them
// to integers to be able to count with them.
parameter2 = Integer.parseInt(getParameter("param2"));
parameter3 = Integer.parseInt(getParameter("param3"));
result = parameter2 + parameter3;
}
public void paint(Graphics
g)
{
// Shows what was in the HTML param code.
g.drawString("Parameter 1 is: " + parameter1,20,20);
g.drawString("Parameter 2 is: " + parameter2,20,40);
g.drawString("Parameter 3 is: " + parameter3,20,60);
g.drawString("Parameter 2 + parameter 3 is: " + result,20,80);
}
}
/* This only works when those paramters are actually
in the HTML code.
That code for this example is :
<APPLET CODE="ParameterExample" WIDTH=200
HEIGHT=100>
<param name="param1" value="Hello">
<param name="param2" value="14">
<param name="param3" value="2">
</APPLET>
If you make applets for others make sure
to use parameters, many
will appreciate it.
*/
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