Java Applet Parameter Passing

Param Tag Java

Java applet allows us to pass user defined parameters using <applet > Tag.

What is PARAM Tag

  • Param tag is used to handle parameters passed to an html document.
  • Param tag has 2 parameters - Name and value. where Name is the user defined name like variables and value is the value to be stored into the name.
  • Param tag is written within the applet tag in comment section.
  • When applet is loading the getParameter() method is used inside the init() method to access the parameters of param tag.
  • The parameters are in string type, we need to typecast them if values are other than string type.
  • We can write any number of param tags inside applet tag get parameters of different type.

Syntax

/* <applet code="AppletName.class" width=300 height=300>
    <param name="param1" value="value1">
    <param name="param2" value ="value2">
    ...
    ...
</applet> */

Example

Program to display message using param tag

/* <applet code="Test.class" width=300 height=300>
    <param name="param1" value="Hello. I'm Applet">
</applet> */

import java.awt.*;
import java.applet.*;

public class Test extends Applet
{
    String s=null;
    public void init()
    {
	s = getParameter("val");
    }
    public void paint(Graphics g)
    {
	g.drawString(s, 15, 140);
    }
}

Output

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