Applet Not Showing in Web

The program was compiled and runs in Eclipse. When I try to add the <APPLET> tag into the HTML file, the applet doesn't show. It's just one white box, with a red X, and a grey boarder.

HTML code:

Is there some program that you must have to show the applets?

It looks like you HTML is correct. Can you show the Java code too?

import javax.swing.*;
import BreezySwing.*;

public class ConvertWithGUI extends GBApplet {
	
	//Declare variables for the window objects.
	private JLabel fahrenheitLabel, celsiusLabel;
	private DoubleField fahrenheitField, celsiusField;
	private JButton fahrenheitButton, celsiusButton;
	
	//Init method - works like a constructor
	public void init(){
		//Instantiate and add window objects to the window
		fahrenheitLabel	      = addLabel	("Fahrenheit"	,1,1,1,1);
		celsiusLabel		= addLabel	  ("Celsius"	    ,1,2,1,1);
		
		fahrenheitField			= addDoubleField	(32.0				,2,1,1,1);
		celsiusField			= addDoubleField	(0.0				,2,2,1,1);
		fahrenheitButton		= addButton			(">>>"				,3,1,1,1);
		celsiusButton			= addButton			("<<<"				,3,2,1,1);
	}
	
	//Respond to button click events
	public void buttonClicked (JButton buttonObj){
		//Local variables
		Thermometer thermo = new Thermometer();
		
		//Determine which button was clicked
		if (buttonObj == fahrenheitButton){
			
			//Convert from Fahrenheit to Celsius
			thermo.setFahrenheit(fahrenheitField.getNumber());
			celsiusField.setNumber(thermo.getCelsius());
		}else{
			
			//Convert from Celsius to Fahrenheit
			thermo.setCelsius(celsiusField.getNumber());
			fahrenheitField.setNumber(thermo.getFahrenheit());
		}
	}
	//No method neccessary.
}

Then the thermometer class:

All of this runs in Eclipse.

Perhaps it's because when I try to open the ConvertWithGUI.class from My Computer it comes up with the message, "Java Virtual Machine Launcher: Failed to load Main-Class manifest attribute from C:\..."

I can't compile your program without the Thermometer class but I'm think I know what is going on. Your HTML only references your one class. But you're really dependent on your Thermometer class and the BreezySwing.jar file. The easiest (and that is a relative term) to handle this is to package all of your code in a single Jar file. There is an extensive Java Applet Tutorial on the Sun site that goes into this at least somewhat. It is a bit of a pain though.

Let us know if you get stuck.