Where does a Java applet start?

For an applet, the main class is the one referred to in the <applet> tag of the HTML file, e.g.,

<applet code=MyClass width = 300 height=300>

</applet>

As we shall see later, a constructor is the method that is executed when an instance of a class is created. The constructor method always has the same identifier (name) as the class itself. So the first statement to be executed for the applet MyClass will be the first statement of the constructor method MyClass. 

Example:

The following applet will display a message on the screen.

//AppletGreetings.java

import java.awt.*;

import java.applet.Applet;

public class AppletGreetings extends Applet {

    public void paint (Graphics g){

        g.drawString(" Welcome to CMT4120", 50,50);

    }

}
 
 

You first compile the AppletGreetings.java using TextPad:
 
 

The HTML file is:

<applet code="AppletGreetings.class" width=300 height=50>

</applet>

You can then run the HTML file from TextPad using clicking Tools and selecting Run Java Applet.