Event handling using applet class and FocusListener interface

You can see all event methods in java.awt.Event class and java.awt.event.FocusListener is an Interface that includes methods named focusGained() and focusLost() and both takes FocusEvent as an argument.
javap java.awt.event.FocusListener(type over command prompt)

echo %path%(type over command prompt to check path)

Step 1:Create a java source file with name SecondEvent.java that is name of java class and it is mandatory that class name and file name must be same.
Applet class must be public.

In java source file commented applet code will not be compile by java compiler but will executed by AppletViewer.
In command addFocusListener(this) "this" keyword refers as object of current class. we can also write "new SecondEvent()" at place of "this" keyword.

Step 2: Run cmd(command prompt) and compile java source file, SecondEvent.class file'll be build.
then give appletviewer command and applet will pop out.

Download Code Link 1
Download Code Link 2

output:

Focus Gained

Focus Lost