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i just need to explain how all the codes work in this application.

for example
// import the classes of the abstract windows toolkit and swing to enable us to use
//components like buttons...

are the changes i made what you asked for?

CAN SOMEONE PLEASE SHOW ME HOW THIS PIEVE OF CODING WORKS AND WHAT IT DOES?
ASAP PLEASE !!!
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class CheckLibrary...