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that code was an example of how to handle threads in Swing such that ur GUI doesn't become unresponsive.
Do not create swing gui in main thread.
Do not make a function call do a lot of work on...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** Resolve the unresponsive UI problem by running the compute-intensive task
in this own thread, which yields control to...