Java Never Ends - Java - page 1030

Display 19.1 Nonresponsive GUI (part 3 of 3)

Resulting GUI (When started)

Resulting GUI (While drawing circles)

If you click the close-window button
while the circles are being drawn,
the window will not close until all
the circles are drawn.

Resulting GUI (After all circles are drawn)

can sometimes be handy even if you do not do any
multithreaded programming. The class

The method

Thread.sleep

is in the package and so

Thread java.lang

requires no import statement.
The method

can throw an , which is a

Thread.sleep InterruptedException

checked exception—that is, it must be either caught in a block or declared in a

catch

in this topic, leaving it for
more advanced topics on multithreaded programming, but it has to do with one thread
interrupting another thread. We will simply note that an

clause. We do not discuss

throws InterruptedException

may

InterruptedException