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We normally think of events as user-driven actions. But the mere passage of time is an event that Swing components can observe--all without the use of additional threads.

Java provides the javax.swing.Timer object--something of an ‘egg timer’ that allows one to have an event fired periodically without user interaction:

Timer t = new Timer(500, this);

t.start();

Possible Solution: Use Timers

delay

Event handler

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