Event-Handling model ● Event-handling model O Three parts ● Event source GUi component with which user interacts ● Event object Encapsulates information about event that occurred ● Event listener Receives event object when notified, then responds O Programmer must perform two tasks o Register event listener for event source Implement event-handling method (event handler Introduction to Java Programming, revised by Dai-kaiyuLiang,Introduction to Java Programming,revised by Dai-kaiyu 8 Event-Handling Model ⚫ Event-handling model Three parts ⚫Event source • GUI component with which user interacts ⚫Event object • Encapsulates information about event that occurred ⚫Event listener • Receives event object when notified, then responds Programmer must perform two tasks ⚫Register event listener for event source ⚫Implement event-handling method (event handler)