Events
Handle events
Two types

The two types of Java events

Two types of events exist in Java: semantic events and low-level events.
A semantic event is related to a specific component such as clicking a button or selecting an item from a list.
Low-level events are less specific, like clicking a mouse button, pressing a key on the keyboard, or closing a window.
Most events and listeners are stored in the java.awt.event package, but some of the newer events and listeners are stored in the javax.swing.event package.
Some user actions create more than one event. You can use listeners to respond to any of them.

Semantic events

Action	Event object	Listener interface
Button clicked	ActionEvent	ActionListener
Combo box item selected	ActionEvent ItemEvent	ActionListener ItemListener
List item selected	ListSelectionEvent	ListSelectionListener
Text component changed	DocumentEvent	DocumentListener
Radio button selected	ActionEvent	ActionListener
	ItemEvent	ItemListener
Check box selected	ActionEvent ItemEvent	ActionListener ItemListener
Scroll bar repositioned	AdjustmentEvent	AdjustmentListener

Low-level events