Java: Summary: Classes, Interfaces
Packages
package package-name;
Class Definition
A class definition prototype:visibility
class class-name
[extends parent-class]
[implements interface-name...] { class-body }
| name | Meaning |
| visibility | public -- visible to everyone.
private -- visible only in this class.
protected -- visible in this class and all subclasses.
The default visibility is package visibility -- everyone in the this package can see it. |
| parent-class | This is the name of the parent class of this class.
The default parent class is Object.
|
| interface-name | For each interface that is implemented, this class must define all methods in that interface. |
class Node {
int data;
Node next;
// methods
}
import Statement
import import java.awt.*; // for a graphic drawing import java.awt.event.* // for events and listeners import javax.swing.*; // for more GUI components import javax.swing.event.*; // more listeners
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