Interfaces - Survey - Musings

Tutorial 1 on interfaces (pdf), Abstract, new Interfaces, Event Handling
Tutorial 2 on interfaces (pdf), Part 2 - Vector class, sorting and collections
MyIF Development

Survey.

Let me begin by listing some of the interfaces available in the JDK, the methods they define, and a few comments. The basic Java class libraries define over 3000 classes, and hundreds of interfaces, so this list is far from compete.

Interface	methods	Package	Comments
`ActionListener`	`void actionPerformed(ActionEvent e)`	`java.awt.event`	Covers most actions in the AWT
`KeyListener`	`void keyPressed(KeyEvent e) void keyReleased(KeyEvent e) void keyTyped(KeyEvent e)`	`java.awt.event`	Covers key presses, bypasses command line editor
`MouseListener`	`void mouseClicked(MouseEvent e) void mouseEntered(MouseEvent e) void mouseExited(MouseEvent e) void mousePressed(MouseEvent e) void mouseReleased(MouseEvent e)`	`java.awt.event`	Covers click-oriented mouse event
`MouseMotionListener`	`void mouseDragged(MouseEvent e) void mouseMoved(MouseEvent e)`	`java.awt.event`	Covers mouse moving type events - use very short code here, otherwise application will really slow down.
`Comparable <T>`	`int compareTo(T o)`	`java.lang`	natural ordering for class, see Comparator below
`Comparator <T>`	`int compare(T t1, T t2) boolean equals(T t)`	`java.util`	A class can have more than one of these. Access to T fields can be gained using t, t1 and t2 references. An instance of this class can be used effectively as a parameter to sort in the packages Arrays and Collections
`Enumeration`	`boolean hasMoreElements() E nextElement()`	`java.util`	Use: // v is an enumberable class, such as Vector for (Enumeration e = v.elements() ; e.hasMoreElements() ;) { System.out.println(e.nextElement()); } // end for each element
`Iterable`	`Iterator iterator()`	`java.lang`	variety of subinterfaces, Collections classes and others use this
`Iterator`	`boolean hasNext() E next() void remove()`	`java.util`	similar to enumeration, but adds remove()
`Runnable`	`void run()`	`java.lang`	Place where a thread starts
`EventListener`	`(none)`	`java.util`	LOTS of subinterfaces and implementing classes
`Paint`	`PaintContext createContext(ColorModel cm, Rectangle deviceBounds, Rectangle2D userBounds, AffineTransform xform, RenderingHints hints)`	`java.awt`	NOT the paint (Graphics) method used in GUI's
`Serializable`	`void writeObject(java.io.ObjectOutputStream out) void readObject(java.io.ObjectInputStream in)`	`java.io`	methods are optional, uses serialVersionUID VERY Brittle

Complete set of interfaces in a few packages:

Package	Interfaces	Package	Interfaces	Package	Interfaces
java.util	Collection Comparator Deque Enumeration EventListener Formattable Iterator List ListIterator Map Map.Entry NavigableMap NavigableSet Observer Queue RandomAccess Set SortedMap SortedSet	java.lang	Appendable AutoCloseable CharSequence Cloneable Comparable Iterable Readable Runnable Thread.UncaughtExceptionHandler	java.io	Closeable DataInput DataOutput Externalizable FileFilter FilenameFilter Flushable ObjectInput ObjectInputValidation ObjectOutput ObjectStreamConstants Serializable
java.awt	ActiveEvent Adjustable Composite CompositeContext ItemSelectable KeyEventDispatcher KeyEventPostProcessor LayoutManager LayoutManager2 MenuContainer Paint PaintContext PrintGraphics SecondaryLoop Shape Stroke Transparency	java.awt.event	ActionListener AdjustmentListener AWTEventListener ComponentListener ContainerListener FocusListener HierarchyBoundsListener HierarchyListener InputMethodListener ItemListener KeyListener MouseListener MouseMotionListener MouseWheelListener TextListener WindowFocusListener WindowListener WindowStateListener

ND.