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General <strong>Java</strong> Questions III<br />
specific to traversing a Hashtable).<br />
If this doesn't help, maybe you could clear up what you mean by Enumeration having<br />
defined methods.<br />
--<br />
Eric<br />
Q: can anyone provide an example on how to use clone() and clonable<br />
interface?<br />
Answer:<br />
//Class Point uses default clone implementation that returns<br />
//shallow copy of Point (which is sufficient in this case).<br />
class Point implements Cloneable {<br />
int x, y;<br />
}<br />
class ImmutableRectangle {<br />
private Point lowerLeft = new Point();<br />
private Point upperRight = new Point();<br />
public Point getLowerLeftPoint() {<br />
try {<br />
return lowerLeft.clone();<br />
}<br />
catch(CloneNotSupportedException e) {<br />
//shouldn't occur since Point is cloneable<br />
throw new InternalError();<br />
}<br />
}<br />
}<br />
we don't want Rectangle points to be changed outside its class. the best<br />
way would be to create a copy of Point object and pass it.<br />
i5mast<br />
MVP for <strong>Java</strong> 2<br />
http://www.brainbench.com<br />
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