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1.       ΪʲôҪÖƶ©±àÂë¹æ·¶
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2.       Îļþ×éÖ¯(File Organization)
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2.1  ¿ªÍ·×¢ÊÍ(Beginning Comments)
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/*
* Classname
*
* Version information
*
* Date
*
* Copyright notice
*/
2.2  °üºÍÒýÈëÓï¾ä(Package and Import Statements)
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package java.awt;
import java.awt.peer.CanvasPeer;
2.3  Àà(Class)
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/**
 * A class representing a set of packet and byte counters
 * It is observable to allow it to be watched, but only
 * reports changes when the current set is complete
 */
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public class CounterSet extends Observable implements Cloneable{}
2.4  ÀàµÄ³ÉÔ±±äÁ¿(Class Fields)
/**
 * Packet counters
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protected int[] packets;
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