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     HashSetÀàÔÚjava.util°üÖÐ
     A.¹¹Ôì·½·¨£ºHashSet()
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          public boolean add(Object o)£ºÏò¼¯ºÏÖÐÌí¼ÓÖ¸¶¨ÔªËØo
          public boolean addAll(HashSet set)£º½«µ±Ç°¼¯ºÏºÍ²ÎÊýÖ¸¶¨µÄ¼¯ºÏsetÇó²¢ÔËË㣬ʹµÃµ±Ç°¼¯ºÏ³ÉΪÁ½¸ö¼¯ºÏµÄ²¢¼¯
          public boolean retainAll(HashSet set)£º½«µ±Ç°¼¯ºÏºÍ²ÎÊýÖ¸¶¨µÄ¼¯ºÏsetÇó½»ÔËË㣬ʹµÃµ±Ç°¼¯ºÏ³ÉΪÁ½¸ö¼¯ºÏµÄ½»¼¯
          public boolean removeAll(HashSet set)£º½«µ±Ç°¼¯ºÏºÍ²ÎÊýÖ¸¶¨µÄ¼¯ºÏsetÇó²îÔËË㣬ʹµÃµ±Ç°¼¯ºÏ³ÉΪÁ½¸ö¼¯ºÏµÄ²î¼¯       
          public void clear()£ºÇå¿Õ¼¯ºÏ
          public boolean contains(Object o)£ºÅжϲÎÊýoÖ¸¶¨µÄÔªËØÊÇ·ñÊôÓÚ¼¯ºÏ
          public boolean isEmpty()£ºÅжϼ¯ºÏÊÇ·ñΪ¿Õ
          public boolean remove(Object o)£º´Ó¼¯ºÏÖÐÒƳýÔªËØo
          public int size()£º·µ»Ø¼¯ºÏÖÐÔªËصĸöÊý
          public Object[] toArray()£º½«¼¯ºÏµÄÔªËØ´æ·Åµ½Êý×éÖУ¬²¢·µ»ØÕâ¸öÊý×é
          public boolean containsAll(HashSet set)£ºÅжϵ±Ç°¼¯ºÏÊÇ·ñ°üº¬²ÎÊýsetÖ¸¶¨µÄ¼¯ºÏ
          public Object clone()£ºµÃµ½µ±Ç°¼¯ºÏµÄÒ»¸ö¿Ë¡¶ÔÏ󣬸öÔÏóÖÐÔªËصĸı䲻»áÓ°Ïìµ½µ±Ç°¼¯ºÏÖÐÔªËØ£¬·´Ö®ÒàÈ»
     C.¿ÉÒÔʹÓõü´úÆ÷Iterator±éÀú¼¯ºÏÖеÄÿ¸öÔªËØ(Óйصü´úÆ÷IteratorµÄÓ÷¨¿É²ÎÕÕÎÄÕ“IteratorÀàµÄÓ÷¨”)
2.É¢ÁбíHashtable
    HashtableÀàÔÚjava.util°üÖÐ
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import java.security.*;
import java.io.*;
import
java.util.*;
import java.security.*;
import java.security.cert.*;
import sun.security.x509.*
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
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