Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Java HashMapºÍTreeMapµÄÅÅÐòÎÊÌâ×ܽá

Map´æ´¢µÄÊÇkey->valueµÄÖµ¶Ô£¬keyµÄÖµÊÇΨһµÄ£¬¶øvalueµÄÖµ¿ÉÒÔÖØ¸´¡£Í¨³£Ê¹ÓõÄÊÇHashMap»òTreeMap£¬Èç¹û¿¼ÂÇÐÔÄÜ£¬Ê¹ÓÃHashMap¡£TreeMapʹÓúìºÚÊ÷ʵÏÖ£¬±£ÁôÓÐkeyֵ˳ÐòÐÔ£¬»á×Ô¶¯°´ÕÕkeyÖµÅÅÐò¡£
ĬÈÏÊǰ´ÕÕkeyÖµµÄÉýÐòÅÅÐò£¬keyÖµ±ØÐëʵÏÖ Comparator½Ó¿Ú¡£Èç¹ûÏ£Íû°´ÕÒÒ»¶¨¹æÔòÅÅÐò£¬ÔòÐèÒªÖØÐ¶¨Òåcompareº¯Êý¡£
Èç:
TreeMap hm = new TreeMap<String, String>(new Comparator() {
public int compare(Object o1, Object o2) {
//Èç¹ûÓпÕÖµ£¬Ö±½Ó·µ»Ø0
if (o1 == null || o2 == null)
return 0;

return String.valueOf(o1).compareTo(String.valueOf(o2));
}
});  
¶ÔÓÚ´¦ÀíÓÐÖÐÎÄÅÅÐòµÄÎÊÌâ 
TreeMap hm = new TreeMap<String, String>(new Comparator() {
public int compare(Object o1, Object o2) {
//Èç¹ûÓпÕÖµ£¬Ö±½Ó·µ»Ø0
if (o1 == null || o2 == null)
return 0;

CollationKey ck1 = collator.getCollationKey(String.valueOf(o1));
CollationKey ck2 = collator.getCollationKey(String.valueOf(o2));
return ck1.compareTo(ck2);
}
});
 
±¸×¢£º CollationKey£ºCollationKey ±íʾ×ñÊØÌØ¶¨ Collator ¶ÔÏó¹æÔòµÄ String¡£
±È½ÏÁ½¸öCollationKey ½«·µ»ØËüÃÇËù±íʾµÄ String µÄÏà¶Ô˳Ðò¡£Ê¹Óà CollationKey À´±È½Ï String ͨ³£±ÈʹÓà Collator.compare ¸ü¿ì¡£Òò´Ë£¬µ±±ØÐë¶à´Î±È½Ï String ʱ £¨ÀýÈ磬¶ÔÒ»¸ö String ÁÐ±í½øÐÐÅÅÐò£©£¬Ê¹Óà CollationKey »á¸ü¸ßЧ¡£
Èç¹ûÏë°´ÕÕvalueÅÅÐò»òÕßÊǶÔHashMapÖеÄkey»òvalueÅÅÐòÔò¿ÉÒÔÈçÏ£º
List<Map.Entry<String,Integer>> list = new ArrayList<Map.Entry<String,Integer>>(m.entrySet());
Collections.sort(list,new Comparator<Map.Entry<String,Integer>>(){
public int compare(Map.Entry<String,Integer> o1, Map.Entry<String,Integer> o2){
return o2.getValue()-o1.getValue();
}
});&


Ïà¹ØÎĵµ£º

sql 2005 ´æ´¢¹ý³Ì·ÖÒ³ java ´úÂë

 create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',         
@pagesize int output,--ÿҳÏÔʾ¼Ç¼ÌõÊý
@currentpage int output,--µÚ¼¸Ò³
@orderid nvarchar(50),--Ö÷¼üÅÅÐò
@sort int,--ÅÅÐò·½Ê½£¬1±íʾÉýÐò£¬0±íʾ½µÐòÅÅÁÐ ......

JavaλËãÊõÔËËã·û

 
1£©&£ºÓëÔËË㣬½«Á½¸öÊý·Ö±ðת»¯³É²¹Â룬Ȼºó½øÐÐÔËË㣨ȫ1µÃ1£¬ÓÐ0³ö0£©¡£
2£©£¡£º·ÇÔËË㣬½«Êý×Ö×ÔÉíÈ¡·´£¨×ª»¯³É²¹Â룬°´Î»È¡·´——1±ä0£¬0±ä1£©¡£
3£©<<£º×óÒÆÔËËã·û£¬½«Ä³¸öÊ®½øÖÆ×ª»»³É¶þ½øÖÆÖ®ºóĩβµÄn¸ö¶þ½øÖÆÊýÒÔ´ËÍù×óÒÆ¶¯£¬Òç³öµÄnλÓÃ0ÔÚĩβ²¹×ã¡£
4£©>>£º´ø·ûºÅÓÒÒÆÔË ......

ÓÃJavaдµÄMy SQL²Ù×÷·â×°Àà

Kagula
2009-11-17
 
¹Ø¼ü´Ê
    Java My SQL
 
¸ÅÒª£º
    ¶ÔMy SQL²Ù×÷·â×°µÄJavaÔ´ÂëʾÀý¡£
 
ÒªÇó»·¾³£º
    J2SE1.5 + Eclipse3.4.2
 
ÕýÎÄ£º
Ïȵ½ÍøÉÏÏÂÔØmysql-connector-java-5.0.8-bin.jar£¬²¢°ÑËü·Åµ½ÄãµÄJava ProjectµÄUser Lib ......

Java»æÍ¼

ÏÂÃæÊÇÎÒÈÏΪÕýÈ·µÄ×ö·¨£¨½áºÏ×Ô¼ºµÄ¾­ÑéдµÄ£¬Èç¹û²»ÕýÈ·£¬Çë´ó¼ÒÖ¸Õý£©£º
ÎҵĻæÍ¼¿Ø¼þÊÇJPanel£¬
³öÏÖ¹ö¶¯ÌõµÄǰÌᣬ±ØÐëÈûæÍ¼¿Ø¼þ·ÅÔÚJScrollPaneÉÏ£¬
¶ÔÓÚJScrollPaneµÄLayout£¬Ã»ÓÐÌØÊâÒªÇó£¬ÏÂÃæÕâÑù¼´¿É£º
jScrollPane1.setViewportView(jPanel1);
È»ºó£¬ÁíÍâά³ÖÒ»¸öBufferedImage£¨¼ÙÉè½Ðimage1£©£¬¸÷ÖÖÍ¼Ï ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ