ä½ æ¯å¦å·²ç»å¯¹æ¯æ¬¡ä»Mapä¸åå¾å
³é®åç¶åååå¾ç¸åºçå¼æè§åå¦ï¼ä½¿ç¨Map.Entryç±»ï¼ä½ å¯ä»¥å¾å°å¨åä¸æ¶é´å¾å°ææçä¿¡æ¯ãæ åçMap访é®æ¹æ³å¦ä¸ï¼
Set keys = map.keySet( );
if(keys != null) {
Iterator iterator = keys.iterator( );
while(iterator.hasNext( )) {
Object key = iterator.next( );
Object value = map.get(key);
;....
;}
}
ç¶åï¼è¿ä¸ªæ¹æ³æä¸ä¸ªé®é¢ãä»Mapä¸åå¾å
³é®åä¹åï¼æ们å¿
é¡»æ¯æ¬¡éå¤è¿åå°Mapä¸åå¾ç¸å¯¹çå¼ï¼è¿æ¯å¾ç¹çåè´¹æ¶çã
幸è¿çæ¯ï¼è¿éæä¸ä¸ªæ´å ç®åçéå¾ãMapç±»æä¾äºä¸ä¸ªç§°ä¸ºentrySet()çæ¹æ³ï¼è¿ä¸ªæ¹æ³è¿åä¸ä¸ªMap.Entryå®ä¾ååç对象éã æ¥çï¼Map.Entryç±»æä¾äºä¸ä¸ªgetKey()æ¹æ³åä¸ä¸ªgetValue()æ¹æ³ï¼å æ¤ï¼ä¸é¢ç代ç å¯ä»¥è¢«ç»ç»å¾æ´ç¬¦åé»è¾ã举ä¾å¦ä¸ï¼
Set entries = map.entrySet( );
if(entries != null) {
Iterator iterator = entries.iterator( );
while(iterator.hasNext( )) {
Map.Entry entry =iterator.next( );
Object key = entry.getKey( );
Object value = entry.getValue();
;....
}
}
尽管å¢å äºä¸è¡ä»£ç ï¼æ们å´çç¥äºè®¸å¤å¯¹Mapä¸å¿
è¦çâgetâè°ç¨ãåæ¶ï¼æä¾ç»å¼å人åä¸ä¸ªåæ¶ä¿æäºå
³é®ååå
¶å¯¹åºçå¼çç±»ãMap.Entryåæ¶ä¹æä¾äºä¸ä¸ªsetValueï¼ï¼æ¹æ³ï¼ç¨åºåå¯ä»¥ä½¿ç¨å®ä¿®æ¹mapéé¢çå¼ã
Hashtableå
é¨æåçæ¹å¼æ¯æ£åæå¸ï¼æ以å½è¾åºä¿¡æ¯æ¶ä¼æ¯æ åºçã为äºè½ä¿è¯è¾åºçæ°æ®æç
§é¡ºåºæåï¼ä¸è¦æ¸´æç¨javaèªå¸¦çå½æ°æ¥å¯¹ Hashtable对象è¿è¡è°æ´å¤çãå½æ们è·åHashtableéçKEYåVALUEæ¶ï¼ä¸è¬é½è¿è¡äºMap.Entryç±»æ¥è½¬æ¢ï¼å¥½ï¼ç°å¨å°±ç¨è¿ä¸ªç±»æ¥ä½æç« ï¼æå
·ä½åäºä¸ä¸ªæ¹æ³ã
代ç ï¼
/**
*
æ¹æ³å称ï¼getSortedHashtable
*
åæ°ï¼Hashtable h å¼å
¥è¢«å¤ççæ£å表
*
æè¿°ï¼å°å¼å
¥çhashtable.entrySetè¿è¡æåºï¼å¹¶è¿å
*/
public static Map.Entry[] getSortedHashtable(Hashtable h){
Set set = h.entrySet();
Map.Entry[] entries = (Map.Entry[])set.toArray(new Map.Entry[set.size()]);
Arrays.sort(entries,new Comparator(){
public int compare(Object arg0, Object arg1) {
Object key1 = ((Map.Entry)arg0).getKey();
Object key2 = ((Map.Entry)arg1).getKey();
return ((Comparable)key1).compareTo(key2);
}
});
return entries;
}
è°ç¨è¿ä¸ªæ¹æ³ï¼
Map.Entry[] set = getSortedHashtable(t);
//perportyTable
for (int i=0;i<set.length;i++){
System.out.println(set[i].getKey().toString());
System.out.println(set[i].getValue().toString());
}
温馨提示:答案为网友推荐,仅供参考