Effective Java ѧϰ±Ê¼Ç (6)
¼°Ê±Ïû³ý²»Ê¹ÓõĶÔÏóµÄÒýÓÃ, ÀíÂÛÉÏ, ´øÓÐÄÚ´æ¹ÜÀíµÄÓïÑÔÊDz»´æÔÚÄÚ´æÐ¹Â©µÄ, µ«ÊÇÈç¹û¶Ô¶ÔÏóµÄ²Ù×÷²»µ±,Ò²ÊÇ¿ÉÄÜ»áÔì³ÉÄÚ´æÐ¹Â©. ÈçÓÐÒ»¸östack, Æäpopº¯ÊýÈçÏÂ. public Object pop() { if( Element.length() == 0) return null; return Element[size—]; } ÕâÑùµÄ´úÂë³õ¿´ºÃÏñûÓÐʲôÎÊÌâ, µ±Õ»Ôö¼ÓÔÙ¼õÉÙºó, ÔÀ´µÄÊý×éÖÐÈÔÈ»´æÔÚ±»POPµÄÄǸö¶ÔÏóµÄÒýÓÃ! ÕýÈ·´ð°¸Ó¦¸ÃÊÇ: public Object pop() { if( Element.length() == 0) return null; Object ele = Element[—size]; Element[size] =null; return ele; } È»¶øÊµ¼ÊÉÏ,ÎÒÃDz»ÓÃÔÚ³ÌÐòÖÐдÂúÀàËÆXXX=nullµÄÇé¿ö, ÀàËÆÕâÑùµÄ´¦ÀíÓ¦¸ÃÊÇÀýÍâµÄÉÙÊý×ö·¨¶ø²»ÄÜ¿´³É³£¹æ×ö·¨, ·ñÔò³ÌÐòµÄ½á¹¹¾Í²»¹»ÇåÎú. Ò»°ã˵À´,Ö»Óе±Ò»¸öÀà×Ô¼º¹ÜÀíÄÚ´æÊ±,²ÅҪСÐÄÄÚ´æÐ¹Â©. »¹Á½¸öµØ·½,Ò»¸öÊÇ»º´æ, ±»»º´æµÄÎïÌå¾³£±»ÒÅÍü. »¹ÓоÍÊÇlistenerºÍcallbackµÄº¯Êý, ¾³£ÊÇ×¢²áºó, ÔÚ²»Ê¹ÓÃÁË,Íü¼ÇÁË"derigster¡±, µ¼ÖÂÕâ¿éÏà¹ØµÄÄÚ´æ²»ÎÞÇå³ý
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Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year); //year Ϊ int
time.set(Calendar.MONTH,i-1);//×¢Òâ,Calendar¶ÔÏóĬÈÏÒ»ÔÂΪ0
int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);/ ......
Here is a simple library to query Google Maps with the following features:
geocode addresses to their geographic coordinates
retrieve static images with given custom size, format and zoom
To see a live sample of this API, you can check here: Java ME Google Maps API sample MIDlet
Contents
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int i = 10;
¸Ã±í´ïʽµÄº¬ÒåÊǽ«Ò»¸ö×ÖÃæÁ¿£¨literal£©10¸³Öµ¸øÒ»¸öÀàÐÍΪintÐ͵ıäÁ¿£¬±äÁ¿ÃûΪi¡£ÕâÊÇÒ»¸öΪ»ù±¾Êý¾ÝÀàÐ͵ıäÁ¿¸³ÖµµÄÀý×Ó£¬Ëü±í´ïÁËÒ»¸ö·Ç³£ÆÓËØµÄÐÅÏ¢£¬ÄǾÍÊDZäÁ¿iµÄֵΪ10¡£
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ÓÐʱºòÎÒÃÅÐèÒª°ÑEXCEL±í¸ñÖеÄÊý¾Ýת»»³ÉXML¸ñʽ ÕâÐèÒªÓõ½JXL(·ÖÎöEXCEL)°üºÍJDOM°ü(¹¹³ÉXML)
import java.io.*;
import jxl.*;
import org.jdom.Element;
import org.jdom.Document;
import org.jdom.output.XMLOutputter;
/**
*
* @author guo
*/
public class EtoX {
  ......
public class select {
public List XiuGai_select(String keyword){
List list=new ArrayList();
Connection conn = null;
Statement stmt = null;
String sql=null;
ResultSet res = null;
get ......