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48¡¢±à³ÌÌâ: дһ¸öSingleton³öÀ´¡£
SingletonģʽÖ÷Òª×÷ÓÃÊDZ£Ö¤ÔÚJavaÓ¦ÓóÌÐòÖУ¬Ò»¸öÀàClassÖ»ÓÐÒ»¸öʵÀý´æÔÚ¡£
Ò»°ãSingletonģʽͨ³£Óм¸ÖÖÖÖÐÎʽ:
µÚÒ»ÖÖÐÎʽ: ¶¨ÒåÒ»¸öÀ࣬ËüµÄ¹¹Ô캯ÊýΪprivateµÄ£¬ËüÓÐÒ»¸östaticµÄprivateµÄ¸ÃÀà±äÁ¿£¬ÔÚÀà³õʼ»¯Ê±ÊµÀý»°£¬Í¨¹ýÒ»¸öpublicµÄgetInstance·½·¨»ñÈ¡¶ÔËüµÄÒýÓÃ,¼Ì¶øµ÷ÓÃÆäÖеķ½·¨¡£
public class Singleton {
private Singleton(){}
//ÔÚ×Ô¼ºÄÚ²¿¶¨Òå×Ô¼ºÒ»¸öʵÀý£¬ÊDz»ÊǺÜÆæ¹Ö£¿
//×¢ÒâÕâÊÇprivate Ö»¹©ÄÚ²¿µ÷ÓÃ
private static Singleton instance = new Singleton();
//ÕâÀïÌṩÁËÒ»¸ö¹©Íⲿ·ÃÎʱ¾classµÄ¾²Ì¬·½·¨£¬¿ÉÒÔÖ±½Ó·ÃÎÊ
public static Singleton getInstance() {
return instance;
}
}
µÚ¶þÖÖÐÎʽ:
public class Singleton {
private static Singleton instance = null;
public static synchronized Singleton getInstance() {
//Õâ¸ö·½·¨±ÈÉÏÃæÓÐËù¸Ä½ø£¬²»ÓÃÿ´Î¶¼½øÐÐÉú³É¶ÔÏó£¬Ö»ÊǵÚÒ»´Î
//ʹÓÃʱÉú³ÉʵÀý£¬Ìá¸ßÁËЧÂÊ£¡
if (instance==null)
instance£½new Singleton();
return instance; ¡¡¡¡}
}
Ñ¡ÔñÅÅÐò
public static void main(String[] args){
int[]ary={8,6,3,5,2,1};
ary=selectionSort(ary);
String s=Arrays.toString(ary);
System.out.print(s);
}
public static int[] selectionSort(int[] ary){
for(int i=0;i
for(int j=i+1;j
if(ary[i]>ary[j]){
int temp=ary[i];
ary[i]=ary[j];
ary[j]=temp;
}
}
}
return ary;
}
ðÅÝÅÅÐò
for(int i=0;i
for(int j=0;j
if(ary[j]>ary[j+1]){
int temp=ary[j];
ary[j]=ary[j+1];
ary[j+1]=temp;
}
}
}
return ary;
ÓöþÖØÑ»·ÊµÏÖ£¬ÍâÑ»·±äÁ¿ÉèΪi£¬ÄÚÑ»·±äÁ¿ÉèΪj¡£ÍâÑ»·Öظ´9´Î£¬ÄÚÑ»·ÒÀ´ÎÖظ´9£¬8£¬¡£¬1´Î¡£Ã¿´Î½øÐбȽϵÄÁ½¸öÔªËض¼ÊÇÓëÄÚÑ»·jÓйصģ¬ËüÃÇ¿ÉÒÔ·Ö±ðÓÃa[j]ºÍa[j+1]±êʶ£¬iµÄÖµÒÀ´ÎΪ1,2,¡,9£¬¶ÔÓÚÿһ¸öi, jµÄÖµÒÀ´ÎΪ1,2,¡10-i¡£
²åÈëÅÅÐò
for(int i=1;i
int temp=ary[i];
int j;
for(j=i-1;j>=0;j¨C){
if(temp
ary[j+1]=ary[j];
}else{
break;
}
}
ary[j+1]=temp;
}
return ary;
´òÂÒÅÅÐò
import java.util.HashSet;
import java.util.Iterator;
import java,util.Set;
public class Iterator overSetDemo{
public static void main(String[] args){
Set set=new HashSet();
set.add(¡°D¡±);
set.add(¡°A¡±);
set.add(¡°C¡±);
set.add(¡°B¡±);
for(Iteractor i=set.iterator() : i.hasNext();){
String s=(String)i.next();
System.out.print(s+¡± ¡°);
}
}
}
//MySQL ÖеķÖÒ³²éѯʵÏÖ
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import week07.domain.Flight;
import week07.domain.News;
import week07.util.ConnectionUtils;
public class FlightDaoImplForMySQL {
/**
* ·ÖÒ³²éѯflight±íµÄËùÓÐÁеÄÊý¾Ý
*
* @param page
* µÚ¼¸Ò³
* @param rowsPerPages
* ÿҳÏÔʾÐÐÊý
* @param con
* Êý¾Ý¿âÁ¬½Ó
* @return ²éѯµ½µÄÊý¾ÝÒÔNews¶ÔÏóµÄÐÎʽ´æ´¢µ½ListÖзµ»Ø
* @throws Exception
*/
public List listPagesNewsDB(int page, int rowsPerPage,
Connection con) throws Exception {
int from = (page ¨C 1) * rowsPerPage;
String sql = ¡°select * from flight limit , ;¡±;
Connection conn = null;
PreparedStatement pStmt = null;
ResultSet rs = null;
Flight flight = null;
List flights = new ArrayList();
try {
conn = ConnectionUtils.openConnection();
pStmt = conn.prepareStatement(sql);
pStmt.setInt(1, from);
pStmt.setInt(2, rowsPerPage);
rs = pStmt.executeQuery();
while (rs.next()) {
String id = rs.getString(1);
String num = rs.getString(2);
flight = new Flight(id, num);
flights.add(flight);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
ConnectionUtils.clos