??xml version="1.0" encoding="utf-8" standalone="yes"?>蜜臀久久99精品久久一区二区,久久精品视频一,91精品国产综合久久久蜜臀图片http://www.aygfsteel.com/shanrenxj/zh-cnThu, 19 Jun 2025 13:07:11 GMTThu, 19 Jun 2025 13:07:11 GMT60用JDBCq接SQL数据库遇到的问题http://www.aygfsteel.com/shanrenxj/archive/2011/11/08/363246.htmlq鹰q鹰Tue, 08 Nov 2011 14:53:00 GMThttp://www.aygfsteel.com/shanrenxj/archive/2011/11/08/363246.htmlhttp://www.aygfsteel.com/shanrenxj/comments/363246.htmlhttp://www.aygfsteel.com/shanrenxj/archive/2011/11/08/363246.html#Feedback0http://www.aygfsteel.com/shanrenxj/comments/commentRss/363246.htmlhttp://www.aygfsteel.com/shanrenxj/services/trackbacks/363246.htmlJDBCq接数据?br />SQL2000需要三个jar包:(x)http://dl.dbank.com/c01lhhrw11
SQL2005需要一个jar包:(x)http://dl.dbank.com/c02tkdkmmy

加蝲驱动与得到连接的区别Q?br />

SQL2005的用Q?/span>Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection ct=DriverManager.getConnection("jdbc:sqlserver://127.0.0.1:1433;d atabaseName=stdb","sa","sa");         

 

SQL2000的用Q?/span>Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");

Connection ct=DriverManager.getConnection("jdbc:microsoft:sqlserver://127.0.0.1:1433;d atabaseName=stdb","sa","sa");
常见问题
com.microsoft.sqlserver.jdbc.SQLServerException: C?nbsp; ?TCP/IP q接p|?java.net.ConnectException: Connection refused: connect 
ava qsql2005出现q个错误Ӟ首先查是否引用了sql 2005的包Q?nbsp;
W二步,看你的sql 2005是否开启了q程讉K权限Q具体设|如下:(x) 
q入“Microsoft SQL Server 2005 ”——“配置工具”——“SQL Server 外围应用配置?#8221; 
在进?#8220;MSSQLSERVER"——“DATABASE" Engine”——“q程q接” 
选择“本地q接和远E连?R)"——”同时使用tcp/ip和named pipes(B)" 
最后重启sql server 2005


q鹰 2011-11-08 22:53 发表评论
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Ҏ(gu)重蝲与方法覆盖(重写Q?/title><link>http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362883.html</link><dc:creator>q鹰</dc:creator><author>q鹰</author><pubDate>Sun, 06 Nov 2011 01:54:00 GMT</pubDate><guid>http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362883.html</guid><wfw:comment>http://www.aygfsteel.com/shanrenxj/comments/362883.html</wfw:comment><comments>http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362883.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/shanrenxj/comments/commentRss/362883.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/shanrenxj/services/trackbacks/362883.html</trackback:ping><description><![CDATA[<p align="left" style="text-align:left;line-height:18.0pt;"><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)重蝲</span></p> <p align="left" style="text-align:left;line-height:18.0pt;"><span style="font-size:12.0pt; font-family:宋体;">#</span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white"> Java</span></span><span style="font-family:宋体;color:black;background:white">?/span><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)重蝲是指一个类中有多个Ҏ(gu)h相同的名字,但参C同?/span></p> <p align="left" style="text-align:left;text-indent:5.25pt;line-height:18.0pt;"><span style="font-family:宋体;color:black;background:white">调用Ҏ(gu)旉过传递给它们的不同个数和cd的参数来区分具体使用哪个Ҏ(gu)</span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">, </span></span><span style="font-family:宋体;color:black;background:white">q?/span></p> <p align="left" style="text-align:left;text-indent:5.25pt;line-height:18.0pt;"><span style="font-family:宋体;color:black;background:white">是多态性?/span></p> <p align="left" style="margin-left:18.0pt;text-align:left; text-indent:-18.0pt;line-height:18.0pt;"><span style="font-size:12.0pt; font-family:宋体;">1. </span><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)名相?/span></p> <p align="left" style="margin-left:18.0pt;text-align:left; text-indent:-18.0pt;line-height:18.0pt;"><span style="font-family:"Arial","sans-serif";color:black;"><span>2.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)的参数类型,个数Q顺序至有一不?/span></p> <p align="left" style="margin-left:18.0pt;text-align:left; text-indent:-18.0pt;line-height:18.0pt;"><span style="font-family:"Arial","sans-serif";color:black;"><span>3.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)q回cd可以不同</span></p> <p align="left" style="margin-left:18.0pt;text-align:left; text-indent:-18.0pt;line-height:18.0pt;"><span style="font-family:"Arial","sans-serif";color:black;"><span>4.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)的修饰符可以不同</span></p> <p align="left" style="text-align:left;line-height:18.0pt;"> </p> <p align="left" style="text-align:left;line-height:18.0pt;"><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)覆盖Q重写)</span></p> <p align="left" style="text-align:left;line-height:18.0pt;"><span style="font-size:12.0pt; font-family:宋体;">#</span><span style="font-family:宋体;color:black;background:white">?/span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">Java</span></span><span style="font-family:宋体;color:black;background:white">中,子类可承父cM的方法,而不需要重新编写相同的Ҏ(gu)。但有时子类q不惛_不动地l承父类的方法,而是想作一定的修改Q这需要采用方法的重写?/span></p> <p align="left" style="margin-left:18.0pt;text-align:left; text-indent:-18.0pt;line-height:18.0pt;"><span style="font-size:12.0pt; font-family:宋体;">1. </span><span style="font-size:12.0pt;font-family:宋体;">Ҏ(gu)覆盖是子类有一个方法和父类的某个方法的<span style="color:red">名称</span>?span style="color:red">q回cd</span>?span style="color:red">参数</span>一P那么我们p子类的这个方法覆盖了父类的那个方法?/span></p> <p align="left" style="margin-left:18.0pt;text-align:left; text-indent:-18.0pt;line-height:18.0pt;"><span style="font-family:"Arial","sans-serif";color:black;"><span>2.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-family:宋体;color:black;">子类的方法的q回cdQ参敎ͼҎ(gu)名称要和父类的完全一_(d)否则~译出错?/span></p> <p align="left" style="margin-left:18.0pt;text-align:left; text-indent:-18.0pt;line-height:18.0pt;"><span style="font-family:"Arial","sans-serif";color:black;"><span>3.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-family:宋体;color:black;">子类Ҏ(gu)不能~小父类Ҏ(gu)的访问权限(子类Ҏ(gu)的修饰符定义得要比父cL法的修饰W的讉K范围大)</span></p><img src ="http://www.aygfsteel.com/shanrenxj/aggbug/362883.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/shanrenxj/" target="_blank">q鹰</a> 2011-11-06 09:54 <a href="http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362883.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>成员变量和局部变?/title><link>http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362882.html</link><dc:creator>q鹰</dc:creator><author>q鹰</author><pubDate>Sun, 06 Nov 2011 01:53:00 GMT</pubDate><guid>http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362882.html</guid><wfw:comment>http://www.aygfsteel.com/shanrenxj/comments/362882.html</wfw:comment><comments>http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362882.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/shanrenxj/comments/commentRss/362882.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/shanrenxj/services/trackbacks/362882.html</trackback:ping><description><![CDATA[<p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:宋体;color:black;">成员变量和局部变?/span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">1.</span><span style="font-family:宋体;color:black;">cM属性部分定义的变量UCؓ(f)成员变量Q方法体内定义的变量UCؓ(f)局部变量?/span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">2.</span><span style="font-family:宋体;color:black;">成员变量在整个类内都有效Q局部变量只在定义它的方法体内有效?/span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">3.</span><span style="font-family:宋体;color:black;">如果成员变量和局部变量的名字相同Q则在方法体里成员变量将被隐藏?/span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">Public class Person{</span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">              </span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">              int age; //</span><span style="font-family: 宋体;color:black;">成员变量</span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">              </span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">              String name; //</span><span style="font-family: 宋体;color:black;">成员变量</span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">                            </span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">              public Person(int age,String name)</span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">              {</span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">                     </span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">                     this.age=age;   //this.age</span><span style="font-family: 宋体;color:black;">中的</span><span style="font-family:"Arial","sans-serif";color:black;">age</span><span style="font-family:宋体;color:black;">为成员变量,</span><span style="font-family:"Arial","sans-serif";color:black;">age</span><span style="font-family:宋体;color:black;">为局部变?/span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">                     </span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">                     this.name=name;</span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;">              }</span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "> </p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif"; color:black;"><span>        </span></span><span style="font-family:宋体;color:black;">实例变量和类变量Q静态变量)以及(qing)cL?/span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; text-indent: -18pt; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"><span>1.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-family:宋体;color:black;">实例变量</span><span style="font-family:"Arial","sans-serif"; color:black;">+</span><span style="font-family:宋体;color:black;">cd?/span><span style="font-family:"Arial","sans-serif";color:black;">=</span><span style="font-family:宋体;color:black;">成员变量?/span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; text-indent: -18pt; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"><span>2.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-family:宋体;color:black;">cd量声明时要带?#8220;</span><span style="font-family: "Arial","sans-serif";color:black;">static</span><span style="font-family:宋体;color:black;">”关键字?/span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; text-indent: -18pt; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"><span>3.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-family:宋体;color:black;">实例变量使用时是被对象调用的Q即“对象?/span><strong><span style="font-family:"Arial","sans-serif";color:black;">.</span></strong><span style="font-family:宋体;color:black;">实例变量?#8221;Q?/span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:宋体;color:black;">cd量用时被类调用Q也可以是对象)Q即“cd</span><strong><span style="font-family:"Arial","sans-serif"; color:black;">.</span></strong><span style="font-family:宋体;color:black;">cd?#8221;Q?/span> <span style="font-family:宋体;color:black;">对象?/span><strong><span style="font-family:"Arial","sans-serif"; color:black;">.</span></strong> <span style="font-family:宋体;color:black;">cd量)?/span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; text-indent: -18pt; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"><span>4.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-family:宋体;color:black;">某个对象更改其实例变量,其他对象不受影响Q类变量改变Ӟ所有对象的q个cd量都被改变?/span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; text-indent: -18pt; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"><span>5.<span style="font:7.0pt "Times New Roman"">    </span></span></span><span style="font-family:宋体;color:black;">实例Ҏ(gu)既能对类变量操作Q用能对实例变量操作Q而类Ҏ(gu)只能对类变量q行操作?/span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">Public class Child{</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">        int age;</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"> <span>    </span>String name;</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">     static int total=0;</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"> public void joinGame(){</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">            System.out.println("</span><span style="font-family:宋体;color:black;">有一个小孩加q来?/span><span style="font-family:"Arial","sans-serif";color:black;">");</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">            total++;</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">     } </span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">}</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">public static void main(String []args)</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;"> {</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">Child ch1=new Child();</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">ch1.age=10;</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">ch1.name=”</span><span style="font-family:宋体;color:black;">小</span><span style="font-family:"Arial","sans-serif";color:black;">”;</span></p> <p align="left" style="font-family: Tahoma; margin-left: 59.25pt; text-align: left; line-height: 18pt; "><span style="font-family:"Arial","sans-serif";color:black;">System.out.println("</span><span style="font-family:宋体;color:black;">共有</span><span style="font-family:"Arial","sans-serif";color:black;">"+ch1<strong>.</strong>total); }</span></p> <p align="left" style="margin-left: 59.25pt; text-align: left; line-height: 18pt; "><br /></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-family:宋体;">静态代码块</span>static{...}</p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "> </p> <p align="left" style="font-family: Tahoma; text-align: left; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: #f0f0f0; background-position: initial initial; background-repeat: initial initial; "><span style="font-size:12.0pt;font-family:宋体;">首先静态代码块</span><span style="font-size:12.0pt;font-family:"Arial","sans-serif";">static{...}</span><span style="font-size:12.0pt; font-family:宋体;">是在c被装蝲的时候执行,且只执行一ơ;静态代码块是在内存中开辟的一块公共区域,cȝ多个实例׃n的区域,M该类的实例对该区域的操作都对所有所有该cȝ实例对该区域的操作都是生效的?/span></p> <p align="left" style="font-family: Tahoma; text-align: left; line-height: 18pt; "><span style="font-size:12.0pt; font-family:宋体;">static</span><span style="font-size:12.0pt;font-family:宋体;">代码块主要用在想在类加蝲的时候就初始化一些内容,如:(x)初始化数据库链接classforName("XXX"),</span></p><img src ="http://www.aygfsteel.com/shanrenxj/aggbug/362882.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/shanrenxj/" target="_blank">q鹰</a> 2011-11-06 09:53 <a href="http://www.aygfsteel.com/shanrenxj/archive/2011/11/06/362882.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>什么是是JAVA构造函?/title><link>http://www.aygfsteel.com/shanrenxj/archive/2011/11/05/362728.html</link><dc:creator>q鹰</dc:creator><author>q鹰</author><pubDate>Sat, 05 Nov 2011 01:59:00 GMT</pubDate><guid>http://www.aygfsteel.com/shanrenxj/archive/2011/11/05/362728.html</guid><wfw:comment>http://www.aygfsteel.com/shanrenxj/comments/362728.html</wfw:comment><comments>http://www.aygfsteel.com/shanrenxj/archive/2011/11/05/362728.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/shanrenxj/comments/commentRss/362728.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/shanrenxj/services/trackbacks/362728.html</trackback:ping><description><![CDATA[<p align="left" style="margin-top:22.5pt;margin-right:0cm; margin-bottom:15.0pt;margin-left:0cm;text-align:left;line-height:18.0pt;word-break:break-all"><strong><span style="font-size: 15pt; font-family: 微Y雅黑, sans-serif; color: black; ">什么是是JAVA构造函?/span></strong><strong><span style="font-family:"Arial","sans-serif";color:black;">  </span></strong></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span style="font-family:宋体;color:black;">每创Z个类的实例都d始化它的所有变量是乏味的。如果一个对象在被创建时完成了所有的初始工作Q将是简单的和简z的。因此,</span><span style="font-family:"Arial","sans-serif"; color:black;">Java</span><span style="font-family:宋体;color:black;">在类里提供了一个特D的成员函数Q叫做构造函敎ͼ</span><span style="font-family:"Arial","sans-serif"; color:black;">Constructor</span><span style="font-family:宋体;color:black;">Q?/span> <span style="font-family: "Arial","sans-serif";color:black;"><br /> </span><span style="font-family:宋体;color:black;">  一个构造函数是对象被创建时初始对象的成员函数。它h和它所在的cd全一L(fng)名字。一旦定义好一个构造函敎ͼ</span><span style="font-family:宋体;color:black;background:white">?/span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">new</span></span><span style="font-family:宋体;color:black;background:white">q算W一起用,</span><span style="font-family:宋体;color:black;">创徏对象时就?x)自动调用它。构造函数没有返回类型,即?/span><span style="font-family:"Arial","sans-serif";color:black;">void</span><span style="font-family:宋体;color:black;">cd也没有。这是因Z个类的构造函数的q回值的cd是q个cLw。构造函数的d是初始化一个对象的内部状态,所以用</span><span style="font-family:"Arial","sans-serif"; color:black;">new</span><span style="font-family:宋体;color:black;">操作W创Z个实例后Q立d?x)得C个清楚、可用的对象?/span> <span style="font-family: "Arial","sans-serif";color:black;"><br /> <br /> </span><span style="font-family:宋体;color:black;">构造方法是一U特D的Ҏ(gu)Q具有以下特炏V?/span> <span style="font-family:"Arial","sans-serif"; color:black;"><br /> </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">1</span><span style="font-family:宋体;color:black;">Q构造方法的Ҏ(gu)名必Mcd相同?/span> <span style="font-family:"Arial","sans-serif";color:black;"><br /> </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">2</span><span style="font-family:宋体;color:black;">Q构造方法没有返回类型,也不能定义ؓ(f)</span><span style=" font-family:"Arial","sans-serif";color:black;">void</span><span style="font-family:宋体;color:black;">Q在Ҏ(gu)名前面不声明Ҏ(gu)cd?/span> <span style="font-family:"Arial","sans-serif";color:black;"><br /> </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">3</span><span style="font-family:宋体;color:black;">Q构造方法的主要作用是完成对象的初始化工作,它能够把定义对象时的参数传给对象的域?/span> <span style="font-family:"Arial","sans-serif"; color:black;"><br /> </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">4</span><span style="font-family:宋体;color:black;">Q构造方法不能由~程人员调用Q而要pȝ调用?/span> </p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span style="font-family:宋体;color:black;">Q?/span><span style="font-family:"Arial","sans-serif"; color:black;">5</span><span style=" font-family:宋体;color:black;">Q?/span><span style="font-family:宋体;color:black;background:white">构造函C能被直接调用</span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">,</span></span><span style="font-family:宋体;color:black;background:white">必须通过</span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">new</span></span><span style="font-family:宋体;color:black;background:white">q算W在创徏对象时才?x)自动调用(卛_</span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">new</span></span><span style="font-family:宋体;color:black;background:white">的时候就开始执行构造函数里面的语句Q;而一般的Ҏ(gu)是在E序执行到它的时候被调用?/span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">.</span></span><span style="font-family:"Arial","sans-serif"; color:black;"><br /> </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">6</span><span style="font-family:宋体;color:black;">Q一个类可以定义多个构造方法,如果在定义类时没有定义构造方法,则编译系l会(x)自动插入一个无参数的默认构造器Q这个构造器不执行Q何代码?/span> <span style="font-family: "Arial","sans-serif";color:black;"><br /> </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">7</span><span style="font-family:宋体;color:black;">Q构造方法可以重载,以参数的个数Q类型,或排列顺序区分?/span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span style="font-family:宋体;color:black;">Q?/span><span style="font-family:"Arial","sans-serif"; color:black;">8</span><span style=" font-family:宋体;color:black;">Q?/span><span style="font-family:宋体;color:black;background:white">当定义一个类的时候,如果E序员不创徏构造函敎ͼ?/span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">Java</span></span><span style="font-family:宋体;color:black;background:white">~译器就?x)提供一个默认的不带参数的构造函数。创建对象时pȝ׃(x)自动调用q个默认的构造函数来创徏cȝ对象。如</span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">Public Class Person{</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">Int age;</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">String name;</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">//</span></span><span><span style="font-family:宋体;color:black;background: white">默认的构造函Cؓ(f)</span></span><span><span style="font-family:"Arial","sans-serif";color:black; background:white">(java</span></span><span><span style="font-family:宋体;color:black;background: white">~辑器会(x)自动生成?/span></span><span><span style="font-family:"Arial","sans-serif";color:black; background:white">)</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">   Public Person(){</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">}</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">Person p=new Person();</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">p.age=10;</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">p.name=”</span></span><span style="font-family:宋体;color:black;background:white">张三</span><span><span style=" font-family:"Arial","sans-serif";color:black;background:white">”;</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span><span style="font-family:"Arial","sans-serif"; color:black;background:white">}</span></span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; text-indent:24.0pt;line-height:18.75pt;"><strong><span style="font-family:"Arial","sans-serif";color:navy;">java </span></strong><strong><span style="font-family:宋体;color:navy;">构造函数的执行q程</span></strong></p> <p align="left" style="margin-bottom: 7.5pt; text-align: left; text-indent: 24pt; line-height: 18.75pt; "><span style="font-family:宋体;color:black;">cd始化时构造函数调用顺序:(x)</span><span style=" font-family:"Arial","sans-serif";color:black;"><br />   </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">1</span><span style="font-family:宋体;color:black;">Q初始化对象的存储空间ؓ(f)零或</span><span style="font-size:12.0pt;font-family: "Arial","sans-serif";color:black;">null</span><span style="font-family:宋体;color:black;">|</span><span style="font-family: "Arial","sans-serif";color:black;"><br />   </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">2</span><span style="font-family:宋体;color:black;">Q调用父cL造函敎ͼ</span><span style=" font-family:"Arial","sans-serif";color:black;"><br />   </span><span style="font-family:宋体;color:black;">Q?/span><span style=" font-family:"Arial","sans-serif";color:black;">3</span><span style="font-family:宋体;color:black;">Q按序分别调用cL员变量和实例成员变量的初始化表达式;</span><span style="font-family:"Arial","sans-serif";color:black;"><br /><p align="left" style="text-align:left;text-autospace:none"><strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">public</span></strong> <strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">class</span></strong><span style="font-size:10.0pt;font-family:"Courier New";color:black;"> Demo_1 {</span></p> <p align="left" style="text-align:left;text-autospace:none"> </p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">    </span><span style="font-size:10.0pt;font-family:"Courier New"; color:#3F5FBF;">/**</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:#3F5FBF;">     * </span><strong><span style="font-size:10.0pt;font-family:"Courier New";color:#7F9FBF;">@param</span></strong><span style="font-size:10.0pt; font-family:"Courier New";color:#3F5FBF;"> args</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:#3F5FBF;">     */</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">    </span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">    </span></p> <p align="left" style="text-align:left;text-autospace:none"> </p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">    </span><strong><span style="font-size:10.0pt;font-family:"Courier New";color:#7F0055;">public</span></strong> <strong><span style="font-size:10.0pt;font-family:"Courier New";color:#7F0055;">static</span></strong> <strong><span style="font-size:10.0pt;font-family:"Courier New";color:#7F0055;">void</span></strong><span style="font-size:10.0pt; font-family:"Courier New";color:black;"> main(String[] args){</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">     </span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">          </span><strong><span style="font-size:10.0pt;font-family:"Courier New";color:#7F0055;">new</span></strong><span style="font-size:10.0pt;font-family:"Courier New"; color:black;"> Money();</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">          </span><strong><span style="font-size:10.0pt;font-family:"Courier New";color:#7F0055;">new</span></strong><span style="font-size:10.0pt;font-family:"Courier New"; color:black;"> Dollar();</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">          </span><strong><span style="font-size:10.0pt;font-family:"Courier New";color:#7F0055;">new</span></strong><span style="font-size:10.0pt;font-family:"Courier New"; color:black;"> Rmb();</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">     </span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">    }</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">}</span></p> <p align="left" style="text-align:left;text-autospace:none"><strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">class</span></strong><span style="font-size:10.0pt;font-family:"Courier New";color:black;"> Money{</span></p> <p align="left" style="text-align:left;text-autospace:none"><strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">public</span></strong><span style="font-size:10.0pt;font-family:"Courier New";color:black;"> Money(){</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;"> System.</span><em><span style="font-size:10.0pt;font-family:"Courier New";color:#0000C0;">out</span></em><span style="font-size:10.0pt;font-family:"Courier New"; color:black;">.println(</span><span style="font-size:10.0pt;font-family:"Courier New";color:#2A00FF;">"Money is construct"</span><span style="font-size: 10.0pt;font-family:"Courier New";color:black;">);</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">}</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">}</span></p> <p align="left" style="text-align:left;text-autospace:none"><strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">class</span></strong><span style="font-size:10.0pt;font-family:"Courier New";color:black;"> Dollar{</span></p> <p align="left" style="text-align:left;text-autospace:none"><strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">public</span></strong><span style="font-size:10.0pt;font-family:"Courier New";color:black;"> Dollar(){</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">    </span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">    System.</span><em><span style="font-size:10.0pt;font-family:"Courier New";color:#0000C0;">out</span></em><span style="font-size:10.0pt;font-family:"Courier New"; color:black;">.println(</span><span style="font-size:10.0pt;font-family:"Courier New";color:#2A00FF;">"Dollar is construct!"</span><span style="font-size: 10.0pt;font-family:"Courier New";color:black;">);</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">   </span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">   }</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">}</span></p> <p align="left" style="text-align:left;text-autospace:none"><strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">class</span></strong><span style="font-size:10.0pt;font-family:"Courier New";color:black;"> Rmb{</span></p> <p align="left" style="text-align:left;text-autospace:none"><strong><span style="font-size:10.0pt; font-family:"Courier New";color:#7F0055;">public</span></strong><span style="font-size:10.0pt;font-family:"Courier New";color:black;"> Rmb(){</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;"> System.</span><em><span style="font-size:10.0pt;font-family:"Courier New";color:#0000C0;">out</span></em><span style="font-size:10.0pt;font-family:"Courier New"; color:black;">.println(</span><span style="font-size:10.0pt;font-family:"Courier New";color:#2A00FF;">"RMB is construct"</span><span style="font-size:10.0pt; font-family:"Courier New";color:black;">);</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">}</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">}</span></p> <p align="left" style="text-align:left;text-autospace:none"> </p> <p align="left" style="margin-bottom:7.5pt;text-align:left; text-indent:24.0pt;line-height:18.75pt;"><span style="font-family:宋体;color:black;">输出l果</span><span style="font-family: "Arial","sans-serif";color:black;">:<br /> </span><span style="font-size:10.0pt;font-family:"Courier New"; color:black;">Money is construct</span></p> <p align="left" style="text-align:left;text-autospace:none"><span style="font-size:10.0pt;font-family: "Courier New";color:black;">Dollar is construct!</span></p> <p align="left" style="margin-bottom:7.5pt;text-align:left; line-height:18.75pt;"><span style="font-size: 10pt; font-family: 'Courier New'; color: black; ">RMB is construct</span></p></span></p><img src ="http://www.aygfsteel.com/shanrenxj/aggbug/362728.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/shanrenxj/" target="_blank">q鹰</a> 2011-11-05 09:59 <a href="http://www.aygfsteel.com/shanrenxj/archive/2011/11/05/362728.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss> <footer> <div class="friendship-link"> <a href="http://www.aygfsteel.com/" title="狠狠久久亚洲欧美专区_中文字幕亚洲综合久久202_国产精品亚洲第五区在线_日本免费网站视频">狠狠久久亚洲欧美专区_中文字幕亚洲综合久久202_国产精品亚洲第五区在线_日本免费网站视频</a> </div> </footer> վ֩ģ壺 <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">«ɽ</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">¡</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">º</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">ʳ</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">Ȩ</a>| <a href="http://" target="_blank">ɳ</a>| <a href="http://" target="_blank">׳</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">ɽʡ</a>| <a href="http://" target="_blank">ƽ</a>| <a href="http://" target="_blank">â</a>| <a href="http://" target="_blank">º</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">ƽ</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">μ</a>| <a href="http://" target="_blank">ͨ</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">ױ</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">˹</a>| <a href="http://" target="_blank">«</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank">䰲</a>| <a href="http://" target="_blank"></a>| <a href="http://" target="_blank"></a>| <script> (function(){ var bp = document.createElement('script'); 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