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inotify+rsync+ssh数据实时同步

��阳江头夜送客 — Sun, 10 Jan 2010 12:07:00 GMT

Inotify 是文件系�l�事件监控机�Ӟ��计划包含在即��发布的 Linux 内核中作�?dnotify 的有效替代。dnotify 是较早内核支持的文�g监控机制。Inotify一�U�强大的、细�_�度的、异步的机制�Q�它满��各种各样的文件监控需要，不仅限于安全和性能。下面让我们一起学习如何安�?inotify 和如何构��Z��个示例用��L��间应用程序来响应文�g�pȝ��事�g�?/p>

1.1同步工具安装
1、输入命令：su root�Q�切换到��用户�?br /> 2、先查看linux的内核是否支持inotify�Q�支持inotify的内核最��ؓ2.6.13�Q�输入命令：uname –a。如下图所�C�，内核�?.6.27�Q�支持inotify�Q?br />
注：如果内核低于2.6.13�Q�请升��内核或重新安装内核版本更高的linux�pȝ��?br /> 3、徏立同步ssh信�Q关系�Q�输入命令：cd $HOME�Q�进入用��h��目录�?br /> 输入命��o�Q�ssh-keygen -t rsa (会出现几个提�C�Z��息，一直按回�R卛_��)�?br /> 会在 cd $HOME/.ssh/目录下生�?个文件id_rsa、id_rsa.pub�?br /> 输入命��o�Q�cp id_rsa.pub authorized_keys�Q�将id_rsa.pub拯��成authorized_keys�?br /> ��授权密钥分发到iEPG服务�?192.168.100.101)上，输入命��o�Q?br /> scp ~/.ssh/authorized_keys root@192.168.100.101:/root/.ssh/
如果有多��C��载服务器�Q�每台都��运行一�ơ上面的密钥下发命��o�?br /> 4、通过如下命��o查看�pȝ��是否支持inotify�Q�ll /proc/sys/fs/inotify
如果有如下输出，表示�pȝ��内核已经支持inotify�Q?br /> total 0
-rw-r--r-- 1 root root 0 Feb 21 01:15 max_queued_events
-rw-r--r-- 1 root root 0 Feb 21 01:15 max_user_instances
-rw-r--r-- 1 root root 0 Feb 21 01:15 max_user_watches
5、取得��Y件包inotify-tools-3.13.tar.gz�Q�放�?tmp下�?br /> 6、输入命令：tar zvxf inotify-tools-3.13.tar.gz�Q�解压��Y件包�?br /> 7、输入命令：cd inotify-tools-3.13�Q�进入解压后的目录�?br /> 8、输入命令：./configure
9、输入命令：make
10、输入命令：make install
11、在�pȝ��下执行命令：man inotify�?man inotifywait�?man inotifywatch卛_��得到相应的帮助信息，表示inotify安装成功�?br /> 12、输入命令：rsync�Q�查看rsync是否安装�?br /> rsync一般是�pȝ��默认安装�Q�如果没有安装就取得软�g包，安装�Ҏ��同inotify�?/p>

同步脚本使用
1、取得syncapps.sh脚本

#!/bin/sh
    SRC=/root/sys/
    SEND=iEPGService.dat
    PID_FILE=syncapps.pid

    function sync_files
    {
       cat $SEND | while read DST
       do
       rsync -avzq  --delete --exclude '/.version' --exclude '/.bak' $SRC $DST
       done

    }

    function inotify_func
    {
        inotifywait -mrq -e modify,delete,create ${SRC} | while read D E F;do
            # echo "$D : $E : $F"
            sync_files
        done
    }

    function stop
    {
        pkill inotifywait &>/dev/null && rm -f ${PID_FILE} &> /dev/null
    }

    case $1 in
        stop)
            echo -n "Stopping sync service"
            if [ -e ${PID_FILE} ]; then
                stop
                echo "Stopped"
                exit 0
            else
                echo "pid file not found"
                exit 2
            fi
            ;;
        start)
            echo -n "Starting sync service"
            if [ -f ${PID_FILE} ] && ((`ps awux | grep -v grep | grep -c inotifywait`)); then
                echo " already running: pid file found ($PID_FILE) and an inotifywait process is running"
                exit 1
            elif [ -f ${PID_FILE} ]; then
                echo -n "(stale pid file)"
            fi

            sync_files
            inotify_func&

            pid="$!"
            ps --ppid $pid -o pid,cmd | grep inotifywait | awk '{print $1}' > ${PID_FILE}

            echo "Started"
            ;;
        restart)
            $0 stop
            $0 start
            exit 0
            ;;
        status)
            echo -n "Getting status for syncer service "
            pid=`cat ${PID_FILE} 2>/dev/null`
            if [ -f ${PID_FILE} ] && ((`ps awux | grep -v grep | egrep -c "$pid.*inotifywait"`)); then
                echo "running (pid $pid)"
                exit 0
            elif [ -f ${PID_FILE} ]; then
                echo "not runing (pid file found $pid)"
                exit 3
            elif ((`ps awux | grep -v grep | egrep -c "$pid.*inotifywait"`)); then
                echo "not running (inotifywait procs found)"
                exit 4
            else
                echo "not running"
                exit 5
            fi
            ;;

        *)
            echo "Usage error"
            echo "Usage: $0 <start|stop|restart|status>"
            ;;
    esac

2、取得iEPGService.dat脚本�?br /> root@10.10.80.76:/root/files/
3、输入命令：chmod +x *.sh�Q�给文�g赋可执行权限�?br /> 4、输入命令：./syncapps.sh start�Q�启动同步工兗��?br /> 启动同步工具的输入命令：./syncapps.sh start
停止同步工具的输入命令：./syncapps.sh stop
重启同步工具的输入命令：./syncapps.sh restart
查看同步工具状态的输入命��o�Q?/syncapps.sh status
link

��阳江头夜送客 2010-01-10 20:07 发表评论

判断文�g格式

��阳江头夜送客 — Sun, 10 Jan 2010 11:56:00 GMT

首先阅读此文之前�Q�最好阅�?br /> http://hi.baidu.com/maml897/blog/item/324bf86369961ed4e6113a5c.html

http://hi.baidu.com/maml897/blog/item/fa5f0a7e1edef00129388ae2.html

其次�q�要知道一点常识，��是我们在记事本�{�一些文本工具中写的都是字符�Q�没有谁会去写字节（可以写字节，但是要用��L��D�的�~�辑器）�Q�但是其实，我们的写的是字符�Q�但��盘上真实存储的是字节�?/p>

�q�里��出��C��转换的问题，当然�Q�这些问题记事本本��n会帮助我们解冟뀂我们打开一个记事本�Q�然后文�?-另存为，你会发现有几�U�存储格式供您选择�Q?br /> ANSI格式�Q�就是ascii的格�?br /> Unicode格式�Q�采用国际通用的编码存�?br /> Unicode big endian格式�Q�这个和unicode有点区别�Q�但我也不明太具体的不同
UTF-8�Q�采用utf-8存储�Q�看�q�上面的两篇文章�Q�你会十分的了解�q�里介绍的编码。Utf-8�Q�是unicode的一�U�实现方式�?/p>

例如我们在记事本里面输入“�q��?#8221;两个字�?/p>

1.我们另存��C��本的时候，采用unicode存储�Q�那么虽然我们看到的字符�q�是“�q��?#8221;�Q�但是其实存储在��盘上的字节 ��实
8FDE�Q�连�Q?901A �Q�通）�Q�这个是规定的，unicode是国际上规定的，�l�世界上的每个字�W�分配的唯一�~�码。获取某个字�W�的unicode的方法，可以�ȝ��上查找，最��单的�Ҏ��Q�就是打开word文档�Q�输入字�W�，把光标移动到字符后面�Q�按alt+x�Q�word会自动把字符转换成unicode�~�码�Q�这里呢我们也可以看刎ͼ�用unicode存储汉字啊，每个汉字占用两个字节�?/p>

2.我们另存��C��本的时候，采用utf-8存储�Q�虽然我们看到的字符�q�是“�q��?#8221;�Q�但是其实存储在��盘上的字节 ��实已经变化了，�q�时候存储的�?br /> E8 BF 9E �Q�连�Q�E9 80 9A�Q�通）。这��是utf-8的存储的�~�码�Q�至于utf-8��Z��么这样存储，你可以阅��M��面的两篇文章来了解，可以看到�Q�utf-8使用3个字节存储一个汉字�?/p>

另外我们�q�要知道的就是：电脑怎么区分一个记事本是用什么存储的呢？
换句话说�Q��ؓ什么我用unicode存储�?FDE�Q�连�Q?901A �Q�通）�Q�电脑就知道�q�是unicode�~�码�Q�从而��用unicode解码�Q�还原�ؓ“�q��?#8221;呢？电脑又怎么知道E8 BF 9E �Q�连�Q�E9 80 9A�Q�通）�q�是按照utf-8的存储方式存储的呢？

�q�里有一�Ҏ��讎ͼ��是在存储字节的时候，��C��本首先在最前面标明�Q�这个记事本下面的存储格�?是utf-8�Q�还是unicode�?/p>

例如�Q?/p>

1.unicode存储“�q��?#8221;。磁盘字节真实存储的其实是：

FF FE 8FDE 901A

前两个FF FE是标讎ͼ�告诉电脑�Q�这个文档的存储方式是unicode

2.utf-8存储“�q��?#8221;。磁盘字节真实存储的其实是：

EF BB BF E8 BF 9E E9 80 9A

前三个EF BB BF 告诉电脑 �q�个文档是utf-8存储�?/p>

�Ҏ��不同�~�码的特点和标志,对一个文本文件判断编码方法如�?br /> 1 . UTF7 所有字节的内容不会大于127,也就是不大于&HFF
2 . UTF8 起始三个字节�?0xEF 0xBB 0xBF"
3 . UTF-16BE 起始三个字节�?0xFE 0xFF"
4 . UTF-16LE 起始三个字节�?0xFF 0xFE"

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;

public class FileEncodeReferee
{
    private File file;

    public FileEncodeReferee(File file)
    {
        this.file = file;
    }

    public FileEncodeReferee(String path)
    {
        file = new File(path);
    }

    public String getCharset()
    {
        File file = this.file;

        String charset = "GBK";
        byte[] first3Bytes = new byte[3];
        BufferedInputStream bis = null;
        try
        {
            //boolean checked = false;
            bis = new BufferedInputStream(new FileInputStream(file));
            bis.mark(0);
            int read = bis.read(first3Bytes, 0, 3);
            if (read == -1)
            {
                return charset;
            }
            if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE)
            {
                charset = "UTF-16LE";
                //checked = true;
            }
            else if (first3Bytes[0] == (byte) 0xFE
                    && first3Bytes[1] == (byte) 0xFF)
            {
                charset = "UTF-16BE";
                //checked = true;
            }
            else if (first3Bytes[0] == (byte) 0xEF
                    && first3Bytes[1] == (byte) 0xBB
                    && first3Bytes[2] == (byte) 0xBF)
            {
                charset = "UTF-8";
                //checked = true;
            }
            /** */
            /*******************************************************************
            * bis.reset(); if (!checked) { int loc = 0; while ((read =
            * bis.read()) != -1) { loc++; if (read >= 0xF0) { break; } if (0x80 <=
            * read && read <= 0xBF) // 单独出现BF以下的，也算是GBK { break; } if (0xC0 <=
            * read && read <= 0xDF) { read = bis.read(); if (0x80 <= read &&
            * read <= 0xBF)// 双字�?nbsp;(0xC0 - 0xDF) { // (0x80 - 0xBF),也可能在GB�~�码�?br />             * continue; } else { break; } } else if (0xE0 <= read && read <=
            * 0xEF) { // 也有可能出错�Q�但是几率较��?nbsp;read = bis.read(); if (0x80 <= read &&
            * read <= 0xBF) { read = bis.read(); if (0x80 <= read && read <=
            * 0xBF) { charset = "UTF-8"; break; } else { break; } } else {
            * break; } } } System.out.println(loc + " " +
            * Integer.toHexString(read)); }
            ******************************************************************/
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            if (bis != null)
            {
                try
                {
                    bis.close();
                }
                catch (Exception ex)
                {
                    ex.printStackTrace();
                }
            }
        }
        return charset;
    }

    public static void main(String[] args)
    {
        FileEncodeReferee fer = new FileEncodeReferee("F://锁表1.sql");
        System.out.println(fer.getCharset());
    }
}

��阳江头夜送客 2010-01-10 19:56 发表评论

��阳江头夜送客 — Mon, 19 Oct 2009 13:41:00 GMT

在cglib �?BeanMap的用�?br />
1.导入cglib-nodep-2.1.3.jar

2.在javaBean 对象中重写toString()�Ҏ�� 比如是UserManageVo.Java
public String toString(){
return BeanTools.getBeanDesc(UserManageVo.this);
}
java 代码

1package BeanUtils;
2
3import net.sf.cglib.beans.BeanMap;
4
5public class BeanTools {
6    private static String LINE = System.getProperty("line.separator", "\r\n");
7
8    /**
9     * 对象中重写toString()�Ҏ��,在打印日志的时候调�?br /> 10     * @param obj
11     * @return
12     * @return String
13     */
14    public static String getBeanDesc(Object obj) {
15        StringBuffer bf = new StringBuffer();
16        bf.append(LINE + "{" + LINE + "Class = " + obj.getClass().getName()
17                + LINE);
18        BeanMap beanMap = BeanMap.create(obj);
19        for (Object object : beanMap.keySet()) {
20            Object value = beanMap.get(object);
21            if (null != value) {
22                /**
23                 * �q�是定义对象的是时候用�?br /> 24                 */
25                String className = value.getClass().getName();
26                if (className.startsWith("test.UserManageEvent")
27                        || className.startsWith("test.BasicEvent")
28                        || className.startsWith("test.UserManageVo")) {
29                    bf.append(object + " = " + getBeanDesc(value) + LINE);
30                }
31
32                /**
33                 * �q�是数组对象的是时候用�?br /> 34                 */
35                if (className.startsWith("Ltest.UserManageEvent")
36                        || className.startsWith("Ltest.BasicEvent")
37                        || className.startsWith("Ltest.UserManageVo")) {
38                    Object[] objs = (Object[]) value;
39                    for (int i = 0; i < objs.length; i++) {
40                        bf.append(object + " = " + getBeanDesc(objs[i]) + LINE);
41                    }
42                }
43
44                /**
45                 * 对String数组重写toString()�Ҏ��
46                 */
47                if (className.startsWith("[Ljava.lang.String")) {
48                    Object[] objs = (Object[]) value;
49                    for (int i = 0; i < objs.length; i++) {
50                        bf.append(object + "[" + i + "]" + " = " + objs[i]
51                                + LINE);
52                    }
53                }
54            }
55            bf.append(object + " = " + value + LINE);
56        }
57        bf.append("}");
58        return bf.toString();
59    }
60}

java代码
/Files/yjlongfei/beanUtil.rar

��阳江头夜送客 2009-10-19 21:41 发表评论

BeanUtils.copyProperties() 用法

��阳江头夜送客 — Mon, 19 Oct 2009 13:21:00 GMT

一、简介：

BeanUtils提供对Java反射和自省API的包装。其主要目的是利用反��机制对JavaBean的属性进行处理。我们知道，一个JavaBean通常包含了大量的属性，很多情况下，对JavaBean的处理导致大量get/set代码堆积�Q�增加了代码长度和阅��M��码的隑ֺ��?/span>

二、用法：

如果你有两个��h��很多相同属性的JavaBean�Q�我们对一个对象copy 到另外一个对象，可用用下面的�Ҏ��?br />
1. 导入commons-beanutils.jar
2. 导入commons-logging-1.1.jar
3. 构徏UserManageVo , UserManageEvent 对象 ,�q�两个对象的属性相�?br /> 4. 调用 BeanUtils.copyProperties(UserManageVo, UserManageEvent)
java 主要代码

1import java.lang.reflect.InvocationTargetException;
2import org.apache.commons.beanutils.BeanUtils;
3import test.BasicEvent;
4import test.UserManageEvent;
5import test.UserManageVo;
6
7public class TestCase {
8
9    public static void main(String[] args) {
10        UserManageEvent event = new UserManageEvent();
11        event.setName("zhangsan");
12        event.setUserId("1");
13
14        BasicEvent basicEvt = new BasicEvent();
15        basicEvt.setEventId("2");
16        basicEvt.setVersion("version");
17
18        event.setEvent(basicEvt);
19        UserManageVo vo = new UserManageVo();
20        try {
21            BeanUtils.copyProperties(vo, event);
22            System.out.println(vo.getUserId());
23            System.out.println(vo.getName());
24            System.out.println(vo.getEvent());
25        } catch (IllegalAccessException e) {
26            e.printStackTrace();
27        } catch (InvocationTargetException e) {
28            e.printStackTrace();
29        }
30    }
31}

java代码�Q?br /> /Files/yjlongfei/test.rar

��阳江头夜送客 2009-10-19 21:21 发表评论

MyEclipse6.5上基于JAX-WS开发Webservice(中文�C�Z��)

��阳江头夜送客 — Sat, 17 Oct 2009 14:50:00 GMT

关键�? webservice

1. Introduction
This document will outline the process of developing a JAX-WS web service and deploying it using MyEclipse 6.5 to the internal MyEclipse Tomcat server. The web service used in this tutorial will be a very simple calculator service that provides add, subtract, multiply and divide operations to the caller.

MyEclipse also supports developing web services using the existing XFire framework from previous MyEclipse releases. For folks needing to develop and deploy WebSphere JAX-RPC or WebSphere JAX-WS web services, please take a look at our MyEclipse Blue Edition of the MyEclipse IDE.

Additional resources covering web service creation using JAX-RPC, JAX-WS or XFire are included in the Resources section of this document.

2. System Requirements
This tutorial was created with MyEclipse 6.5. If you are using another version of MyEclipse (possibly newer), most of these screens and instructions should still be very similar.

If you are using a newer version of MyEclipse and notice portions of this tutorial looking different than the screens you are seeing, please let us know and we will make sure to resolve any inconsistencies.

3.新徏一个工�E?
开始我们新��Z��个Web Service Project工程File->New->Web Service Project(Optional Maven Support)

Note:A JAX-WS web service can also be generated in any existing Java EE 5 web project.

我们�l�这个工�E�取名�ؓWebServiceProject.注意JAX-WS支持只在javaEE5或更高版本的工程中是可行的。如果你需要��用低版本的工�E�类�?java1.4或�?.3)�Q�那么只能��用XFire Web Service代替JAX-WS�?

�q�里我们使用上面的JAX—WS�?
4.创徏服务�c?
服务�c�d��是一个普通的java�c�，负责提供我们惌��发布的执行方法。这里我们写一个简单的计算器类�Q�实现几个典型的计算器应用方法，如加减乘除�?
首先我们先徏一个包�Q�WebServiceProject->src->new->package,取名com.myeclipseide.ws

让后我们在这个包下徏一个类,Calculator.java.

�Ҏ��上面提到的，�q�个计算器类实现计算器的加减乘除��法�Q�简单实玎ͼ�
Java代码

package com.myeclipseide.ws;

public class Calculator {
public int add(int a, int b) {
return (a + b);
}

public int subtract(int a, int b) {
return (a - b);
}

public int multiply(int a, int b) {
return (a * b);
}

public int divide(int a, int b) {
return (a / b);
}
}

可以看出�Q�这个类中的�Ҏ��是非常简单的�Q�没有用到特�D�的注释�q�有接口�Q�父�c�M��cȝ��东西�?
5.创徏一个Web Service
在上面的工具条中点击新徏Web Service

Note�Q�如果没有的话可以File->New->others->Myeclipse->WebService->webService
点击之后出现的屏�q�，在Strategy中选择Bottom-up scenario�Q�因为我们已�l�徏立好了Calculator�c�而且��x��据它建立JAX-WS服务�?br />

下面是创建的最后一个屏�q�，你需要选择提供webService�Ҏ��的javaBean�Q�在我们�q�个例子中就是我们已�l�徏立好的Calculator�c�R�?br />

填好之后�Q�Myeclipse会自动帮我们填满其他的项�Q�Select Generate WSDL in project and hit Finish.

点击完成之后�Q�Myeclipse会自动生成CalculatorDelegate代理�c�，�q�有一些必��ȝ��JAX-WS描述�W�，而且会自动在服务器目录下的web.xml中配�|�WebService的一些mappings�Q�方便将webService部��v到服务器中�?

到此web service已经建立好了�Q�我们开始部�|�它然后�q�行��试�?
6.部��v和测试webService�?
�q�里我们不��用用Myeclipse自带的tomcat服务器，使用自己应经在电脑中部��v好的tomcat5.5�?
在server面板中右击，选择configure

部��v自己的tomcat注意选择jdk要跟��目中的相同�?

现在要向工程中导入JAX-WS的jar�?
在项目名�U�C��叛_��->properties->Add Library->Myeclipse Libraries->最后面的两个�?

点击完成�Q�导入成功�?
Note�Q�Myeclipse自带的tomcat中有自带的这两个jar包，可以不用导入�?

6.1部��v
在部�|�好的tomcat服务器上叛_��选择Add Deployment

点击完成�?
6.2��试
�q�行tomcat服务器，在工��h��中点击launch WebService Explorer

打开后，点击右上角的WSDL视图�Q�可以看��C��面的屏幕

在WSDL URL中填写�\径：http://localhost:8888/WebServiceProject/CalculatorPort?WSDL
解释下�\径组成：
http://localhost:8888/是服务器的�\径，我的端口��h��8888�Q�可以根据自��q��更改�Q�一般都�?080�?
/WebServiceProject = We know by default the Web Context-root that is used to deploy(部��v) web projects matches the name of the projects. (因�ؓ我们没有��个工�E�自定义我们的Web Context-root�Q�所以他��是�q�个工程的名�?
/CalculatorPort = As we saw from the last screenshot in Section #5, when our JAX-WS web service was generated, it was bound using a servlet-mapping in the web.xml file to the /CalculatorPort path.
XML代码

<servlet>
    <description>JAX-WS endpoint - CalculatorServicedescription>
    <display-name>CalculatorServicedisplay-name>
    <servlet-name>CalculatorServiceservlet-name>
    <servlet-class>
        com.sun.xml.ws.transport.http.servlet.WSServlet
    servlet-class>
    <load-on-startup>1load-on-startup>
  servlet>
  <servlet-mapping>
    <servlet-name>CalculatorServiceservlet-name>
    <url-pattern>/CalculatorPorturl-pattern>
  servlet-mapping>
<servlet>
    <description>JAX-WS endpoint - CalculatorServicedescription>
    <display-name>CalculatorServicedisplay-name>
    <servlet-name>CalculatorServiceservlet-name>
    <servlet-class>
        com.sun.xml.ws.transport.http.servlet.WSServlet
    servlet-class>
    <load-on-startup>1load-on-startup>
  servlet>
  <servlet-mapping>
    <servlet-name>CalculatorServiceservlet-name>
    <url-pattern>/CalculatorPorturl-pattern>
  servlet-mapping>

WSDL = This is a universal query string argument that can be added to the end of any web service which will tell the web service to return it's full WSDL to the caller. In this case, the WSDL is returned to our Web Services Explorer tool which loads it up, and displays the web services exposed operations to us.
弄清楚之后，我们开始测试，比如我们选择add�Ҏ��Q?
填写args�Q�点击go�Q�在status中就会显�C�结果�?nbsp;

�l�果是正��的�?
7.创徏Webservice Client
现在我们已经部��v好Webservice�Q�而且应经��试�q�了�Q�那我们新徏一个Webservice client�Q�来调用Webservice提供的方法�?
7.1新徏一个java project�Q�给他取个名字。比如我们叫它ClientofWebService

在工��h��中点击new Web Service Client

然后按照以下步骤操作�Q?

The last step of the web service client creation is to specify either a WSDL File or a WSDL URL for the wizard to retrieve the web service WSDL from. In our case we are using the URL and generate the client into the new package com.myeclipseide.ws.client:

http://localhost:8888/WebServiceProject/CalculatorPort?WSDL

点击Next知道完成�?
可以看到在新建的java project ClientofWebService中，src文�g夹下产生了许多的文�g�Q�根据名�U�我们大体可以了解其意思，可以打开看一下源代码�Q�其实不隄��解。比如add文�g�Q�就是Calculator�c�M��add�Ҏ��的两个参数的get和set�Ҏ��。其他类伹{�?
我们在文件夹下见一个类test.java写一个main函数��试
Java代码

public static void main(String[] args) {
    /* Create the service instance */
    CalculatorService service = new CalculatorService();
    CalculatorDelegate delegate = service.getCalculatorPort();

    /* Using the web service, perform the 4 calculations */
    System.out.println( "1. 3+7=" + delegate.add(3, 7));
    System.out.println( "2. 12-2=" + delegate.subtract(12, 2));
    System.out.println( "3. 9*9=" + delegate.multiply(9, 9));
    System.out.println( "4. 40/2=" + delegate.divide(40, 2));
}

�q�行得到如下�l�果�Q?
1. 3+7=10
2. 12-2=10
3. 9*9=81
4. 40/2=20
��试完成�?

本文来自CSDN博客�Q��{载请标明出处�Q�http://blog.csdn.net/foart/archive/2009/06/21/4287515.aspx

��阳江头夜送客 2009-10-17 22:50 发表评论