Unsolved problem about ant(Solved now!)

 I follow the operations in the book but I failed to start ant.

 

Operations:

1) Write a simple java program named MyDate as follows:

import java.util.Date;public class MyDate{public static void main(String [] args){Date now = new Date();System.out.println(now.toString());}}

 

2) Create a XML file and write follows words in it:

<?xml version="1.0" encoding="UTF-8" ?><project name="MyDate" default="run" basedir="."><property name="src" value="src"/><property name="dest" value="build/classes"/><property name="lib" value="build/lib"/><propery name="date_jar" value="build/lib/date.jar"/><target name="init"><mkdir dir="${dest}"/><mkdir dir="${lib}"/></target><target name="compile" depends="init"><javac srcdir="${src}" destdir="${dest}"/></target><target name="build"><jar destfile="date_jar" basedir="${dest}" depends="compile"><manifest><attribute name="Main-Class" value="MyDate"/></manifest></jar></target><target name="run" depends="build"><java classname="MyDate" classpath="${date_jar}"/></target><target name="clean"><delete file="${date_jar}"/><delete file="${dest}"/><delete file="${lib}"/></target></project>

3) Open the cmd window and type the command as follows:

Now the directory of the project is as follows:

The MyDate.java is under the folder src

4) Start use ant

 

Tips: I don't know why would it happen and I've serched many materials but still can't find the solution.

 

I've got the solutions!!!!! 8.18

modify the build.xml as follows:

 <project name="MyDate" default="run" basedir="."> <description> simple example build file </description> <!-- set global properties for this build --> <property name="src" location="src"/> <property name="dest" location="build/classes"/> <property name="lib" location="build/lib"/> <target name="init"> <!-- Create the time stamp --> <!-- tstamp/ --> <!-- Create the build directory structure used by compile --> <mkdir dir="${dest}"/> <mkdir dir="${lib}"/> </target> <target name="compile" depends="init" description="compile the source " > <!-- Compile the java code from ${src} into ${build} --> <javac srcdir="${src}" destdir="${dest}"/> </target> <target name="build" depends="compile" description="generate the distribution" > <!-- Put everything in ${build} into the MyProject-${DSTAMP}.jar file --> <jar jarfile="${lib}/MyDate.jar" basedir="${dest}"> <manifest> <attribute name="Main-Class" value="MyDate"/> </manifest> </jar> </target> <target name="run" depends="build"><java classname="MyDate" classpath="${lib}/MyDate.jar"/> </target> <target name="clean" description="clean up" > <!-- Delete the ${build} and ${dist} directory trees --> <delete dir="${dest}"/> <delete dir="${lib}"/> </target></project>

The lesson I've got here is that: Don't always believe the book. Just go to the offical site to get the solution.

I got a example from the site and modified it and then I can run ant!

So cool!