Example
If you want to set a property to a location then name/location assignment is used.
To use the properties surround them with ${}.
Example
<property location="destination" name="dest.dir"/>
<property name="war.dir" location="${dest.dir}/${project.name}"/>
A build.xml as shown in following code box displays how effectively property tasks can be used within a build.xml:
<project basedir="." default="all">
<property name="gensrc.dir" value="gen_src"/>
<property name="release.dir" value="release"/>
<property name="src.dir" value="../src"/>
<property name="lib.dir" value="../externals/lib"/>
<property name="class.dir" value="classes"/>
<property name="class.dir.lib" value="${class.dir}/lib"/>
<property name="class.dir.src" value="${class.dir}/src"/>
<import file="one-jar-ant-task.xml"/>
<!-- Deletes the directories and files....-->
<target name="clean">
<delete dir="${gensrc.dir}"/>
<delete dir="${class.dir}"/>
<delete>
<fileset dir="${lib.dir}" >
<include name="**/xyz.jar"/>
</fileset>
<fileset dir="${release.dir}" >
<include name="**/abc.jar"/>
</fileset>
</delete>
</target>
<!-- Prepare the Directories needed for code generation -->
<target name="prepare">
<mkdir dir="${class.dir}"/>
<mkdir dir="${gensrc.dir}"/>
<mkdir dir="${class.dir.lib}"/>
<mkdir dir="${class.dir.src}"/>
</target>
<!-- Compile the source code available in src folder -->
<target name="compilesrc">
<javac srcdir="${src.dir}" destdir="${class.dir.src}" target="1.4" source="1.4"
debug="off" deprecation="on" optimize="off" encoding="iso-8859-1">
<classpath >
<fileset dir="${lib.dir}" includes="**/*.jar"/>
</classpath>
</javac>
<copy todir="${class.dir.src}">
<fileset dir="${src.dir}" includes="*.properties"/>
</copy>
</target>
<!-- Generate the lib jar file -->
<target name="lib">
<jar manifest="manifest.mf" destfile="${lib.dir}/xyz.jar" includes="**/*.class" basedir="${class.dir.lib}" />
</target>
</project>
This post first appeared on Interview Questions On Java,Java EE, please read the originial post: here
