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Indicate the init and max memory when compiling

<project name="MyProject" default="compile" basedir=".">     <property name="sourcedir" value="${basedir}/src"/>     <property name="targetdir" value="${basedir}/build"/>     <property name="librarydir" value="${basedir}/lib"/>          <path id="libraries">         <fileset dir="${librarydir}">             <include name="*.jar"/>         </fileset>     </path>     <target name="clean">         <delete dir="${targetdir}"/>         <mkdir dir="${targetdir}"/>     </target>     <target name="compile" depends="copy-resources">       <javac srcdir="${sourcedir}"              destdir="${targetdir}"              classpathref="libraries"              debug="on"              fork="true"              memoryMaximumSize="1024m"              memoryInitialSize="256m">       </javac>            </target>     <target name="copy-resources">         <copy todir="${targetdir}">             <fileset dir="${sourcedir}">                 <exclude name="**/*.java"/>             </fileset>         </copy>     </target>     <target name="run" depends="compile">         <java classname="Main" classpathref="libraries">                   <classpath path="${targetdir}"/>              <jvmarg value="-Djava.library.path=./lib"/>          </java>     </target> </project>