build.xml

<project name="FightingGame" basedir="." default="compile">

  <!-- Set global properties for this build -->
  <property name="src.dir"     value="src"/>
  <property name="build.dir"   value="build"/>
  <property name="dist.dir"    value="dist"/>
  <property name="lib.dir"     value="lib"/>
  <property name="main-class"  value="io.forsome.game.Main"/>

  <!-- Initialize the build directory structure -->
  <target name="init">
    <mkdir dir="${build.dir}"/>
    <mkdir dir="${dist.dir}"/>
    <mkdir dir="${dist.dir}/lib"/>
  </target>

  <!-- Clean the build directory -->
  <target name="clean">
    <delete dir="${build.dir}"/>
    <delete dir="${dist.dir}"/>
  </target>

  <!-- Compile the source code into the build directory -->
  <target name="compile" depends="init">
    <javac srcdir="${src.dir}" destdir="${build.dir}" includeantruntime="false">
      <classpath>
        <fileset dir="${lib.dir}">
          <include name="**/*.jar"/>
        </fileset>
      </classpath>
      <compilerarg value="--release"/>
      <compilerarg value="14"/>
    </javac>
    <!-- Copy resources to build directory -->
    <copy todir="${build.dir}">
      <fileset dir="${src.dir}" includes="**/*"/>
    </copy>
  </target>

  <!-- Create the distribution directory and jar the compiled code along with dependencies -->
  <target name="dist" depends="compile">
    <jar destfile="${dist.dir}/FightingGame.jar">
      <!-- Include compiled classes and resources -->
      <fileset dir="${build.dir}" includes="**/*"/>
      <!-- Include libraries -->
      <zipgroupfileset dir="${lib.dir}" includes="**/*.jar"/>
      <!-- Manifest -->
      <manifest>
        <attribute name="Main-Class" value="${main-class}"/>
      </manifest>
    </jar>
  </target>

  <!-- Clean, compile, and build the project -->
  <target name="all" depends="clean,dist"/>

  <!-- Run the application -->
  <target name="run" depends="dist">
    <java jar="${dist.dir}/FightingGame.jar" fork="true"/>
  </target>
</project>