Restored ant build

Java/README.adoc

 = Java
 
+== Maven
+
 This application is written with Java 14 preview features, and can be built using the `mvn package` command. To run it, use the `java -jar --enable-preview target/conway-1.0-SNAPSHOT.jar`.
 
+== Ant
+
+To build with `ant`, https://github.com/junit-team/junit4/wiki/Download-and-Install[download and install] Junit 4 in the `lib` folder, and run the `ant package` command. Then run the application by using the `java --enable-preview -jar out/conway.jar`.
+
 == Tests
 
 The Java application can be tested by running `mvn test` at the root of the folder.
+
+If built with `ant`, use the `ant test` command.
+

Java/build.xml

+<?xml version="1.0"?>
+<project name="Conway" default="package">
+    <property name="src.dir" value="src"/>
+    <property name="build.dir" value="out"/>
+    <property name="lib.dir" value="lib"/>
+
+    <target name="clean">
+        <echo>Cleaning output</echo>
+        <delete dir="${build.dir}" />
+    </target>
+
+    <target name="test" depends="package">
+        <echo>Executing unit tests</echo>
+        <junit printsummary="on" haltonfailure="yes" fork="true">
+            <jvmarg line="--enable-preview"/>
+            <classpath>
+                <path location="${build.dir}/conway.jar"/>
+                <pathelement location="${lib.dir}/junit-4.13.1.jar"/>
+                <pathelement location="${lib.dir}/hamcrest-core-1.3.jar"/>
+            </classpath>
+            <formatter type="brief" usefile="false" />
+            <batchtest>
+                <fileset dir="${build.dir}" includes="ma/akos/Conway/Tests.class" />
+            </batchtest>
+        </junit>
+    </target>
+
+    <target name="build">
+        <echo>Building application</echo>
+        <mkdir dir="${build.dir}"/>
+        <javac destdir="${build.dir}">
+            <classpath>
+                <pathelement location="${lib.dir}/junit-4.13.1.jar"/>
+            </classpath>
+            <compilerarg value="--enable-preview" />
+            <compilerarg value="--source=15" />
+            <src path="${src.dir}"/>
+        </javac>
+    </target>
+
+    <target name="package" depends="build">
+        <echo>Packaging application</echo>
+        <jar destfile="${build.dir}/conway.jar"
+             basedir="${build.dir}"
+             includes="**/*.class">
+            <manifest>
+                <attribute name="Main-Class" value="Main"/>
+            </manifest>
+        </jar>
+    </target>
+</project>