update stuff

build.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="Rechnernetze" default="run" basedir=".">
+
+    <property name="src.dir" value="."/>
+    <property name="build.dir" value="build"/>
+    <property name="classes.dir" value="${build.dir}/classes"/>
+    <property name="main-class" value=""/>
+
+    <target name="clean">
+        <delete dir="${build.dir}"/>
+    </target>
+
+    <target name="compile">
+        <mkdir dir="${classes.dir}"/>
+        <javac srcdir="${src.dir}" destdir="${classes.dir}"
+               includeantruntime="false" debug="true">
+            <compilerarg value="-Xlint:unchecked"/>
+        </javac>
+    </target>
+
+    <target name="run" depends="compile">
+        <java classname="${main-class}" classpath="${classes.dir}" fork="true"/>
+    </target>
+
+</project>