public virtual global::java.util.SortedMap headMap(java.lang.Object arg0)
{
return global::MonoJavaBridge.JavaBridge.CallIJavaObjectMethod<java.util.SortedMap>(this, global::java.util.TreeMap.staticClass, "headMap", "(Ljava/lang/Object;)Ljava/util/SortedMap;", ref global::java.util.TreeMap._m14, global::MonoJavaBridge.JavaBridge.ConvertToValue(arg0)) as java.util.SortedMap;
}