Map string with key values to Map in Java

StringToMap.java

public class StringToMap {
  public static Map<String, String> map(String str) {
    return (HashMap<String, String>) Arrays
      .asList(str.split(","))
      .stream().map(s -> s.split("="))
      .collect(Collectors.toMap(e -> e[0], e -> e[1]));
  }
}