From Java to Scala : some examples

import java.util.List;
 
public class Bob {
 
    private final List<String> preferedMatters;
    private final List<String> neutralMatters;
    private final List<String> hatedMatters;
 
    public Bob(List<String> preferedMatters, List<String> neutralMatters, List<String> hatedMatters) {
        this.preferedMatters = preferedMatters;
        this.neutralMatters = neutralMatters;
        this.hatedMatters = hatedMatters;
    }
 
    public String listen(String something) {
 
        if (preferedMatters.stream()
                           .anyMatch(s -> something.toLowerCase()
                                                   .contains(s))) {
            return "Oh Yes";
        } else if (neutralMatters.stream()
                                 .anyMatch(s -> something.toLowerCase()
                                                         .contains(s))) {
            return "Ok";
        } else if (hatedMatters.stream()
                               .anyMatch(s -> something.toLowerCase()
                                                       .contains(s))) {
            return "Terrible";
        }
 
        throw new IllegalArgumentException("No!!!");
    }
 
    public List<String> getPreferedMatters() {
        return preferedMatters;
    }
 
    public List<String> getNeutralMatters() {
        return neutralMatters;
    }
 
    public List<String> getHatedMatters() {
        return hatedMatters;
    }
 
 
}

class Bob(preferedMatters: List[String], neutralMatters: List[String], hatedMatters: List[String]) {
  def listen(something: String) : String = {
 
    if (preferedMatters.exists(something.toLowerCase().contains(_))){
      return "Oh Yes"
    }
 
    else if (neutralMatters.exists(something.toLowerCase().contains(_))){
      return "Ok"
    }
 
    else if (hatedMatters.exists(something.toLowerCase.contains(_))){
      return "Terrible"
    }
 
    throw new IllegalArgumentException("No!!!")
  }
 
  def getPreferedMatters() = preferedMatters
 
  def getNeutralMatters() = neutralMatters
 
  def getHatedMatters = hatedMatters

  def listen(something: String): String = {
 
    something match {
      case x if (preferedMatters.exists(something.toLowerCase().contains(_))) => "Oh Yes"
      case x if (neutralMatters.exists(something.toLowerCase().contains(_))) => "Ok"
      case x if (hatedMatters.exists(something.toLowerCase().contains(_))) => "Terrible"
      case _ => throw new IllegalArgumentException("No!!!")
    }
 
  }