public String getName(String name){
        return " name: "+name;
    }

public String getName(String name){
       if(name!=null )
        return " name: "+name;

    return " name: anonimus";
 }

com.google.common.base

Preconditions 

 public String getName(String name){

    сheckNotNull(name, "name should not be null.");

    return " name: "+name;
  }


где 
  public static <T> T checkNotNull(T reference, @Nullable Object errorMessage) {
    if (reference == null) {
      throw new NullPointerException(String.valueOf(errorMessage));
    }
    return reference;
  }

   public String getName(@NotNull String name){
        return name;
    }

return  Collections.EMPTY_LIST;
           Collections.EMPTY_MAP;
           Collections.EMPTY_SET;

  public static class Name{
        public Option<String> firstName = new Option<String>(null);
        public Option<String> lastName = new Option<String>(null);       
    }