Java 8 Convert Object to String separated by VALUE

Question

I'm trying to conver a java Object to a string separated by "SEPARATOR".

Example

public class Person{

int id;
String name;
String age;
String sex;
}

Main method

Person per = new Person(1, "Kevin", "20", "Male");
String objectAsText = per.ConvertObjectToString(per, "|");

Expected output

1|Kevin|20|Male

Note that the java object is not a list. And I also want to add a validation so the method ConvertObjectToString can avoid printing object values that are null. ie

Person per = new Person(1, "Kevin", "Male");
String objectAsText = per.ConvertObjectToString(per, "|");

Expected output

1|Kevin|Male

I know that this can be achieved using toString method, but I want to know if there is any other efficient way. Also I don't want to check value by value if null since the java object can be large.

As mentioned in the question I override the toString method and had concatenated my values. But I think it is not the perfect solution. — Kevin Valdez
– Kevin Valdez, Commented Jan 6, 2021 at 19:14
Why override toString()? Just make the ConvertObjectToString method do what you want. BTW: if ConvertObjectToString is a member method of Person, it shouldn't take the Person as an argument. — Kevin Anderson
– Kevin Anderson, Commented Jan 6, 2021 at 19:44
Are you trying to create the strings generically, without hard-coding the specific fields? So the ConvertObjectToString method would automatically adapt if more fields were added later? If so, edit your your Question to say so. Your Question is not clear as presently written. — Basil Bourque
– Basil Bourque, Commented Jan 6, 2021 at 20:40

Ryuzaki L · Accepted Answer · 2021-01-06 20:20:48Z

1

If you don't want to check each value, I would recommend java object converting into JSON, like into Map<String,Object> and then use Collectors.joining

String value = map.values()
            .stream().filter(Objects::nonNull)
            .map(Object::toString)
            .collect(Collectors.joining("|"));

You can do it using the reflection package, but make sure your fields are public

 Person per = new Person(1, "Kevin", "20", "Male");

   String value = Arrays.stream(Person.getClass().getFields())
           .map(f-> {
               try {
                   return f.get(per).toString();
               } catch (IllegalAccessException e) {
                   e.printStackTrace();
               }
               return null;
           }).filter(Objects::nonNull).collect(Collectors.joining("|"));

    System.out.println(value); //1|Kevin|20|Male

edited Jan 6, 2021 at 20:20

answered Jan 6, 2021 at 19:45

Ryuzaki L

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