Getting data from REST

@RestController("/lines")
public class LinesController {

    private List<String> strings;

    public LinesController() {
        strings = new ArrayList<>();
        strings.add("zero line");
        strings.add("first line");
        strings.add("second line");
    }
    
    @GetMapping("/{id}")
    public String getLine(@PathVariable int id){
        return strings.get(id);
    }

}

and the response that a user got from it:

"second line"

@RestController("/lines")
class LinesController {
    private val strings = listOf("zero line", "first line", "second line")

    @GetMapping("/{id}")
    fun getLine(@PathVariable id: Int): String {
        return strings[id]
    }

}

and the response that a user got from it:

"second line"