Make an Order by date

Question

I have the following class I want to sort her values by date

public class ItemListAnuncios {

    private String texto;
    private String data;

    public ItemListPropaganda(String texto, String data) {
        this.texto = texto;
        this.data= data;
    }

    public int getTexto() {
        return texto;
    }

    public void setTexto(String texto) {
        this.texto= texto;
    }

    public String getData() {
        return data;
    }

    public void setData(String data) {
        this.data= data;
    }

I have in my main class:

private ArrayList<ItemListAnuncios > itens;

How can I sort? I’d better send it in date or String format?