comprara string perro, casa, gato ordenarlos alfabeticamente
import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList<String> array = new ArrayList<String>(); array.add("casd"); array.add("dsa"); array.add("sad"); array.add("asd"); array.add("sad"); int count = 0; for (String s: array) { count = count + 1; } System.out.println(count); System.out.println(array.indexOf("sad")); } }