编辑器
import java.util.*; public class Main { public static void main(String[] args) { ArrayList<String> fruits = new ArrayList<>(); fruits.add("Apple"); fruits.add("Banana"); fruits.add("Orange"); fruits.add("Mango"); Collections.swap(fruits, 0, 2); // Swap first and third element System.out.println(fruits); } }
[Orange, Banana, Apple, Mango]
编辑器