1 package test_17_3; 2 3 import java.util.ArrayList; 4 5 public class Gerbil { 6 7 int gerbilNumber; 8 9 public Gerbil(int i) { 10 11 gerbilNumber = i; 12 } 13 14 void hop() { 15 System.out.println(gerbilNumber + " " + "Jumping"); 16 } 17 18 public static void main(String[] args) { 19 20 ArrayList<Gerbil> arrayList = new ArrayList<Gerbil>(); 21 for (int i = 0; i < 10; i++) { 22 arrayList.add(new Gerbil(i + 1)); 23 } 24 25 for (int i = 0; i < arrayList.size(); i++) { 26 arrayList.get(i).hop(); 27 } 28 } 29 }
结果如下:
1 Jumping
2 Jumping
3 Jumping
4 Jumping
5 Jumping
6 Jumping
7 Jumping
8 Jumping
9 Jumping
10 Jumping