[20-05-20][Thinking in Java 29]Java Container 1 - ArrayList

 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