java：模拟栈操作

 1 import java.util.arraylist;
 2 
 3 public class mystack {
 4 
 5     private arraylist<object> arraylist;
 6 
 7     public mystack() {
 8         arraylist = new arraylist<>();
 9     }
10 
11     public void pop(object o) {
12         arraylist.add(o);
13     }
14 
15     public object myramove() {
16         int size = arraylist.size();
17         if (size > 0) {
18             return arraylist.remove(arraylist.size() - 1);
19         }else {
20             return -1;
21         }
22     }
23     public int getsize() {
24         return arraylist.size();
25     }
26 
27 }