java 验证增加数据

 1 package test;
 2 
 3 import java.util.List;
 4 import java.util.ArrayList;
 5 import java.util.Collection;
 6 
 7 public class ImplementsDemo {
 8     public static void main(String[] args) {
 9         List<String> allList=null;
10         Collection<String> allCollection=null;
11         allList=new ArrayList<String>();
12         allCollection=new ArrayList<String>();
13         allList.add("Hello!");//在开头增加
14         allList.add(0,"World");
15         System.out.println(allList);
16         allCollection.add("hjw");
17         allCollection.add("www..ss.cc.");
18         allList.addAll(allCollection);
19         System.out.println(allList);
20         allList.addAll(
21                 0,allCollection);//0，表示在末尾增加
22         System.out.print(allList);
23         
24     }
25     
26 }