differ比较两个字符串的差异

 1 import java.util.ArrayList;
 2 
 3 public class differ {
 4 
 5     public static void main(String[] args) {
 6         System.out.println(differ("abcde","abdefk"));
 7         System.out.println(differ("aba","aababb"));
 8     }
 9     public static String differ(String a,String b)
10     {
11         String plus="";
12         String neg="";
13         ArrayList arr=new ArrayList();
14         for(int i=0;i<a.length();i++)
15         {
16             arr.add(a.charAt(i));
17         }
18         for(int j=0;j<b.length();j++)
19         {
20             if(arr.indexOf(b.charAt(j))!=-1)
21                 arr.remove(arr.indexOf(b.charAt(j)));//说明有
22             else
23                 plus+=",+"+b.charAt(j);
24         }
25         for(int i=0;i<arr.size();i++)
26             neg+="-"+arr.get(i);
27         if(neg=="")
28             plus=plus.substring(1);//去掉逗号
29         return neg+plus;
30     }
31     
32 }