leetcode实现 “10001”+“1011” 返回二进制相加的结果

https://oj.leetcode.com/problems/add-binary/  
实”

1 public class Solution {
      public String addBinary(String a, String b) {
         char c1[]=a.toCharArray();
         char c2[]=b.toCharArray();
         int len1=a.length();
         int len2=b.length();
         int lo=len1;
         if(len1<=len2)
         {
             lo=len2;
         }
         int ans[]=new int[lo+1];
         int k=0;
         int ia=len1-1;
         int ib=len2-1;
         int  jinwei=0;
         while(ia>=0&&ib>=0)
         {
             ans[k]=c1[ia--]-'0'+c2[ib--]-'0'+jinwei;

             jinwei=ans[k]/2;
             ans[k]=ans[k]%2;
             k++;

         }

         while(ia>=0)
         {

             ans[k]=c1[ia--]-'0'+jinwei;
             jinwei=ans[k]/2;
             ans[k]=ans[k]%2;
             k++;

         }
         while(ib>=0)
         {

             ans[k]=c2[ib--]-'0'+jinwei;
             jinwei=ans[k]/2;
             ans[k]=ans[k]%2;
             k++;

         }
         StringBuffer sbf=new StringBuffer();
         if(jinwei==1) sbf.append(1);

        for(int j=lo-1;j>=0;j--)
        {
            sbf.append(ans[j]);

        }

        return sbf.toString();

     }
 }